Question

我从查询中获取了多个值。

select l_t_id from MLTalukDetails join MLDistrictDetails on MLTalukDetails.L_D_Id=4

它返回13,14,15,16。现在我想一次取下这些值，并从这些值中得到细节，即

select Sc_Id from MSchoolDetails 
where 
MSchoolDetails.L_T_Id=@talukid and 
MSchoolDetails.Y_Id=@yearid

我可以做这个场景。我如何在这里使用for循环语法？

Answer 1

我从你的问题推断这是你真正想要的完整解决方案：

    SELECT MSchoolDetails.* 
      FROM MLTalukDetails
INNER JOIN MSchoolDetails ON MTalukDetails.l_t_id = MSchoolDetails.L_T_Id
     WHERE MLTalukDetails.L_D_ID = 4 AND MSchoolDetails.Y_Id=@yearid

通常一个有一个涉及两个表的连接条件。

我建议reading up加入各种联接。

Answer 2

如果你想使用循环，请使用游标....这是我在存储过程中实现的解决方法....

CREATE PROCEDURE [dbo].[proc_GetSc_Id]
@yearid INT
AS
CREATE TABLE #Sc_Id(Sc_Id varchar(20))
BEGIN       
DECLARE @talukid varchar(20)

    declare c cursor For 
    select l_t_id from MLTalukDetails join MLDistrictDetails on MLTalukDetails.L_D_Id=4

open c
    fetch next from c into @talukid
    while(@@FETCH_STATUS=0)
    BEGIN
        insert into #Sc_Id(Sc_Id) 
            select Sc_Id from MSchoolDetails where MSchoolDetails.L_T_Id=@talukid and MSchoolDetails.Y_Id=@yearid
        fetch next from c into @talukid
    END
    select * from  #Sc_Id;---Here you got your final result.
close c
deallocate c
DROP TABLE #Sc_Id
END

如何在sql server中使用for循环场景

2 个答案: