What is wrong with this Case statement?

I have function that will return an integer however I need to do some set up before hand.. I'm trying to populate a table variable based on if the paramater passed into the function(@loginID) is null or not.. My Case and my else is being highlighted as invalid syntax.. What is it?
Declare @UserGroup table(UserGroupID int)
 	CASE 
	WHEN @LoginID is not null
	THEN	
	Insert into @UserGroup
		Select UserGroupID from UserGroup_login
		Where LoginID = 103
    ELSE
    Insert into @UserGroup
		Select UserGroupID from UserGroup_login
		Where UserGroupID = @UserGroupID

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cheryl9063Asked:
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knightEknightConnect With a Mentor Commented:
FYI - CASE is useful in SELECT queries like this (for example)

select CASE WHEN @LoginID is not null THEN 103 ELSE @UserGroupID END as myGroupID
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knightEknightCommented:
An "IF" structure is more appropriate here:

Declare @UserGroup table(UserGroupID int)
        IF @LoginID is not null
        Insert into @UserGroup
                Select UserGroupID from UserGroup_login
                Where LoginID = 103
        ELSE
        Insert into @UserGroup
                Select UserGroupID from UserGroup_login
                Where UserGroupID = @UserGroupID

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0
 
SharathConnect With a Mentor Data EngineerCommented:
You can simply try like this.
DECLARE  @UserGroup  TABLE( 
                           UserGroupID INT 
                           ) 

INSERT INTO @UserGroup 
SELECT UserGroupID 
  FROM UserGroup_login 
 WHERE (LoginID = 103 
        AND @LoginID IS NOT NULL) 
        OR (UserGroupID = @UserGroupI 
            AND @LoginID IS NULL)

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