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9.1

Case Statement in T-SQL

Asked by NigelRocks in Visual Basic Programming, SQL Query Syntax

Tags: T-SQL

Experts,

In the attached code I'm trying to use a case statement to set the value of @DatabaseName based on @ClientID.  So far, every way I've tried it gives me compile errors.  How do I do it? 
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DECLARE @ClientID int
DECLARE @ExecuteThis VARCHAR(MAX)
DECLARE @DatabaseName VARCHAR(100)
 
SET @ClientID=2
 
 
CASE 
	WHEN @ClientID=2 THEN
		SET @DatabaseName='CCS_Emblem'
 
	WHEN @ClientID=3 THEN
		SET @DatabaseName='CCS_BCN'
 
	WHEN @ClientID=75 THEN 
		SET @DatabaseName='CCS_MOLINA'	
 
	WHEN @ClientID=101 THEN 
		SET @DatabaseName='CCS_SHP'		
 
END
 
SET @ExecuteThis = 
'INSERT INTO AggregateTask 
	( 
	ClientID, 
	ClientName, 
	TaskID, 
	TaskDescription, 
	MemberID, 
	MemberFirstName, 
	MemberLastName,		
	AssessmentCenterID, 
	AssessmentCenterName, 
	MedicalGroup, 
	SNP, 
	ScheduledDate, 
	CreationDate, 
	CreatedByAgentID, 
	,CreatedByAgentFirstName
	,CreatedByAgentLastName
	Lock, 
	LockingAgent, 
	Active
	,PopulationTaskID
	)
SELECT 
	C.ClientID,		
	C.Name,
	PT.TaskID, 
	T.Description,
	PT.MemberID,
	M.FirstName,
	M.LastName,
	PT.AssessmentCenterID,
	AC.Name,
	GroupDetailDerived.DetailName,   --Medical group  
	SNPDerived.SNPValue, --SNP, 
	PT.Priority,
	PT.PriorityDesc,
	PT.ScheduledDate,
	PT.CreationDate,
	PT.CompletedByAgent
	,A.FirstName 
	,A.LastName 
	0, -- Lock
	NULL, --LockingAgent,
	PT.Active -- Active
	,PT.PopulationTaskID
FROM 
	' + @DatabaseName + '.DBO.PopulationTask PT
	INNER JOIN ' + @DatabaseName + '.DBO.Member M on PT.MemberID = M.MemberID
	INNER JOIN ' + @DatabaseName + '.DBO.Client C on M.ClientID = C.ClientID 
	INNER JOIN ' + @DatabaseName + '.DBO.AssessmentCenter AC on PT.AssessmentCenterID = AC.AssessmentCenterID and M.ClientID = AC.ClientID
	INNER JOIN ' + @DatabaseName + '.DBO.Task T on PT.TaskID = T.TaskID 
	INNER JOIN ' + @DatabaseName + '.DBO.Agent A ON A.AgentID=PT.CreatedByAgent 
	INNER JOIN (
		SELECT m.memberID,gd.DetailName FROM ' + @DatabaseName + '.DBO.Member m 
		INNER JOIN ' + @DatabaseName + '.DBO.GroupDetailMember gdm ON gdm.MemberID=m.MemberID AND gdm.GroupDetailID IN 
		(1,2,3,4,5) 
		INNER JOIN ' + @DatabaseName + '.DBO.GroupDetail gd ON gd.GroupDetailID=gdm.GroupDetailID
			) As GroupDetailDerived 
	ON GroupDetailDerived.memberID=m.memberID
	INNER JOIN 
		(
		SELECT m.memberID,1 as SNPValue FROM ' + @DatabaseName + '.DBO.Member m 
		INNER JOIN ' + @DatabaseName + '.DBO.GroupDetailMember gdm ON gdm.MemberID=m.MemberID AND gdm.GroupDetailID IN 
		(1,2,3,4,5) 
		INNER JOIN ' + @DatabaseName + '.DBO.GroupDetail gd ON gd.GroupDetailID=gdm.GroupDetailID
		) As SNPDerived 
	ON SNPDerived.MemberID=m.MemberID
	WHERE PT.Active=1 
	AND m.Active=1 '
	--AND DateDiff(d,PT.CreationDate,GetDate)= 0 '
 
EXEC (@ExecuteThis)
[+][-]10/22/09 03:03 PM, ID: 25639523Expert Comment

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[+][-]10/22/09 03:05 PM, ID: 25639543Author Comment

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[+][-]10/22/09 03:14 PM, ID: 25639595Accepted Solution

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About this solution

Zones: Visual Basic Programming, SQL Query Syntax
Tags: T-SQL
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Solution Provided By: aneeshattingal
Participating Experts: 2
Solution Grade: A
 
[+][-]10/22/09 03:15 PM, ID: 25639605Author Comment

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[+][-]10/22/09 11:36 PM, ID: 25641749Assisted Solution

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