一.只支持表,非常牛逼的 SELECT a.name,(case when (SELECT count(*) FROM sysobjects WHERE (name in (SELECT name FROM sysindexes WHERE (id = a.id) AND (indid in (SELECT indid FROM sysindexkeys WHERE (id = a.id) AND (colid then ' end) isprimary, b.name [type],COLUM
1. 写法轻松,更新效率高:update table1 set field1=table2.field1,field2=table2.field2from table2where table1.id=table2.id 2. 常规方式,种写法相当于一个 Left join, 以外面的where为更新条数,如果不加where就是所有记录 update table1set field1=(select top 1 field1 from table2 where table2.id=table1.i
1. 写法轻松.更新效率高: update table1 set field1=table2.field1, field2=table2.field2 from table2 where table1.id=table2.id 2. 常规方式,种写法相当于一个 Left join, 以外面的where为更新条数,假设不加where就是全部记录 update table1 set field1=(select top 1 field1 from table2 where table2.id=tab
这是上一个sql更新某表字段的一个延伸,在更新表数据时,实际上会有多表数据查询场景,查询后,只需要更新某一个表中的数据,以下提供两个方法, 第一种使用update 两表查询 update api_manage_apicollectioninfo_copy a, api_manage_apicollectionmanage b set a.header=replace(a.header,'XXXDDD','zhangjun') WHERE a.api_collection_id=b.id and
: insert into b(col1,col2 )select col1,col2 where not exists(select a.col1 from a where a.col1 = b.col1) : INSERT INTO B (COL1, COL2) (SELECT COL1, COL2 FROM A MINUS SELECT COL1, COL2 FROM B) : 使用merge merge into B using A on b.col=a.col --关联字段 when
from django import forms from . import models class UserInfoModelForms(forms.ModelForm): class Meta: model = models.UserInfo fields = "__all__" def __init__(self,*args,**kwargs): super(UserInfoModelForms, self).__init__(*args,**kwargs) for name,
sqlserver: update A a set a.i = b.k from B b where a.key = b.key oracle : update A a set a.i = (select b.k-b.unk from B b where a.key = b,key) where exists(select 1 from B b a.key = b.key)
笔者:iamlasong 要求:表格内容需要改变,在临时表中内容的变化,使用SQL官方声明更新表若干领域. 假设更新一个字段,直接用字段名=子查询就能够了,多个字段更新,将字段在括号里并列写出就可以,例如以下: update tb_jg t set t.jgfl = 'sd', ( t.zj_code, t.zj_mc) = (select a.zj_code, a.zj_mc from so
首先介绍一下 Case ..When...Then..End 的用法: CASEJiXiaoFind_RowID WHEN '1' THENJiXiao_Money1 WHEN '2' THEN JiXiao_Money2 WHEN '3' THEN JiXiao_Money3 WHEN '4' THEN JiXiao_Money4 ELSE JiXiao_Money5 END 举例说明: 上图是一个视图的截图,我想在 表B 中添加一个字段 JiXiao_Money(绩效金额):