Sql server 如何将语句放入变量并在存储过程中多次使用

我已经创建了一个存储过程，其中一个case语句将被使用5次，那么有没有办法创建一个SQL变量，以便我可以多次使用该变量？ 我已经创建了一个存储过程，其中一个case语句将被使用5次，那么有没有办法创建一个SQL变量，以便我可以多次使用该变量

@名称\u Level1 varchar（100）=空， @pk_标识_ID varchar（100）=空

AS
开始
声明@JoiningDateChkforRule日期=null 声明@MPHILDateChkforRule date=null 声明@caseVar varchar（最大值）
设置@caseVar='' SET@JoiningDateChkforRule='1991-09-19 00:0:00.000' 设置为“1993-12-31 00:0:00.000”

set @Sql='SELECT Distinct SR.pk_employee_ID ,ISNULL(Last_Name,'''')+ '' ''+ISNULL(First_Name,'''')+'' ''+ISNULL(Middle_Name,'''') AS EmpName,Emp_Code,
TJoiningDateforRuleDesg.JoiningDateforRuleDesg,
-- if main designation and rule designation are same
--Main designation
CASE '+@pk_Designation_ID+' 
WHEN ' +cast(@pk_Designation_IDForRule as varchar) +' THEN 
--******************    
CASE    WHEN DATEDIFF(DAY, TJoiningDateforRuleDesg.JoiningDateforRuleDesg, '+cast(@JoiningDateChkforRule as varchar)+') > 0
    THEN TJoiningDateforRuleDesg.JoiningDateforRuleDesg
    ELSE 
        CASE    WHEN DATEDIFF(day, isnull(NETSETQual.NETSETPassing_Date,MPHILQual.MPHILQualPassing_Date), isnull(MPHILQual.MPHILQualPassing_Date,NETSETQual.NETSETPassing_Date)) >= 0
                THEN 
                    CASE    WHEN DATEDIFF(day, NETSETQual.NETSETPassing_Date, TJoiningDateforRuleDesg.JoiningDateforRuleDesg) <= 0
                            THEN NETSETQual.NETSETPassing_Date
                            ELSE 
                                CASE    WHEN NETSETQual.NETSETPassing_Date IS NULL
                                        THEN 
                                            CASE    WHEN DATEDIFF(DAY, MPHILQual.MPHILQualPassing_Date,'+CAST(@MPHILDateChkforRule as varchar) +')<= 0
                                                    THEN  MPHILQual.MPHILQualPassing_Date 
                                                    ELSE TJoiningDateforRuleDesg.JoiningDateforRuleDesg 
                                            END
                                        ELSE TJoiningDateforRuleDesg.JoiningDateforRuleDesg 
                                END
                    END
                ELSE 
                    CASE    WHEN DATEDIFF(day, MPHILQual.MPHILQualPassing_Date, TJoiningDateforRuleDesg.JoiningDateforRuleDesg) <= 0
                            THEN 
                                CASE    WHEN DATEDIFF(DAY, MPHILQual.MPHILQualPassing_Date,'+CAST(@MPHILDateChkforRule as varchar) +') <= 0
                                        THEN  MPHILQual.MPHILQualPassing_Date 
                                        ELSE TJoiningDateforRuleDesg.JoiningDateforRuleDesg 
                                END
                            ELSE TJoiningDateforRuleDesg.JoiningDateforRuleDesg 
                    END                     
        END
END         
--******************                            
ELSE -- if main designation and rule designation are different
(Select min(Joining_Date) from HRMS_Employee_ServiceRecord  (nolock) 
where fk_Designation_ID in (SELECT * from dbo.Split('''+@pk_Designation_ID+''','','')) 
and  pk_Employee_ID = SR.pk_Employee_ID) 
END as Senority_Joining_For_Order,  
-- Level_1_Designation
CASE '+@Designation_Level1+'
WHEN '+cast(@pk_Designation_IDForRule as varchar) +' THEN 
--******************    
CASE    WHEN DATEDIFF(DAY, TJoiningDateforRuleDesg.JoiningDateforRuleDesg, '+cast(@JoiningDateChkforRule as varchar)+') > 0
    THEN TJoiningDateforRuleDesg.JoiningDateforRuleDesg
    ELSE 
        CASE    WHEN DATEDIFF(day, isnull(NETSETQual.NETSETPassing_Date,MPHILQual.MPHILQualPassing_Date), isnull(MPHILQual.MPHILQualPassing_Date,NETSETQual.NETSETPassing_Date)) >= 0
                THEN 
                    CASE    WHEN DATEDIFF(day, NETSETQual.NETSETPassing_Date, TJoiningDateforRuleDesg.JoiningDateforRuleDesg) <= 0
                            THEN NETSETQual.NETSETPassing_Date
                            ELSE 
                                CASE    WHEN NETSETQual.NETSETPassing_Date IS NULL
                                        THEN 
                                            CASE    WHEN DATEDIFF(DAY, MPHILQual.MPHILQualPassing_Date,'+CAST(@MPHILDateChkforRule as varchar) +')<= 0
                                                    THEN  MPHILQual.MPHILQualPassing_Date 
                                                    ELSE TJoiningDateforRuleDesg.JoiningDateforRuleDesg 
                                            END
                                        ELSE TJoiningDateforRuleDesg.JoiningDateforRuleDesg 
                                END
                    END
                ELSE 
                    CASE    WHEN DATEDIFF(day, MPHILQual.MPHILQualPassing_Date, TJoiningDateforRuleDesg.JoiningDateforRuleDesg) <= 0
                            THEN 
                                CASE    WHEN DATEDIFF(DAY, MPHILQual.MPHILQualPassing_Date,'+CAST(@MPHILDateChkforRule as varchar) +') <= 0
                                        THEN  MPHILQual.MPHILQualPassing_Date 
                                        ELSE TJoiningDateforRuleDesg.JoiningDateforRuleDesg 
                                END
                            ELSE TJoiningDateforRuleDesg.JoiningDateforRuleDesg 
                    END                     
        END
END     

--******************                                
ELSE
(Select min(Joining_Date) from HRMS_Employee_ServiceRecord  (nolock) 
where fk_Designation_ID in (SELECT * from dbo.Split('''+@Designation_Level1+''','','')) 
and  pk_Employee_ID = SR.pk_Employee_ID) 
END as Level_1_Designation
FROM HRMS_EMPLOYEE_SERVICERECORD SR(NOLOCK)
INNER JOIN HRMS_Mst_Employee MstEmp (NOLOCK) ON SR.pk_Employee_ID=MstEmp.pk_Employee_ID AND Sr.IsCurrent_Appointment=''1'' AND Sr.fk_SeparationType_ID is null   AND Sr.Is_Approved=''1''   

INNER JOIN 
(
Select pk_Employee_ID, min(Joining_Date) as JoiningDateforRuleDesg  from HRMS_Employee_ServiceRecord  (nolock) 
where fk_Designation_ID = '+CAST(@pk_Designation_IDForRule as varchar)+'
group by pk_Employee_ID
)TJoiningDateforRuleDesg ON TJoiningDateforRuleDesg.pk_Employee_ID = SR.pk_Employee_ID

LEFT JOIN 
(
Select Distinct RuleEQ.pk_Employee_ID as NETSETpk_Employee_ID, min(RuleEQ.Passing_Date) as NETSETPassing_Date
FROM HRMS_Employee_Qualifications RuleEQ        
WHERE
fk_Course_ID in  (SELECT * from dbo.Split('''+(@NETSETQualification)+''','','')) 
group by RuleEQ.pk_Employee_ID
)NETSETQual ON
NETSETQual.NETSETpk_Employee_ID = SR.pk_Employee_ID

LEFT JOIN 
(
Select Distinct RuleEQ.pk_Employee_ID as MPHILQualpk_Employee_ID, min(RuleEQ.Passing_Date) as MPHILQualPassing_Date
FROM HRMS_Employee_Qualifications RuleEQ        
WHERE 
fk_Course_ID in   (SELECT * from dbo.Split('''+(@MPHILQualification)+''','','')) 
group by RuleEQ.pk_Employee_ID
)MPHILQual ON 
MPHILQual.MPHILQualpk_Employee_ID = SR.pk_Employee_ID   
LEFT JOIN HRMS_Employee_Qualifications RuleEQ ON RuleEQ.pk_Employee_ID = SR.pk_employee_ID
where 
MstEmp.deleted=''0'' and 
SR.Appointment_Type in (''3'' , ''2'') 
and SR.fk_SeparationType_ID is null and
SR.fk_Designation_ID='+ cast(@pk_Designation_IDForRule as varchar)+' AND        
( (TJoiningDateforRuleDesg.JoiningDateforRuleDesg < '+cast(@JoiningDateChkforRule as varchar)+')
        OR
(TJoiningDateforRuleDesg.JoiningDateforRuleDesg >= '+cast(@JoiningDateChkforRule as varchar)+' AND RuleEQ.fk_Course_ID IN (SELECT * from dbo.Split('''+@NETSETQualification+''','',''))) 
        OR
(TJoiningDateforRuleDesg.JoiningDateforRuleDesg >= '+cast(@JoiningDateChkforRule as varchar)+' AND RuleEQ.fk_Course_ID IN (SELECT * from dbo.Split('''+@MPHILQualification+''','','')) )    ) '
-- and ES.pk_CourseBranch_ID in (35) 

end

set@Sql='SELECT Distinct SR.pk_employee_ID，ISNULL（姓氏，''''.''.+''.'''.+ISNULL（名首，'.''.''.''.+'''.+ISNULL（中间名，'.''）作为Emp名称，Emp_代码，
TJoiningDateforRuleDesg.JoiningDateforRuleDesg，
--如果主标志和规则标志相同
--主要名称
案例'+@pk_Designation_ID+'
当“+cast”（@pk_Designation_IDForRule as varchar）+”时，则
--******************    
DATEDIFF（DAY，TJoiningDateforRuleDesg.JoiningDateforRuleDesg，“+cast（@JoiningDateChkforRule as varchar）+”）大于0时的大小写
然后TJoiningDateforRuleDesg.JoiningDateforRuleDesg
其他的
DATEDIFF（day，isnull（NETSETQual.NETSETPassing_Date，mphillqual.mphillqualpassing_Date），isnull（mphillqual.mphillqualpassing_Date，NETSETQual.NETSETPassing_Date））大于等于0时的情况
然后
如果DATEDIFF（day，NETSETQual.NETSETPassing_Date，TJoiningDateforRuleDesg.JoiningDateforRuleDesg）否，则不能将其放入变量中，除非全面使用动态SQL

根据代码的实际外观，您可以使用视图（或函数）或CTE来封装其中的一部分

我宁愿坚持写五遍，并期待更好的表现。
。。。如果我使用的是动态sql，我可以这样做吗？告诉我们到目前为止你有什么。我已经更新了相同的代码，你可以看到--******块之间的部分，正在重复，它将重复到4级