澳门金沙vipSQL Server将自己的查询结果作为待查询数据子列之二

  嵌套子查询是SQL语句中相比较常用的一种查询方式,开垦进度中相遇查询须要将协和的某列作为待查询的数码,在参考别人的SQL语句的写法终于达成了和睦供给的职能。

澳门金沙vip,1.  论断a表中有而b表中从不的记录

        不太协考查询语句如下:

select a.* from tbl1 a
left join tbl2 b on a.key = b.key
where b.key is null

        SELECT DISTINCT dbo.a.ProxyID, dbo.a.account AS adminAccount,
dbo.b.LevelName, dbo.a.ProfitProportion, dbo.a.totalUpScore,
dbo.a.score, dbo.a.members, dbo.a.authority, dbo.a.registerDate,
dbo.a.freezeState, temp.belongName

虽说接纳in也能够完毕,不过这种方式的功效越来越高级中学一年级些

FROM dbo.a INNER JOIN dbo.b ON dbo.a.ProxyLevel = dbo.b.LevelId INNER
JOIN (SELECT   dbo.c.BelongsAgent, a.ProxyID, a.account AS belongName
FROM dbo.a AS a INNER JOIN dbo.c ON a.ProxyID = BelongsAgent AND
a.ProxyID = dbo.c.BelongsAgent) AS temp ON dbo.a.belongsAgent =
temp.BelongsAgent

2.  新建二个与有些表同样结构的表

 

select * into b

  精简版的查询语句如下:(省略了a表的一部分不重要字段)

from a where 1<>1

  SELECT DISTINCT dbo.a.BelongAgentId, dbo.a.Account, dbo.b.LevelName,
temp.BelongName  FROM dbo.a INNER JOIN (SELECT a.Account AS BelongName,
a.ProxyId FROM dbo.a AS a INNER JOIN (SELECT BelongAgentId AS id FROM
dbo.a AS a) AS t ON a.ProxyId = t.id) AS temp ON dbo.a.BelongAgentId =
temp.ProxyId INNER JOIN dbo.b ON dbo.a.ProxyLevel = dbo.b.LevelId

3.between的用法,between限制查询数据范围时富含了边界值,not between不饱含

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select * from table1 where time between time1 and time2

select a,b,c, from table1 where a not between 数值1 and 数值2

4. 证实:包括具备在 TableA 中但不在 TableB和TableC 中的行并消除全部重复行而派生出一个结出表

(select a from tableA ) except (select a from tableB) except (select a
from tableC)

5. 最初化表,能够将自增进表的字拉长字段置为1

TRUNCATE TABLE table1

6.多语言设置数据库或然表可能order by的排序准则

         –修改客户数据库的排序法规

ater database dbname collate SQL_Latin1_General_CP1_CI_AS

–修改字段的排序准则

alter table a alter column c2 varchar(50) collate
SQL_Latin1_General_CP1_CI_AS

–按姓氏笔画排序

select * from 表名 order by 列名 Collate Chinese_PRC_Stroke_ci_as

–按拼音首字母排序

select * from 表名 order by 列名 Collate Chinese_PRC_CS_AS_KS_WS

7.列出装有的顾客数据表:

SELECT TOP 100 PERCENT o.name AS 表名

FROM dbo.syscolumns c INNER JOIN

      dbo.sysobjects o ON o.id = c.id AND objectproperty(o.id,
N’IsUserTable’) = 1 AND