下面的附件中,关于case when 、 in 、not in 、exists 、not exists的例子,以及in和exists之间的区别,我也是在网上找的例子,在这里分享一下,用到的时候可以参考一下。
( case when cm.msdp is null then '' else '是' end ) ismsdp from t_gpkcmx cm left join t_ibmes25 bm on cm.heatno = bm.heatno left join b_workshop ws on cm.ccno = ws.workshopcode where cm.status not in (21,54) and exists (select distinct warehouseno from zgzx_basekq ...
@LASTUPDATEID varchar(5), @LASTUPDPGID varchar(7), @SYANAISEQNO varchar(8), @TUKAN_TOKUISAKI varchar(17), @TUKAN_TOKUISAKI_INP varchar(12), @NINUSIKIJI varchar(10), @NINUSISECCD varchar(11), @NINUSIREFNO varchar(15) ; SET @SINKKNO = '43935442710' SET @KYOKAYMD = '20170920' SE...
9、with关键字查询 相当于是sql查询中的sql片段 with score as (SELECT * FROM [ZhaoxiEdu].[dbo].[ScoreInfo]) select * from score where [name] ='张三' 1. 2. 10、子查询 / exists关键字查询 #子查询 SELECT * FROM [ZhaoxiEdu].[dbo].[ScoreInfo] where id in (SELECT Id FROM [ZhaoxiEdu]...
mysql中not exists用法_not exists用法 not exists是sql中的一个语法,常用在子查询和主查询之间,用于条件判断,根据一个条件返回一个布尔值,从而来确定下一步操作如何进行,not exists也是exists或in的对立面。...not exists 是exists的对立面,所以要了解not exists的用法,我们首先了解下exists、in的区别和特点: exis...
我的SQL 语句就像DECLARE @AreaId INT = 2 DECLARE @Areas Table(AreaId int) INSERT INTO @Areas SELECT AreaId FROM AreaMaster WHERE CityZoneId IN (SELECT CityZoneId FROM AreaMaster WHERE AreaId = @AreaID) SELECT * FROM dbo.CompanyMaster WHERE AreaId IN (CASE WHEN EXISTS (SELECT BusinessId...
使用'CASE WHEN EXISTS'更新多行太慢是由于以下原因: 1. 数据量大:如果要更新的数据量很大,'CASE WHEN EXISTS'语句需要逐行判断是否存在符合条件的记录,这会导致更新...
when keycol in (select keycol from tbl_b) then 'matched' else 'unmatched' end as label from tbl_a; 1. 2. 3. 4. – 使用exists的时候: select keycol, case when exists (select * from tbl_b where tbl_a.keycol = tbl_b.keycol) then 'matched' ...
Is there a more optimized way for Polarion SQL to reduce the load on the server without using this complex Exists and Not exists? There are time-outs from the below query, when multiple users are using the server. The below logic works for choosing a system requirement of a partic...
1:第一种语法:case_value必须是一个表达式,例如 userid%2=1或者username is null等。该种语法不能用于测试NULL。 2:第二种语法CASE后面不需要变量或者表达式,直接执行时候评估每一个WHEN后面的条件,如果满足则执行。 案例实战: 表结构如下:a 值为null, b值为1 ...