Question

只是想知道，下面的代码不起作用的原因是什么？我尝试更新2个列值，如果它们符合多个条件，但我收到的错误是“＆＃39; IF＆＃39;和＆＃39; Total＆＃39;附近的语法不正确。任何帮助非常感谢！

update  [dbo].[wages table]
IF([criteria1]='AA1' and [criteria2]='50yrs and below' and [criteria3]= 'X<=50') 
set [Total ] = '0', [Employee ]='0' else
if ([criteria1]='AA1' and [criteria2]='50yrs and below' and [criteria3]= 'X<=50') 
set [Total ] = '10', [Employee ]='10' else
if ([criteria1]='AA1' and [criteria2]='50yrs and below' and [criteria3]= 'X<=50') 
set [Total ] = '20', [Employee ]='20' else
if ([criteria1]='AA1' and [criteria2]='50yrs and below' and [criteria3]= 'X<=50') 
set [Total ] = '30', [Employee ]='30' else
set [Total ] = 'NULL', [Employee ]='NULL'

Answer 1

在SQL中，您可以CASE表达此类陈述：

UPDATE  [dbo].[wages table]
SET [Total] = CASE WHEN ([criteria1]='AA1' AND [criteria2]='50yrs and below' AND [criteria3]= 'X<=50')  THEN '0' 
                   WHEN ([criteria1]='AA1' AND [criteria2]='50yrs and below' AND [criteria3]= 'X<=50')  THEN '0' 
                   WHEN ([criteria1]='AA1' AND [criteria2]='50yrs and below' AND [criteria3]= 'X<=50')  THEN '0' 
                   ELSE NULL END,
    [Employee ] = CASE WHEN ([criteria1]='AA1' AND [criteria2]='50yrs and below' AND [criteria3]= 'X<=50')  THEN '0' 
                   WHEN ([criteria1]='AA1' AND [criteria2]='50yrs and below' AND [criteria3]= 'X<=50')  THEN '0' 
                   WHEN ([criteria1]='AA1' AND [criteria2]='50yrs and below' AND [criteria3]= 'X<=50')  THEN '0' 
                   ELSE NULL END

此外，我不能发现你的情况有任何不同。

Answer 2

我想这就是你要做的事情：

UPDATE [dbo].[wages table]
   SET [Total] = CASE [criteria3] WHEN 'X<=50' THEN '0' ELSE 'NULL' END,
   SET [Employee] = CASE [criteria3] WHEN = 'X<=50' THEN '0' ELSE 'NULL' END
WHERE [criteria1]='AA1' and [criteria2]='50yrs and below'

如果criteria1和criteria2对所有人都相同，那么您可以在WHERE子句中查看它。我认为区别在于criteria3。

类似的东西：

UPDATE [dbo].[wages table]
   SET [Total] = CASE [criteria3] WHEN 'X<=50' THEN '0' WHEN 'X<=40' THEN 1 WHEN 'X<=30' THEN 3 ELSE 'NULL' END,
   SET [Employee] = CASE [criteria3] WHEN 'X<=50' THEN '0' WHEN 'X<=40' THEN 1 WHEN 'X<=30' THEN 3 ELSE 'NULL' END
WHERE [criteria1]='AA1' and [criteria2]='50yrs and below'

if else语句与设置条件（SQL）

2 个答案: