function can return multiple value?how give give sample coding




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function can return multiple value?how give give sample coding..

Answer / manikanta.srinu

Function can't return multiple value.
There are 3 types of functions are in sql server.
1.Scalar valued function:This function can return only one
value.
2.Inline table-valued functions:return a single table
variable that was created by a select statement.
3.Multitable valed function
:Returns a table variable whose structure was created by
hand, similar to a Create Table statement. It is useful
when complex data manipulation inside the function is
required.
1). Scalar Function
create function scalarvalue()
returns int
as
begin
return 1
end
Go
Scalar functions are usually deemed a performance hit,
because they are executed on a per-row basis.
Calling Function
select dbo.scalarvalue()

Note: We can create @temp variable in sclar function.
2). Inline table-valued functions
create function inlinetable()
returns table
as
RETURN SELECT a.SaleId, a.CustomerID, b.Qty
FROM Sales.Sales a INNER JOIN Sales.SaleDetail b
ON a.SaleId = b.SaleId
INNER JOIN Production.Product c ON b.ProductID =
c.ProductID
WHERE a.ShipDate IS NULL
go

Calling Function
select * from dbo.fun1()

Note: We can’t create @temp variable in inline table
valued function.
2). Multi-statement table-valued functions
create function fun2()
RETURNS @CustomerOrder TABLE
(SaleOrderID INT NOT NULL,
CustomerID INT NOT NULL,
OrderDate DATETIME NOT NULL,
OrderQty INT NOT NULL)
AS
BEGIN
DECLARE @MaxDate DATETIME

SELECT @MaxDate = MAX(OrderDate)
FROM Sales.SalesOrderHeader
WHERE CustomerID = @CustomerID

INSERT @CustomerOrder
SELECT a.SalesOrderID, a.CustomerID, a.OrderDate,
b.OrderQty
FROM Sales.SalesOrderHeader a INNER JOIN
Sales.SalesOrderHeader b
ON a.SalesOrderID = b.SalesOrderID
INNER JOIN Production.Product c ON b.ProductID =
c.ProductID
WHERE a.OrderDate = @MaxDate
AND a.CustomerID = @CustomerID
RETURN
END
Calling Function
select * from dbo.fun2()
Note: We can create @temp variable in multi statement
table valued function.

Is This Answer Correct ?    7 Yes 1 No

function can return multiple value?how give give sample coding..

Answer / rahul poptani

Function returns only 1 value
BUT you can return multiple value Indireclty..
1) By returning an result set -

CREATE OR REPLACE FUNCTION GET_DEPT_INFO (P_DEPTNO IN NUMBER) RETURN SYS_REFCURSOR
AS
V_RC SYS_REFCURSOR;
BEGIN
OPEN V_RC FOR SELECT DEPTNO, DNAME, LOC FROM DEPT WHERE DEPTNO = P_DEPTNO;
RETURN V_RC;
END;

SQL> VAR RESULTSET REFCURSOR;
SQL> EXEC :RESULTSET := GET_DEPT_INFO(10)

PL/SQL procedure successfully completed.
SQL> PRINT :RESULTSET

DEPTNO DNAME LOC
---------- -------------- -------------
10 ACCOUNTING NEW YORK

2)PROVIDING OUT MODE PARAMETERS IN FUNCTION (RARELY USED)

SQL> CREATE OR REPLACE FUNCTION OUTMODE_EXAMPLE (P_DEPTNO NUMBER, P_DNAME OUT VARCHAR2)
2 RETURN NUMBER
3 AS
4 BEGIN
5 SELECT DNAME INTO P_DNAME FROM DEPT WHERE DEPTNO = P_DEPTNO;
6 RETURN NULL;
7 END;
8 /

Function created.

SQL> DECLARE
2 V_DNAME DEPT.DNAME%TYPE;
3 V NUMBER;
4 BEGIN
5 V := OUTMODE_EXAMPLE(10,V_DNAME);
6 DBMS_OUTPUT.PUT_LINE(V_DNAME);
7 END;
8 /
ACCOUNTING

PL/SQL procedure successfully completed.

Is This Answer Correct ?    6 Yes 0 No

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