IF statement using output of SPROC SQL [duplicate] - sql-server

Question

This question already has answers here:
TSQL: Call a stored procedure from another stored procedure and read the result
(5 answers)
Closed 4 years ago.
I am creating stored procedures (sprocs) to perform operations on my tables in my database. I have a sproc SubjectExists that returns '1' if the subject name entered is in the subject table and returns '0' if it does not exist.
CREATE PROCEDURE SubjectExists #SubjName varhcar(20)
AS
SELECT CASE WHEN EXISTS(
SELECT *
FROM Subject
WHERE Subject_Name = #SubjName
)
THEN CAST (1 AS BIT)
ELSE CAST (0 AS BIT)
END
I am now making another sproc that deletes a subject from the table. I want to make this sproc such that it uses SubjectExists and if the output of it is a 1 (i.e. the subject does exist) then it deletes the subject and if the output from SubjectExists is 0, it does nothing.
How would I go about doing this?
I have tried experimenting with the below but no luck so far.
CREATE PROCEDURE DeleteSubject #SubjName varchar(20)
AS
IF (EXEC StudentExists Bob)
DELETE FROM Subject
WHERE Subject_Name = #SubjName;
Can anyone please guide me as to how I would do this.
Thanks

Answer 1

At first, your stored procedure should return value:
CREATE PROCEDURE SubjectExists #SubjName varchar(20)
AS
BEGIN
DECLARE #ReturnValue int
SELECT #ReturnValue = CASE WHEN EXISTS(
SELECT *
FROM Subject
WHERE Subject_Name = #SubjName
)
THEN CAST (1 AS BIT)
ELSE CAST (0 AS BIT)
END
RETURN #ReturnValue
END
Then you can declare some table to store results of your stored procedure and if it is eligible, then run your code
DECLARE #FooValue int;
EXEC #FooValue = SubjectExists 'helloWorld!:)'
IF #FooValue = 1
BEGIN
DELETE FROM Subject
WHERE Subject_Name = #SubjName;
END

Answer 2

You need to get the return value from the stored procedure like this-
DECLARE #returnvalue INT
EXEC #returnvalue = StudentExists Bob
and then you can make your If condition.