如何在单个sql语句中基于条件分配多个变量

Question

如何根据sql server 2008R2中的条件分配多个变量？我可以通过为每个变量分别访问表来完成，但我想在一个语句中完成。以下是我在单个语句中编写的代码，但CASE表达式只返回单个值。

SELECT 

    @Sun_ST = CASE WHEN (isnull(@Sun_ShiftCode,'') <> '') AND Std.Shift_Code = @Sun_ShiftCode THEN replicate('0',2-len(convert(varchar,Std.Start_Hour))) + convert(varchar,Std.Start_Hour) + replicate('0',2-len(convert(varchar,Std.Start_Minute))) + convert(varchar,Std.Start_Minute) END, 

    @Sun_ET = CASE WHEN (isnull(@Sun_ShiftCode,'') <> '') AND Std.Shift_Code = @Sun_ShiftCode THEN replicate('0',2-len(convert(varchar,Std.End_Hour))) + convert(varchar,Std.End_Hour) + replicate('0',2-len(convert(varchar,Std.End_Minute))) + convert(varchar,Std.End_Minute) END, 

    @Mon_ST = CASE WHEN (isnull(@Mon_ShiftCode,'') <> '') AND Std.Shift_Code = @Mon_ShiftCode THEN replicate('0',2-len(convert(varchar,Std.Start_Hour))) + convert(varchar,Std.Start_Hour) + replicate('0',2-len(convert(varchar,Std.Start_Minute))) + convert(varchar,Std.Start_Minute)END, 

    @Mon_ET = CASE WHEN (isnull(@Mon_ShiftCode,'') <> '') AND Std.Shift_Code = @Mon_ShiftCode THEN replicate('0',2-len(convert(varchar,Std.End_Hour))) + convert(varchar,Std.End_Hour) + replicate('0',2-len(convert(varchar,Std.End_Minute))) + convert(varchar,Std.End_Minute) END, 

    @Tue_ST = CASE WHEN (isnull(@Tue_ShiftCode,'') <> '') AND Std.Shift_Code = @Tue_ShiftCode THEN replicate('0',2-len(convert(varchar,Std.Start_Hour))) + convert(varchar,Std.Start_Hour) + replicate('0',2-len(convert(varchar,Std.Start_Minute))) + convert(varchar,Std.Start_Minute) END, 

    @Tue_ET = CASE WHEN (isnull(@Tue_ShiftCode,'') <> '') AND Std.Shift_Code = @Tue_ShiftCode THEN replicate('0',2-len(convert(varchar,Std.End_Hour))) + convert(varchar,Std.End_Hour) + replicate('0',2-len(convert(varchar,Std.End_Minute))) + convert(varchar,Std.End_Minute) END, 

    @Wed_ST = CASE WHEN (isnull(@Wed_ShiftCode,'') <> '') AND Std.Shift_Code = @Wed_ShiftCode THEN replicate('0',2-len(convert(varchar,Std.Start_Hour))) + convert(varchar,Std.Start_Hour) + replicate('0',2-len(convert(varchar,Std.Start_Minute))) + convert(varchar,Std.Start_Minute) END, 

    @Wed_ET = CASE WHEN (isnull(@Wed_ShiftCode,'') <> '') AND Std.Shift_Code = @Wed_ShiftCode THEN replicate('0',2-len(convert(varchar,Std.End_Hour))) + convert(varchar,Std.End_Hour) + replicate('0',2-len(convert(varchar,Std.End_Minute))) + convert(varchar,Std.End_Minute)END, 

    @Thu_ST = CASE WHEN (isnull(@Thu_ShiftCode,'') <> '') AND Std.Shift_Code = @Thu_ShiftCode THEN replicate('0',2-len(convert(varchar,Std.Start_Hour))) + convert(varchar,Std.Start_Hour) + replicate('0',2-len(convert(varchar,Std.Start_Minute))) + convert(varchar,Std.Start_Minute) END, 

    @Thu_ET = CASE WHEN (isnull(@Thu_ShiftCode,'') <> '') AND Std.Shift_Code = @Thu_ShiftCode THEN replicate('0',2-len(convert(varchar,Std.End_Hour))) + convert(varchar,Std.End_Hour) + replicate('0',2-len(convert(varchar,Std.End_Minute))) + convert(varchar,Std.End_Minute) END, 

    @Fri_ST = CASE WHEN (isnull(@Fri_ShiftCode,'') <> '') AND Std.Shift_Code = @Fri_ShiftCode THEN replicate('0',2-len(convert(varchar,Std.Start_Hour))) + convert(varchar,Std.Start_Hour) + replicate('0',2-len(convert(varchar,Std.Start_Minute))) + convert(varchar,Std.Start_Minute) END, 

    @Fri_ET = CASE WHEN (isnull(@Fri_ShiftCode,'') <> '') AND Std.Shift_Code = @Fri_ShiftCode THEN replicate('0',2-len(convert(varchar,Std.End_Hour))) + convert(varchar,Std.End_Hour) + replicate('0',2-len(convert(varchar,Std.End_Minute))) + convert(varchar,Std.End_Minute) END, 

    @Sat_ST = CASE WHEN (isnull(@Sat_ShiftCode,'') <> '') AND Std.Shift_Code = @Sat_ShiftCode THEN replicate('0',2-len(convert(varchar,Std.Start_Hour))) + convert(varchar,Std.Start_Hour) + replicate('0',2-len(convert(varchar,Std.Start_Minute))) + convert(varchar,Std.Start_Minute) END, 

    @Sat_ET = CASE WHEN (isnull(@Sat_ShiftCode,'') <> '') AND Std.Shift_Code = @Sat_ShiftCode THEN replicate('0',2-len(convert(varchar,Std.End_Hour))) + convert(varchar,Std.End_Hour) + replicate('0',2-len(convert(varchar,Std.End_Minute))) + convert(varchar,Std.End_Minute) END 
FROM dbo.Table Std 
WHERE Std.Country_Code = @Country_Code 

Answer 1

这是你在找什么？

declare @Sun_ShiftCode int=1 
declare @Mon_ShiftCode int=2 
declare @Tue_ShiftCode int=3 
declare @Wed_ShiftCode int=4 
declare @Thu_ShiftCode int=5 
declare @Fri_ShiftCode int=6 
declare @Sat_ShiftCode int=7 


declare @Sun_ST varchar(10); 
declare @Sun_ET varchar(10); 
declare @Mon_ST varchar(10); 
declare @Mon_ET varchar(10); 
declare @Tue_ST varchar(10); 
declare @Tue_ET varchar(10); 
declare @Wed_ST varchar(10); 
declare @Wed_ET varchar(10); 
declare @Thu_ST varchar(10); 
declare @Thu_ET varchar(10); 
declare @Fri_ST varchar(10); 
declare @Fri_ET varchar(10); 
declare @Sat_ST varchar(10); 
declare @Sat_ET varchar(10); 

declare @country_code int=1 

;with Tab as 
(
select 
* 
from 
(values 
(1,'8','0','17','0',1) 
,(2,'8','5','16','50',1) 
,(3,'8','10','16','40',1) 
,(4,'8','15','16','30',1) 
,(5,'8','20','16','20',1) 
,(6,'8','25','16','10',1) 
,(7,'8','30','16','0',1) 
)a(Shift_Code,Start_Hour,Start_Minute,End_Hour,End_Minute,Country_Code) 
) 
select 
@Sun_ST=max(case when Shift_Code=@Sun_ShiftCode then right('00'+Std.Start_Hour,2)+right('00'+Std.Start_Minute,2) else '' end) 
,@Sun_ET=max(case when Shift_Code=@Sun_ShiftCode then right('00'+Std.End_Hour,2) +right('00'+Std.End_Minute,2)  else '' end) 
,@Mon_ST=max(case when Shift_Code=@Mon_ShiftCode then right('00'+Std.Start_Hour,2)+right('00'+Std.Start_Minute,2) else '' end) 
,@Mon_ET=max(case when Shift_Code=@Mon_ShiftCode then right('00'+Std.End_Hour,2) +right('00'+Std.End_Minute,2)  else '' end) 
,@Tue_ST=max(case when Shift_Code=@Tue_ShiftCode then right('00'+Std.Start_Hour,2)+right('00'+Std.Start_Minute,2) else '' end) 
,@Tue_ET=max(case when Shift_Code=@Tue_ShiftCode then right('00'+Std.End_Hour,2) +right('00'+Std.End_Minute,2)  else '' end) 
,@Wed_ST=max(case when Shift_Code=@Wed_ShiftCode then right('00'+Std.Start_Hour,2)+right('00'+Std.Start_Minute,2) else '' end) 
,@Wed_ET=max(case when Shift_Code=@Wed_ShiftCode then right('00'+Std.End_Hour,2) +right('00'+Std.End_Minute,2)  else '' end) 
,@Thu_ST=max(case when Shift_Code=@Thu_ShiftCode then right('00'+Std.Start_Hour,2)+right('00'+Std.Start_Minute,2) else '' end) 
,@Thu_ET=max(case when Shift_Code=@Thu_ShiftCode then right('00'+Std.End_Hour,2) +right('00'+Std.End_Minute,2)  else '' end) 
,@Fri_ST=max(case when Shift_Code=@Fri_ShiftCode then right('00'+Std.Start_Hour,2)+right('00'+Std.Start_Minute,2) else '' end) 
,@Fri_ET=max(case when Shift_Code=@Fri_ShiftCode then right('00'+Std.End_Hour,2) +right('00'+Std.End_Minute,2)  else '' end) 
,@Sat_ST=max(case when Shift_Code=@Sat_ShiftCode then right('00'+Std.Start_Hour,2)+right('00'+Std.Start_Minute,2) else '' end) 
,@Sat_ET=max(case when Shift_Code=@Sat_ShiftCode then right('00'+Std.End_Hour,2) +right('00'+Std.End_Minute,2)  else '' end) 
from tab Std 
WHERE Std.Country_Code = @Country_Code 
and std.Shift_Code is not null 


select @Sun_ST Sun_ST 
, @Sun_ET Sun_ET 
, @Mon_ST Mon_ST 
, @Mon_ET Mon_ET 
, @Tue_ST Tue_ST 
, @Tue_ET Tue_ET 
, @Wed_ST Wed_ST 
, @Wed_ET Wed_ET 
, @Thu_ST Thu_ST 
, @Thu_ET Thu_ET 
, @Fri_ST Fri_ST 
, @Fri_ET Fri_ET 
, @Sat_ST Sat_ST 
, @Sat_ET Sat_ET