sql语句嵌套更新
sql语句嵌套更新
update b
set b.unitename='套'
from a,b
where a.id=b.id
and a.typeid=13
sql语句update语句中嵌套的子查询该怎么写?
UPDATE ccms_case_allot_count SET
org_code = BCTL.brno
,collector_name = INF.tlrno
FROM ccms_case_allot_count CO
LEFT JOIN sys_tlr_info INF ON CO.collector = inf.tlr_name
LEFT JOIN sys_bctl BCTL ON INF.brcode = BCTL.brcode
SQL 语句 UPDATE带嵌套子查询的问题
create table AAA( mc varchar(10), s1 int )
insert AAA values('A','997')
insert AAA values('B','1234')
create table BBB( mc varchar(10), s1 int )
insert BBB values('A','105')
insert BBB values('A','213')
insert BBB values('B','116')
insert BBB values('B','211')
insert BBB values('B','303')
-- 更新A表里S1值 ,A表里S1值-去B表里值
-- ? B表里S1值之合?
update AAA set
s1 = s1 - isnul((select sum(s1) from BBB where BBB.mc=AAA.mc),0)
-- next for M$SQL:
update AAA set
s1 = s1 - B.s1
from AAA
join (select mc, sum(s1) as s1 from BBB group by mc) B
on B.mc = AAA.mc
SQL中 update嵌套select怎么使用?
UPDATE A SET 时间 = ( SELECT MAX(时间) FROM B WHERE A.ID = B.ID )
求SQL语句 UPDATE嵌套select
UPDATE fastmanowner.FSys_FlowDef SET sFlowClass = '项目审批' WHERE sFlowClass != '项目审批'
标准SQL嵌套查询语句
在一个SELECT 语句的WHERE 子句或HAVING 子句中嵌套另一个SELECT 语句的查询称为嵌套查询,又称子查询。子查询是SQL 语句的扩展,例如下:
select * from table1 where xh in
(select xh from table2)
sql语句嵌套太深怎么修改
最外层的SQL SELECT语句里面的条件,你不要全部套进去,应该先把条件查出来,然后组建最外层SQL语句。简单来说,就是将里面的SELECT语句查出来的结果保存到变量中,然后再来将条件整合,组成最外层SQL语句。LEFT,它并不是加快查询速度,它只不过加快结果集返回的速度。实际上,你并不能感觉到这速度的提高。不过我们还是建议,当你查询很长字符串时(比如说记录的标题)在页面中显示,可以使用LEFT在SQL服务端进行字符截取。
sql 更新(update)语句嵌套问题
update [Membership] set Password=@password where Membership.UserId = (select Users.UserId from Users where UserName=@username)
将[Users]改为Users
请问SQL语句只可以进行一层嵌套吗?我想实现两层或以上的嵌套语句,但是嵌套后只符合其中一个嵌套条件
可以多个嵌套,但是只要一个条件不满足结果都查询不到,你把语句写出来看下
Update Table Set a='5' Where b=
(Select b
From Table
Where c In (Select c
From Dmpedi.Pps_Temp
Where b = '2'
And Rownum < 5)
And Rownum = 1)
sql中delete嵌套的问题
delete from posts_99 where authorid in (select authorid from posts_99 group by authorid having count(message)<3)
中select authorid from posts_99 group by authorid having count(message)<3
查询条件中没有count(message),所以having条件不成立。
select authorid,count(message) from posts_99 group by authorid having count(message)<3 这样的查询才成立,但在delete语句中不适用。
用两步来解决
1。将查询结果放到一个临时表中
select authorid,count(message) SL into #a from posts_99 group by authorid having count(message)<3
2.关联临时表做delete
delete from posts_99 where authorid in (select authorid from #a)
sql语句嵌套更新:等您坐沙发呢!