Question

Lets say I have this:

Declare @passRefID as int
Declare @passTextA as varchar
Deckare @oassTextB as varchar
Declare @passPropertyA as int
Declare @passPropertyB as int


Set @oassTextA = 'Joe'
Set @passTextB = 'Smith'
Set @passPropertyA = 21
Set @passPropertyB = 23

TSQL A:

Set @passRefID = Select Ref_ID from TableA where ID = 10

The Ref_ID returns a value of 50

Now I want to use that value in another select statement which returns any amount of rows.
It looks like this

TSQL B:

Select UserID from TableB where FK_RefID = @passRefID

So lets say it returns:

UserID
34
56
87

Now I want to create an update for TableC based on the UserID that return previously.

My TableC layout of records look like this:

ID,   UserID, PropertyDefinitionID, PropertyValue
265,  34,     21,                    Bob
266,  34,     23,                    Barker
271,  34,     55,                    [e-mail]
628,  56,     21,                    Jane
629,  56,     23,                    Adams
635,  56,     55,                    [e-mail]
901,  83,     21,                    Tom
905,  83,     23,                    Thumb
910,  83,     55,                    [e-mail]

I know I can use:

Update TableC Set PropertyValue = @oassTextA Where UserID = 34 and PropertyDefinitionID = @passPropertyA
Update TableC Set PropertyValue = @oassTextB Where UserID = 34 and PropertyDefinitionID = @passPropertyB
Update TableC Set PropertyValue = @oassTextA Where UserID = 56 and PropertyDefinitionID = @passPropertyA
Update TableC Set PropertyValue = @oassTextB Where UserID = 56 and PropertyDefinitionID = @passPropertyB
Update TableC Set PropertyValue = @oassTextA Where UserID = 83 and PropertyDefinitionID = @passPropertyA
Update TableC Set PropertyValue = @oassTextB Where UserID = 83 and PropertyDefinitionID = @passPropertyB

But my problem is that in TSQL B, those rows returned could differ. There could be 1 row or 100 rows returned and the TableC is constructed a bit different from the norm.

How can I create a dynamic UPDATE statement based on the amount of rows return using the unique USERIDs and the way the TableC uses the PropertyDefinitionID?

Thanks for your assistance.

Answer 1

UPDATE  TableC
SET     PropertyValue = CASE WHEN PropertyDefinitionID = @passPropertyA
                             THEN @oassTextA
                             ELSE @oassTextB
                        END
WHERE   PropertyDefinitionID IN ( @passPropertyA, @passPropertyB )
        AND UserID IN (
        SELECT  B.UserID
        FROM    TableB AS B
                INNER JOIN TableA AS A ON A.Ref_ID = B.FK_RefID
        WHERE   A.Id = 10 )