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首页Teradata 16.00 SQL查询基础参考指南
Teradata 16.00 SQL查询基础参考指南
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更新于2024-07-18
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"Teradata 16 SQL参考 英文版 Basic Teradata Query Reference-16.00,这是一份基础的Teradata查询参考文档,适用于版本16.00。"
Teradata是全球领先的数据仓库和分析解决方案提供商,其SQL参考文档是数据库管理员、数据分析师和开发人员的重要参考资料。在“Basic Teradata Query Reference-16.00”中,我们可以找到关于如何在Teradata 16环境中编写和执行SQL查询的详细信息。
文档可能涵盖了以下几个关键知识点:
1. **SQL语法基础**:包括SELECT语句的使用,用于从数据库中检索数据。这可能涉及到选择列、排序结果、分组数据以及使用聚合函数(如COUNT, SUM, AVG, MAX, MIN)。
2. **查询操作**:可能包含JOIN操作,如内连接(INNER JOIN)、外连接(LEFT JOIN, RIGHT JOIN, FULL JOIN)和自连接(SELF JOIN),这些是组合多个表数据的关键。
3. **子查询与嵌套查询**:介绍如何在主查询中使用子查询来实现更复杂的逻辑,例如在WHERE子句或FROM子句中使用子查询。
4. **事务处理**:Teradata支持ACID属性的事务,包括原子性、一致性、隔离性和持久性,这对于确保数据的一致性和完整性至关重要。
5. **索引与优化**:文档可能讨论了如何创建和管理索引以提高查询性能,以及使用 Explain Plan 分析查询执行计划来优化查询。
6. **视图与存储过程**:创建视图可以简化复杂的查询,并提供安全性;存储过程则允许将一组SQL语句封装起来,便于重复使用和管理。
7. **安全性与权限管理**:Teradata提供了细粒度的权限控制,允许对用户访问数据库对象进行管理,包括GRANT和REVOKE语句。
8. **日期和时间函数**:处理日期和时间数据是数据库操作中常见的一部分,文档可能会详细解释如何使用相关函数进行计算和转换。
9. **错误处理与调试**:可能涉及如何识别和解决SQL查询中的错误,以及如何使用DEBUG语句进行调试。
10. **Teradata特定的功能**:如Teradata Parallel Transporter (TPT)、快速加载(FASTLOAD)和多载(MULTILoad)等工具,用于高效地导入和导出大量数据。
该文档作为Teradata 16的查询参考,对于理解Teradata SQL的特性和最佳实践至关重要。通过学习这份文档,用户可以更有效地操作Teradata数据库,提升数据处理效率和准确性。
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Usage Notes..........................................................................................................................................278
P
ACK Clause........................................................................................................................................279
REPEAT and = Command Dierences............................................................................................279
Using the REPEAT Command with the COMPILE Command...................................................280
REPEAT Error Handling....................................................................................................................280
Using REPEAT When QUIET is ON................................................................................................280
Running Multiple Sessions With REPEAT.......................................................................................280
REPEATSTOP.............................................................................................................................................283
Purpose.................................................................................................................................................283
Syntax....................................................................................................................................................283
REPORTALIGN..........................................................................................................................................284
Purpose.................................................................................................................................................284
Syntax....................................................................................................................................................284
Usage Notes..........................................................................................................................................284
Aected
Behaviors..............................................................................................................................284
RETCANCEL..............................................................................................................................................287
Purpose.................................................................................................................................................287
Syntax....................................................................................................................................................287
Usage Notes..........................................................................................................................................287
RETLIMIT...................................................................................................................................................289
Purpose.................................................................................................................................................289
Syntax....................................................................................................................................................289
Usage Notes..........................................................................................................................................289
RETRY......................................................................................................................................................... 292
Purpose.................................................................................................................................................292
Syntax....................................................................................................................................................292
Usage Notes..........................................................................................................................................292
RTITLE........................................................................................................................................................ 294
Purpose.................................................................................................................................................294
Syntax....................................................................................................................................................294
Usage Notes..........................................................................................................................................294
Formatting Headings..........................................................................................................................294
Breaking a Line....................................................................................................................................295
Separating a Line into Sections.........................................................................................................295
Blank Title Lines..................................................................................................................................295
Two Apostrophes.................................................................................................................................296
Title String Wider than Page Width..................................................................................................296
Default Headings and Titles...............................................................................................................296
RUN..............................................................................................................................................................298
Purpose.................................................................................................................................................298
Syntax....................................................................................................................................................298
Usage Notes..........................................................................................................................................298
SEPARATOR...............................................................................................................................................300
Purpose.................................................................................................................................................300
Table of Contents
16 Basic Teradata Query Reference, Release 16.00
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Syntax...................................................................................................................................................300
U
sage Notes.........................................................................................................................................300
SESSION CHARSET.................................................................................................................................303
Purpose................................................................................................................................................303
Syntax...................................................................................................................................................303
Usage Notes.........................................................................................................................................303
SESSION RESPBUFLEN..........................................................................................................................307
Purpose................................................................................................................................................307
Syntax...................................................................................................................................................307
Usage Notes.........................................................................................................................................308
SESSION SQLFLAG..................................................................................................................................309
Purpose................................................................................................................................................309
Syntax...................................................................................................................................................309
Usage Notes.........................................................................................................................................309
SESSION TRANSACTION......................................................................................................................310
Purpose................................................................................................................................................310
Syntax...................................................................................................................................................310
Usage Notes.........................................................................................................................................310
SESSION TWORESPBUFS......................................................................................................................312
Purpose................................................................................................................................................312
Syntax...................................................................................................................................................312
Usage Notes.........................................................................................................................................312
SESSIONS...................................................................................................................................................313
Purpose................................................................................................................................................313
Syntax...................................................................................................................................................313
Usage Notes.........................................................................................................................................313
SHOW.........................................................................................................................................................315
Purpose................................................................................................................................................315
Syntax...................................................................................................................................................315
Usage Notes.........................................................................................................................................315
SHOW CONTROLS.................................................................................................................................317
Purpose................................................................................................................................................317
Syntax...................................................................................................................................................317
Usage Notes.........................................................................................................................................317
Reseting Defaults by Logging O....................................................................................................319
S
HOW ERRORMAP................................................................................................................................322
Purpose................................................................................................................................................322
Syntax...................................................................................................................................................322
Usage Notes.........................................................................................................................................322
SHOW VERSIONS................................................................................................................................... 324
Purpose................................................................................................................................................324
Syntax...................................................................................................................................................324
Usage Notes.........................................................................................................................................324
SIDETITLES...............................................................................................................................................326
Table of Contents
Basic Teradata Query Reference, Release 16.00 17
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Purpose.................................................................................................................................................326
S
yntax....................................................................................................................................................326
Usage Notes..........................................................................................................................................326
SKIPDOUBLE.............................................................................................................................................329
Purpose.................................................................................................................................................329
Syntax....................................................................................................................................................329
Usage Notes..........................................................................................................................................329
SKIPLINE....................................................................................................................................................331
Purpose.................................................................................................................................................331
Syntax....................................................................................................................................................331
Usage Notes..........................................................................................................................................331
STATEMENTINDEPENDENCE.............................................................................................................334
Purpose.................................................................................................................................................334
Syntax....................................................................................................................................................334
Usage Notes..........................................................................................................................................334
SUPPRESS...................................................................................................................................................337
Purpose.................................................................................................................................................337
Syntax....................................................................................................................................................337
Usage Notes..........................................................................................................................................337
TDP..............................................................................................................................................................340
Purpose.................................................................................................................................................340
Syntax....................................................................................................................................................340
Usage Notes..........................................................................................................................................340
TIMEMSG...................................................................................................................................................342
Purpose.................................................................................................................................................342
Syntax....................................................................................................................................................342
Usage Notes..........................................................................................................................................342
TITLEDASHES...........................................................................................................................................345
Purpose.................................................................................................................................................345
Syntax....................................................................................................................................................345
Usage Notes..........................................................................................................................................345
TMSMMSG.................................................................................................................................................348
Purpose.................................................................................................................................................348
Syntax....................................................................................................................................................348
Usage Notes..........................................................................................................................................348
TRIMTRAILINGSPACES.........................................................................................................................349
Purpose.................................................................................................................................................349
Syntax....................................................................................................................................................349
Usage Notes..........................................................................................................................................349
TSO...............................................................................................................................................................351
Purpose.................................................................................................................................................351
Syntax....................................................................................................................................................351
Usage Notes..........................................................................................................................................351
UNDERLINE..............................................................................................................................................352
Table of Contents
18 Basic Teradata Query Reference, Release 16.00
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Purpose................................................................................................................................................352
S
yntax...................................................................................................................................................352
Usage Notes.........................................................................................................................................352
WIDTH.......................................................................................................................................................355
Purpose................................................................................................................................................355
Syntax...................................................................................................................................................355
Usage Notes.........................................................................................................................................355
DBS Export Width..............................................................................................................................356
Appendix A:
How to Read Syntax Diagrams...........................................................................................
359
Syntax Diagram Conventions.........................................................................................................................359
Notation Conventions..............................................................................................................................359
Paths............................................................................................................................................................359
Continuation Links............................................................................................................................359
Required Entries........................................................................................................................................360
Optional Entries........................................................................................................................................ 360
Strings.........................................................................................................................................................360
Abbreviations.............................................................................................................................................361
Loops...........................................................................................................................................................361
Excerpts......................................................................................................................................................362
Multiple Legitimate Phrases.....................................................................................................................362
Sample Syntax Diagram............................................................................................................................363
Diagram Identier.....................................................................................................................................363
Appendix B:
Sample Workforce Database Tables.............................................................................
365
Sample Workforce Database Tables...............................................................................................................365
Table DDLs........................................................................................................................................................365
DDL for the Employee Table....................................................................................................................365
DDL for the Department Table...............................................................................................................366
DDL for the Project Table........................................................................................................................366
DDL for the Charges Table.......................................................................................................................367
Table Contents..................................................................................................................................................368
Appendix C:
Kanji, Chinese, Korean, Unicode Character Set Support..........................
371
Table of Contents
Basic Teradata Query Reference, Release 16.00 19
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Kanji, Chinese, Korean, Unicode Character Set Support.............................................................................371
K
anji Character Sets..........................................................................................................................................371
Mainframe-Attached Systems...................................................................................................................371
Workstation-Attached Systems.................................................................................................................371
Establishing the Kanji Character Set........................................................................................................371
Description of the Kanji Character Set....................................................................................................372
SESSION CHARSET Command.....................................................................................................................373
Syntax...........................................................................................................................................................373
GRAPHIC, VARGRAPHIC and LONG VARGRAPHIC.............................................................................373
Chinese and Korean Character Sets................................................................................................................374
Rules for Chinese and Korean Character Sets........................................................................................375
SHOW TABLE Command.................................................................................................................375
Maximum String Length....................................................................................................................375
Unicode Character Sets.....................................................................................................................................375
Rules for Unicode Character Sets.............................................................................................................375
Workstation-Attached Systems.........................................................................................................375
Mainframe-Attached Systems............................................................................................................376
Appendix D:
Using BTEQWIN...................................................................................................................................
377
What is BTEQWIN?..........................................................................................................................................377
BTEQWIN Main Window................................................................................................................................377
BTEQWIN Menus.............................................................................................................................................378
Sessions Menu.............................................................................................................................................378
Edit Menu....................................................................................................................................................379
View Menu...................................................................................................................................................379
Window Menu.............................................................................................................................................380
Help Menu...................................................................................................................................................380
Displaying Multibyte Characters.....................................................................................................................380
Table of Contents
20 Basic Teradata Query Reference, Release 16.00
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