SQL Server 2008 - How do i return a User-Defined Table Type from a Table-Valued Function?
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Here's my user-defined table type...
CREATE TYPE [dbo].[FooType] AS TABLE( [Bar] [INT], )
This is what ive had to do in my table-valued function to return the type:
CREATE FUNCTION [dbo].[GetFoos] RETURN @FooTypes TABLE ([Bar] [INT]) INSERT INTO @FooTypes (1) RETURN
Basically, im having to re-declare my type definition in the RETURN statement of the function. Isnt there a way i can simply declare the type in the RETURN statement?
I would have thought this would work:
CREATE FUNCTION [dbo].[GetFoos] RETURN @FooTypes [FooType] INSERT INTO @FooTypes (1) RETURN
Cannot find any help on MSDN/Google regarding this....anyone?
I unmarked my answer, and bumping this question - as i am encountering the same scenario 6 months later.
Does anyone have any idea if it's possible to return a user defined table type from a table valued function? If not, is there a better workaround other than what i have done? (re-declare the type again).
Even though you can not return the UDTT from a function, you can return a table variable and receive it in a UDTT as long as the schema match. The following code is tested in SQL Server 2008 R2
-- Create the UDTT
CREATE TYPE dbo.MyCustomUDDT AS TABLE ( FieldOne varchar (512), FieldTwo varchar(1024) )
-- Declare your variables
DECLARE @uddt MyCustomUDDT; DECLARE @Modifieduddt MyCustomUDDT;
// Call the function
INSERT INTO @Modifieduddt SELECT * FROM dbo.MyUDF(@uddt);
CREATE FUNCTION dbo.MyUDF(@localUDDT MyCustomUDDT) RETURNS @tableVar TABLE ( FieldOne varchar (512), FieldTwo varchar(1024) ) AS BEGIN --Modify your variable here RETURN END
Hopefully this will help somebody.
SQL Server Table-Valued Function By Practical Examples, The return type of a table-valued function is a table, therefore, you can use the The syntax is similar to the one that creates a user-defined function. A table-valued function is a user-defined function that returns data of a table type. The return type of a table-valued function is a table, therefore, you can use the table-valued function just like you would use a table. Creating a table-valued function. The following statement example creates a table-valued function that returns a list of
Ok - so it cant be done.
Easy enough to duplicate the table definition in the return type (with the use of scripting).
Still - hopefully this issue gets rectified in the next version of SQL Server.
Returning a User-Defined Table Type from a Multi-Statement Table , Returning a User-Defined Table Type from a Multi-Statement SQL Server 2008 - General; Returning a User-Defined Table Type from I created a Multi-statement Table-valued Function (simplified for the Hopefully, a future version of SQL Server (not 2012 RTM) will enhance the abilities of table-valued As far as I understand Microsoft's MSDN article here, those user-defined table types are only available as read-only parameters to stored procedures or stored functions.. It doesn't mention anything that they could be used to be returned from a user-defined function, unfortunately - so I guess you're right - it's not possible (at least not now).
The syntax for CREATE FUNCTION indicates that the only way to define a table return type is by listing columns and types, a
<table_type_definition>. Even SQL Server "Denali" has the same definition for
<table_type_definition>. Although strangely, it's syntax doesn't include multi-statement Table valued functions, or anything else that references this fragment.
How to: Use Table-Valued User-Defined Functions, Because the return type of a table-valued function is Table , you can use a table-valued function anywhere in SQL that you can use a table. Inline Table-Valued Functions. A table-valued function is a function that returns data of table type. In this example we will create an inline table-valued function that will retrieve records of all the students whose DOB is less than the DOB passed to the function. Execute the following script on your server.
I do not believe this is possible. You cannot use a UDTT as the return type of a Scalar-Valued Function because it is not a scalar value. You also cannot replace the table declaration of a Table-Valued Function with a UDTT. Repeating the table definition seems to be the only option. If we knew why you were doing this, perhaps we could find an alternative.
return a User Defined Table Type in SQL Server? - MSDN, If you use a multi-statement table-valued function, that is exactly what it is can you this new feature as return type in user defined functions? Creates a user-defined function in SQL Server and Azure SQL Database. A user-defined function is a Transact-SQL or common language runtime (CLR) routine that accepts parameters, performs an action, such as a complex calculation, and returns the result of that action as a value. The return value can either be a scalar (single) value or a table.
User Defined Table Types And Table Valued Parameters, In this article you will learn about User Defined Table Types and Before SQL Server 2008, it was not possible to pass a table variable in stored data to a stored procedure or a function without creating a temporary table or B) Table Value Function. A table-valued user-defined function returns a rowset instead of a single scalar value. Can be invoked in the FROM clause of a SELECT statement, just as we would a table or view. A table-valued function can almost be thought of as a view that accepts parameters, so the result set is determined dynamically.
SQL Server inline table-valued functions, The simple definition of the table-valued function (TVF) can be made such like that; a user-defined function that returns a table data type and also it can accept article, SQL Server built-in functions and user-defined scalar functions, to gain The above code part specifies that the function will return a table. The concepts of User-Defined Table Types (UDTTs) and Table-Valued Parameters (TVPs) were introduced in SQL Server 2008. Before SQL Server 2008, it was not possible to pass a table variable in stored procedure as a parameter, after SQL Server now we can pass Table-Valued Parameter to send multiple rows of data to a stored procedure or a function without creating a temporary table or passing so
Table-Valued Functions in SQL Server, User Defined Functions can return scalar values or table type data. In this article we're going to take a look at the functions that return table type Table-valued parameters are declared by using user-defined table types. You can use table-valued parameters to send multiple rows of data to a Transact-SQL statement or a routine, such as a stored procedure or function, without creating a temporary table or many parameters.
- Confirmed still not possible with 2014.
- This is a better answer than the currently marked one.
- I know this is an old question, but IMVHO you should unmark your answer and mark the answer from James as it explains and solves the issue nicely.
- So i guess the answer is still no. :) Dang. All im trying to achieve here is a type of "contract" between the UDF and the code that is calling it. Keeps the T-SQL "D-R-Y". There's not much point even using the UDTT here if i can't return it from the function. Oh well. Thanks anyway.
- I know i cant return a UDT from a Scalar function. But in regards to Table functions - you are able to return tables (or table variables). A UDT is just another table so cant see why you cant return it. Oh well, maybe in the next version of SS. =) Im doing this because i have a table variable which was being duplicated amongst numerous functions/procs. Therefore i put it in an UDT to prevent being "DRY". Easier to maintain, etc.