mysql功能语句模板
时间: 2023-12-29 15:05:01 浏览: 26
以下是 MySQL 中常用的功能语句模板:
1. 创建数据库:
CREATE DATABASE database_name;
2. 删除数据库:
DROP DATABASE database_name;
3. 选择数据库:
USE database_name;
4. 创建表:
CREATE TABLE table_name (
column1 datatype,
column2 datatype,
column3 datatype,
.....
);
5. 删除表:
DROP TABLE table_name;
6. 插入数据:
INSERT INTO table_name (column1, column2, column3, ...) VALUES (value1, value2, value3, ...);
7. 更新数据:
UPDATE table_name SET column1 = value1, column2 = value2, ... WHERE condition;
8. 删除数据:
DELETE FROM table_name WHERE condition;
9. 查询数据:
SELECT column1, column2, ... FROM table_name WHERE condition;
10. 排序:
SELECT column1, column2, ... FROM table_name ORDER BY column1 ASC|DESC, column2 ASC|DESC, ...;
11. 分组:
SELECT column1, COUNT(column2) FROM table_name GROUP BY column1;
12. 连接:
SELECT table1.column1, table2.column2 FROM table1 JOIN table2 ON table1.common_column = table2.common_column;
13. 子查询:
SELECT column1 FROM table1 WHERE column2 = (SELECT column2 FROM table2 WHERE condition);
14. 聚合函数:
SELECT COUNT(column1), AVG(column2), SUM(column3) FROM table_name;
15. 索引:
CREATE INDEX index_name ON table_name (column1, column2, ...);