Get Parameter as Column Name in SQL Function [duplicate] - sql-server

Question

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SQL Server dynamic PIVOT query?
(9 answers)
Closed 3 years ago.
I wrote a function that will be passed 1 string parameter. Inside that function it is supposed to get that string as you can see but its not working because parameter I transfer is string. The receiver of parameter suppose to get column name if I write column name as its format it works fine but I need to get passed.
This is the string I pass:
[Where], [University], [BeginDate], [GraduateDate], [Major]
Now this is function
DROP FUNCTION NewTable
GO
CREATE FUNCTION NewTable
(#PassParameter NVARCHAR(MAX))
RETURNS TABLE
AS
RETURN
SELECT *
FROM
(SELECT O.RowIndex, O.OptionValue, T.TypeValue
FROM Options O
LEFT OUTER JOIN Types T ON T.TypeID = O.TypeID
GROUP BY O.RowIndex, O.OptionValue, T.TypeValue) d
PIVOT
(
MAX(OptionValue)
FOR [TypeValue] IN (#PassParameter) <-- this is tricky part this will not work but I put this [Where], [University], [BeginDate], [GraduateDate], [Major] this is gonna work
) PIV
GO
Also I can't use a stored procedure because using a function is my requirement.

Answer 1

You cannot have dynamic sql within a user defined function. If you want to have this kind of functionality, you can define a CLR user defined function.
Instead, You can define a stored procedure with dynamic sql and INSERT the output of stored procedure into the tabletype.
I have given sample for your reference.
First defined a user defined table type
CREATE TYPE RowIndex as
Table
(
RowIndex INT,
optionValue VARCHAR(20),
TypeValue VARCHAR(20)
);
Next define stored procedure with dynamic sql content.
CREATE PROCEDURE NewTable
(#PassParameter NVARCHAR(MAX))
AS
BEGIN
DECLARE #sql NVARCHAR(MAX);
SET #sql =
'
SELECT *
FROM
(SELECT O.RowIndex, O.OptionValue, T.TypeValue
FROM Options O
LEFT OUTER JOIN Types T ON T.TypeID = O.TypeID
GROUP BY O.RowIndex, O.OptionValue, T.TypeValue) d
PIVOT
(
MAX(OptionValue)
FOR [TypeValue] IN '+ #PassParameter +'
) PIV
'
EXEC sp_Executesql #sql
END
GO
Now, Insert the output of the stored procedure into the table type.
DECLARE #RowIndex RowIndex
INSERT INTO #RowIndex
EXEC NewTable 'Test'
SELECT * FROM #RowIndex