MySQL 数据库常用操作语句的总结

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 [condition],
  column2 datatype [condition],
  ...
);

5、删除表:

DROP TABLE table_name;

6、插入数据:

INSERT INTO table_name (column1, column2, ...) VALUES (value1, value2, ...);

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、查询数据(无条件):

SELECT * FROM table_name;

11、查询排序:

SELECT * FROM table_name ORDER BY column1 ASC|DESC;

12、查询去重:

SELECT DISTINCT column1 FROM table_name;

13、查询计数:

SELECT COUNT(*) FROM table_name;

14、查询条件:

SELECT * FROM table_name WHERE column1 = value1 AND column2 < value2;

15、模糊查询(通配符 %):

SELECT * FROM table_name WHERE column1 LIKE 'value%';

16、聚合函数(求和、平均值、最大值、最小值):

SELECT SUM(column1), AVG(column2), MAX(column3), MIN(column4) FROM table_name;

17、分组查询:

SELECT column1, COUNT(*) FROM table_name GROUP BY column1;

18、连接表查询(内连接、左连接、右连接、全连接):

SELECT * FROM table1 JOIN table2 ON table1.column = table2.column;

19、创建索引:

CREATE INDEX index_name ON table_name (column1, column2, ...);

20、删除索引:

DROP INDEX index_name ON table_name;

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