常用mysql语句记录

1,查询不重复字段总数

SELECT COUNT(*) FROM (SELECT DISTINCT station FROM stopname)AS a

2,将不重复值存入新表

INSERT INTO stopname_uni SELECT * FROM stopname GROUP BY station

3，日期格式化

SELECT id,`name` FROM user WHERE DATE_FORMAT(createtime,'%Y%m')>=201306

4,查询表字段，描述等表信息

SELECT * FROM information_schema.`COLUMNS`

WHERE TABLE_NAME='test';

SELECT COLUMN_NAME,COLUMN_COMMENT FROM information_schema.`COLUMNS`

WHERE TABLE_NAME='test';