查询表名 SELECT tablename FROM pg_tables WHERE tablename NOT LIKE 'pg%' AND tablename NOT LIKE 'sql_%' ORDER BY tablename; 或者 select tablename from pg_tables where schemaname='public' 查询表结构 select col.table_schema, col.table_name, col.ordinal_position, c
select (select relname from pg_class where oid=a.attrelid) relname , () as comment from pg_class where oid=a.attrelid) as table_name, a.attname as column_name, format_type(a.atttypid,a.atttypmod) as data_type, ( end)data_length, ( then 'Y' else 'N' e
--查询表结构start SELECT 序号 = a.colorder,字段名称 = a.name,字段描述 = f.value, 标识 then '√' else '' end, 主键 FROM sysobjects where xtype = 'PK' and parent_obj = a.id and name in ( SELECT name FROM sysindexes WHERE indid in( SELECT indid FROM sysindexkeys WHERE id =
在我们使用SQL数据库的过程中,经常会遇到查询表结构的情况,以下就是sql语句的写法: --查询非系统数据库 SELECT name FROM Master..SysDatabases 查询数据库下所有表 SELECT name FROM sysobjects WHERE xtype = 'U' OR xtype = 'S' 查询所有用户表 SELECT name FROM sysobjects WHERE xtype = 'U' 查询表的相关信息(字段名.长度.类型.字段说明) SELECT
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 ,
背景 有一次需要查询Oracle数据库中的所有表接口并且导出excel,方法记录如下 使用 使用PLSQL工具查询表结构,SQL语句如下 SELECT B.TABLE_NAME AS '表名', C.COMMENTS AS '表说明', B.COLUMN_ID AS '字段序号', B.COLUMN_NAME AS '字段名', B.DATA_TYPE AS '字段数据类型', B.DATA_LENGTH AS '数据长度', B.DATA_PRECISION AS '整数位', B.DATA_
[group by] 对结果集进行分组,常与汇总函数一起使用. SELECT column,SUM(column) FROM table GROUP BY column HAVING 通常与 GROUP BY 子句同时使用.不使用 GROUP BY 时, HAVING 则与 WHERE 子句功能相似. Company Amount W3Schools 5500 IBM
SQL2000系统表的应用 –1:获取当前数据库中的所有用户表 select Name from sysobjects where xtype=’u’ and status>=0 –2:获取某一个表的所有字段 select name from syscolumns where id=object_id(‘表名’) –3:查看与某一个表相关的视图.存储过程.函数 select a.* from sysobjects a, syscomments b where a.id = b.id and