SQLServer中查询表结构(表主键 .列说明.列数据类型.所有表名)的Sql语句 1.查询数据库中的所有表名称: SELECT name FROM SysObjects Where XType='U' ORDER BY Name 结果: 2.查询数据库中指定表的表结构: --快速查看表结构 THEN obj.name ELSE '' END AS 表名, col.colorder AS 序号 , col.name AS 列名 , ISNULL(ep.[value], '') AS 列说明 ,
查询所有数据库占用磁盘空间大小的SQL语句: ,),' MB') as data_size, concat(,),'MB') as index_size from information_schema.tables group by TABLE_SCHEMA order by data_length desc; 查询单个库中所有表磁盘占用大小的SQL语句: ,),' MB') as data_size, concat(,),' MB') as index_size from informatio
SQL> select t1.* from t1,t2 where t1.object_id=t2.object_id; rows selected. Execution Plan ---------------------------------------------------------- -------------------------------------------------------------------------------- ------- | Id | Oper
SQL> select * from employees d, departments t where d.department_id=t.department_id; rows selected. Execution Plan ---------------------------------------------------------- ----------------------------------------------------------------------------
说明: MBGL_GZJH jh_id 对应 mbgl_gzjh_fkmx jh_id mbgl_gzjh_fkmx jh_id 有重复多条,但是 FKRQ 不一样,我们去 FKRQ 最新的一条. select * FROM MBGL_GZJH A LEFT JOIN (select BC.* from (select max(FKRQ) as maxrq,JH_ID from mbgl_gzjh_fkmx GROUP BY JH_ID ) AC LEFT JOIN mbgl_gzjh_fkmx