MySQL中有drop between and吗
时间: 2024-01-09 13:05:28 浏览: 26
不好意思,MySQL中没有drop between and语法。DROP语句用于删除数据库、表或索引,语法为:
```
DROP DATABASE database_name;
DROP TABLE table_name;
DROP INDEX index_name ON table_name;
```
其中,DROP TABLE语句可以使用WHERE子句指定要删除的行,但不能使用BETWEEN和AND来指定范围。如果要删除指定范围的行,可以使用DELETE语句。例如:
```
DELETE FROM table_name WHERE column_name BETWEEN value1 AND value2;
```
相关问题
mysql cte写法
MySQL不支持CTE(公共表表达式)写法,但是可以使用子查询或者临时表来实现类似的功能。
子查询写法:
```
SELECT *
FROM (
SELECT col1, col2, ROW_NUMBER() OVER (ORDER BY col1) as row_num
FROM table1
WHERE col1 > 100
) t
WHERE t.row_num BETWEEN 10 AND 20;
```
临时表写法:
```
CREATE TEMPORARY TABLE temp_table
SELECT col1, col2
FROM table1
WHERE col1 > 100;
SELECT *
FROM (
SELECT col1, col2, ROW_NUMBER() OVER (ORDER BY col1) as row_num
FROM temp_table
) t
WHERE t.row_num BETWEEN 10 AND 20;
DROP TEMPORARY TABLE temp_table;
```
mysql表名命名规则
MySQL表名的命名规则如下:
1. 表名必须以字母开头,可以包含字母、数字和下划线(_);
2. 表名不区分大小写,在不同的操作系统上,表名的大小写会被自动转换;
3. 表名不能使用MySQL保留字;
4. 表名长度不能超过64个字符。
以下是一些常用的MySQL保留字:
| ADD | ALL | ALTER | AND | AS | ASC |
| --- | --- | ----- | --- | -- | --- |
| BETWEEN | BY | CASE | COLLATE | COLUMN | CONSTRAINT |
| CREATE | DATABASE | DEFAULT | DELETE | DESC | DISTINCT |
| DROP | ELSE | END | ESCAPE | EXISTS | FALSE |
| FOR | FOREIGN | FROM | GROUP | HAVING | IF |
| IN | INDEX | INNER | INSERT | INTO | IS |
| JOIN | KEY | LEFT | LIKE | LIMIT | MATCH |
| NOT | NULL | ON | OR | ORDER | OUTER |
| PRIMARY | REFERENCES | RIGHT | SELECT | SET | TABLE |
| THEN | TRUE | UNION | UNIQUE | UPDATE | USING |
| VALUES | WHEN | WHERE |
如果需要使用MySQL保留字作为表名,可以在表名前添加反引号(`)进行转义。例如:`select`。