Question

我在此SQL Server查询中使用IF语句时遇到问题。

我想要的是什么：

SELECT *

  IF(ProgramId = NULL AND BranchId = NULL AND OrganizationId = NULL) {
     --EXECUTE QUERY ONLY ON THIS CONDITION
  }
  ELSE IF(ProgramId = 68 AND BranchId = 78 AND OrganizationId = 2) {
     --EXECUTE QUERY ONLY ON THIS CONDITION
  }
  ELSE {
     --EXECUTE QUERY ONLY ON THIS CONDITION
  }
FROM 
   [dbo].[UserMenu]

这是我的C＃代码逻辑，请你把它转移到SQL

if (organization == null && program == null && branch == null)
{
    /*retrieve usermenu table data*/
}
else if (organization == null && program == null && branch != null)
{
    /*retrieve usermenu table data*/
}
else if (organization == null && program != null && branch != null)
{
    /*retrieve usermenu table data*/
}
else if (organization == null && program != null && branch == null)
{
    /*retrieve usermenu table data*/
}
else if (organization != null && program != null && branch != null)
{
    /*retrieve usermenu table data*/
}
else if (organization != null && program == null && branch == null)
{
    /*retrieve usermenu table data*/
}
else if (organization != null && program == null && branch != null)
{
    /*retrieve usermenu table data*/
}
else if (organization != null && program != null && branch == null)
{
    /*retrieve usermenu table data*/
}

请帮我解决一下。

感谢您的帮助

Answer 1

如果我理解你的问题，你应该做这样的事情

Declare @Programid int,
Declare @BranchId int,
Declare @OrganizationId int

SELECT @Programid=ProgramId, @BranchId=BranchId,@OrganizationId = OrganizationId
             FROM [dbo].[UserMenu] 

  IF (@ProgramId=NULL AND @BranchId=NULL AND @OrganizationId=NULL)

 BEGIN

 /* your if condition code goes here*/
 END

ELSE IF(@ProgramId=68 AND @BranchId=78 AND @OrganizationId=2)

 BEGIN
  /* your else if condition code goes here*/
 END

ELSE 

 BEGIN
  /* your else condition code goes here*/
 END

Answer 2

我认为您希望按照这些条件对结果进行排序，如果有几个条件匹配，那么只需先选择匹配。如果是这样，你就可以这样做：

create table t(ID int, A int, B int)

insert into t values
(1, 1, 1),
(1, 1, null),
(1, null, null),
(2, 2, 1)


select ID, A, B from (select *,
row_number() over (partition by ID order by 
case when A = 1 and B =1 then 1 
 when A = 1 and B is null then 2
 when A is null and B is null then 3 
else 4 end )as rn
from t
)t where rn = 1

输出：

ID  A   B
1   1   1
2   2   1

Fiddle

<强> EDIT1

编辑问题后，我将问题理解为：将变量传递给存储过程或您使用的任何内容：

Declare @ProgramID int,
Declare @BranchID int,
Declare @OrganizationID int


SELECT *
FROM [dbo].[UserMenu]
WHERE (ProgramID = @ProgramID OR @ProgramID IS NULL) AND 
(BranchID = @BranchID OR @BranchID IS NULL) AND 
(OrganizationID = @OrganizationID OR @OrganizationID IS NULL)

此SQL Server查询中的IF语句

2 个答案: