① mssql,if update()语句后,只修改某行的数据
createtrigger触发器名称on表A
forupdate
as
begin
ifupdate(b)
begin
updatet
sett.a=i.b
from表Aast
innerjoininsertedasiont.主键=i.主键
end
end
② SQL语言,DECLARE和IF语句出错,求修改
IF EXISTS (SELECT NAME FROM SYSOBJECTS WHERE XTYPE = 'TR' AND NAME = 'sg') DROP TRIGGER sg GO CREATE TRIGGER sg ON BankCard FOR INSERT AS BEGIN TRANSACTION DECLARE @CardID char(10) DECLARE @TradeMoney MONEY DECLARE @TradeType char(2) UPDATE Trade SET @CardID = (SELECT CardID FROM INSERTED) SET @TradeMoney = (SELECT TradeMoney FROM INSERTED) SET @TradeType = (SELECT TradeType FROM INSERTED) IF (@TradeType LIKE '存钱') BEGIN UPDATE BankCard SET Deposit = (Deposit + @TradeMoney) WHERE CardID = @CardID END ELSE BEGIN UPDATE BankCard SET Payout = (Payout + @TradeMoney) WHERE CardID = @CardID END
③ sql if语句具体怎么写.
图片代码看不清。我写下我知道的IF语句。 If A = Y Or(And) B = Y Or(And) C = Y
Begin D = Y End
是写OR还是AND那得看你自己的情况。
④ SQL if语句
if rs1("newprice").eof then ----总觉得这个rs1("newprice").eof挺别扭的。
rs1("newprice")=30
else
rs1("newprice")=rs1("newprice")+1
end if
试一下将then后的内容换行。
⑤ sql语句查出的数据为空,怎么用个if语句判断,然后作出处理
可以实现,以sql server为例看:
if not exists(select userName from food join diningcar on food.foodId=diningcar.foodId join users on diningcar.userId=users.userId where (comment=0 or comment=-1) and userName='zq' group by userName)
select 0,'zq'
else
select sum(price),userName from food join diningcar on food.foodId=diningcar.foodId join users on diningcar.userId=users.userId where (comment=0 or comment=-1) and userName='zq' group by userName
方法二:
select isnull(sum(price),0),userName
from food join diningcar on food.foodId=diningcar.foodId
join users on diningcar.userId=users.userId
where (comment=0 or comment=-1) and userName='zq'
group by userName
不知道是不是你想要的结果,但是我有个疑问,你为什么不在程序里进行判断,而是要让sql语句判断呢?
⑥ ASP和SQL中 语句if not chkipvote.eof then该如何修改
问题可能不在这一句。标准判断是否不存在某记录用if not(chkipvote.eof and chkipvote.bof) then
⑦ mysql 触发器 if 语句update怎么操作
有时候在修改某一个字段的值得时候我们需要根据当前字段的不同状态进行不同处理,
比如对于用户表,我们需要记录下来用户被访问的次数,但访问次数的初始值为 null。
⑧ SQL IF语句更改问题!
update Customer
set Customer_name='张三'
where 条件
--我想把UPDATE改成不执行任何,包含 不执行,不包含 插入 你是不执行什么啊?不执行逗号?还是什么东东?
⑨ sql 语句查出的数据为空,怎么用个if语句判断,然后作出处理。
oracle:改为
select nvl(sum(price),0),userName
from food join diningcar on food.foodId=diningcar.foodId
join users on diningcar.userId=users.userId
where (comment=0 or comment=-1) and userName='zq'
group by userName
sqlserver改为
select isnull(sum(price),0),userName
from food join diningcar on food.foodId=diningcar.foodId
join users on diningcar.userId=users.userId
where (comment=0 or comment=-1) and userName='zq'
group by userName
⑩ SQL中如何使用IF语句
SQL中的if语句与伪代码的写法很相似,即:
IF (条件) then
执行语句体
END IF;
举例:
begin
if 1 > 0 then
dbms_output.put_line('1>0');
end if;
end;