SQL Server : Procedure, setting value for the variables [closed] - sql

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Intending to update Table6 with the following procedure. I have set variables and they are correctly addressed but how do I define value for the 2 types of variables. there are search variables and update variables
Procedure with condition if the cell has NULL value than add whatever the Variable has but if it already has value then leave its original value/don't overwrite it.
CREATE PROCEDURE dbo.[Learning]
#StartDate DATE NULL,
#EndDate DATE NULL,
#Data VARCHAR(30) NULL,
#Cond_CID INT NOT NULL,
#Cond_PID INT NOT NULL,
#Cond_SSC VARCHAR(3) NOT NULL
AS
BEGIN
BEGIN
UPDATE temp.dbo.Table6
SET StartDate = ISNULL(StartDate,#StartDate)
,EndDate = ISNULL(EndDate,#EndDate)
,Data = ISNULL(Data,#Data)
WHERE Table6.CID = #Cond_CID AND TABLE6.PID = #Cond_PID AND TABLE6.SSC = #Cond_SSc
The table and data insert
CREATE TABLE temp.dbo.Table6
(
CID INT NOT NULL,
PID INT NOT NULL,
SSC VARCHAR(3) NULL,
StartDate DATE NULL,
EndDate DATE NULL,
Data VARCHAR(30) NULL
)
INSERT INTO temp.dbo.Table6
VALUES
(1001, 1333,'OP', GETDATE(), GETDATE(), 'OP2001156519952012'),
(1002, 1245,'OR', GETDATE(), NULL, 'OR20121005'),
(1003, 1116,'OP', GETDATE(), NULL, 'OP20131215'),
(1004, 1234,'OP', GETDATE(), GETDATE(), 'OP2001156519952012')
SELECT * FROM temp.dbo.Table6
sample data which has null values and this procedure will be used to populate data into the table.

Answer 1

It seems like you want to prevent the (3) search parameters to be NULLs, but when you set those parameters as NOT NULL SQL Server will complain about it, and throw
Msg 11555 Level 15 State 1 Line 7
The parameter 'ParameterName' has been declared as NOT NULL. NOT NULL parameters are only supported with natively compiled modules, except for inline table-valued functions.
Also, I think your first 3 parameters shouldn't be NULL too, cause if you pass NULLs then your UPDATE won't do anything, just set your columns to NULL again.
You can check for NULLs in the body of your SP, and if one of them IS NULL then raise an error as
CREATE PROCEDURE dbo.[Learning]
(
#StartDate DATE,
#EndDate DATE,
#Data VARCHAR(30),
#Cond_CID INT,
#Cond_PID INT,
#Cond_SSC VARCHAR(3)
)
AS
BEGIN
IF (#Cond_CID IS NULL OR #Cond_PID IS NULL OR #Cond_SSC IS NULL
OR #StartDate IS NULL OR #EndDate IS NULL OR #Data IS NULL
)
BEGIN
RAISERROR('Null values not allowed for the 3 last parameters!', 16, 1)
END
ELSE
BEGIN
UPDATE temp.dbo.Table6
SET StartDate = ISNULL(StartDate,#StartDate)
,EndDate = ISNULL(EndDate,#EndDate)
,Data = ISNULL(Data,#Data)
WHERE Table6.CID = #Cond_CID
AND
TABLE6.PID = #Cond_PID
AND
TABLE6.SSC = #Cond_SSc
END
END
or by Creating Natively Compiled Stored Procedures.