sql語句嵌套更新
update b
set b.unitename='套'
from a,b
where a.id=b.id
and a.typeid=13
sql語句update語句中嵌套的子查詢該怎麼寫?
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 語句 UPDATE帶嵌套子查詢的問題
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表裏S1值 ,A表裏S1值-去B表裏值
-- ? B表裏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怎麼使用?
UPDATE??A?SET?時間?=?(?SELECT?MAX(時間)?FROM?B?WHERE????A.ID?=?B.ID?)
求SQL語句 UPDATE嵌套select
UPDATE??fastmanowner.FSys_FlowDef?SET?sFlowClass?=?'項目審批'??WHERE?sFlowClass??!=?'項目審批'
標準SQL嵌套查詢語句
在一個SELECT 語句的WHERE 子句或HAVING 子句中嵌套另一個SELECT 語句的查詢稱為嵌套查詢,又稱子查詢。子查詢是SQL 語句的擴展,例如下:
select * from table1 where xh in
(select xh from table2)
sql語句嵌套太深怎麼修改
最外層的SQL SELECT語句裏麵的條件,你不要全部套進去,應該先把條件查出來,然後組建最外層SQL語句。簡單來說,就是將裏麵的SELECT語句查出來的結果保存到變量中,然後再來將條件整合,組成最外層SQL語句。LEFT,它並不是加快查詢速度,它隻不過加快結果集返回的速度。實際上,你並不能感覺到這速度的提高。不過我們還是建議,當你查詢很長字符串時(比如說記錄的標題)在頁麵中顯示,可以使用LEFT在SQL服務端進行字符截取。
sql 更新(update)語句嵌套問題
update [Membership] set Password=@password where Membership.UserId = (select Users.UserId from Users where UserName=@username)
將[Users]改為Users
請問SQL語句隻可以進行一層嵌套嗎?我想實現兩層或以上的嵌套語句,但是嵌套後隻符合其中一個嵌套條件
可以多個嵌套,但是隻要一個條件不滿足結果都查詢不到,你把語句寫出來看下
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 <>
And Rownum = 1)
sql中delete嵌套的問題
delete from posts_99 where authorid in (select authorid from posts_99 group by authorid having count(message)<>
中select authorid from posts_99 group by authorid having count(message)<>
查詢條件中沒有count(message),所以having條件不成立。
select authorid,count(message) from posts_99 group by authorid having count(message)<3>3>
用兩步來解決
1。將查詢結果放到一個臨時表中
select authorid,count(message) SL into #a from posts_99 group by authorid having count(message)<>
2.關聯臨時表做delete
delete from posts_99 where authorid in (select authorid from #a)