Can PL SQL function return null?

Can PL SQL function return null?

A function can return null. The function must return something (even null, but a RETURN statement must be executed).

Can a function return null?

If your function is usually returns something but doesn’t for some reason, return null; is the way to go. That’s similar to how you do it e.g. in C: If your function doesn’t return things, it’s void , otherwise it often return either a valid pointer or NULL.

WHAT IS null value in PL SQL?

The NULL statement is an executable statement that does nothing. The NULL statement can act as a placeholder whenever an executable statement is required, but no SQL operation is wanted; for example, within a branch of the IF-THEN-ELSE statement.

What does return null return?

Returning null is usually the best idea if you intend to indicate that no data is available. An empty object implies data has been returned, whereas returning null clearly indicates that nothing has been returned.

Can we create function without return in Oracle?

Oracle PL/SQL functions must have a return. If you declare your subprogram as a procedure, then it won’t give you errors when it is lacking a return (procedures can’t have a return).

What is Nullif Oracle?

Description. The Oracle/PLSQL NULLIF function compares expr1 and expr2. If expr1 and expr2 are equal, the NULLIF function returns NULL. Otherwise, it returns expr1.

How do you return nothing in a function?

You can use the return keyword with nothing only in functions that have a return type of void . You can use the return keyword with NULL in any function that has a pointer (not reference) type as its return type.

How do I return a NULL in SQL Server?

Nulls in SQL Functions You can use the NVL function to return a value when a null occurs. For example, the expression NVL(commission_pct,0) returns 0 if commission_pct is null or the value of commission_pct if it is not null.

How do you return an empty value in SQL?

There are two ways to replace NULL with blank values in SQL Server, function ISNULL(), and COALESCE(). Both functions replace the value you provide when the argument is NULL like ISNULL(column, ”) will return empty String if the column value is NULL.

Should I use null or empty string?

It depends on the domain you are working on. NULL means absence of value (i.e. there is no value), while empty string means there is a string value of zero length. For example, say you have a table to store a person’ data and it contains a Gender column.

How do I return a null in SQL Server?

How do I use the Oracle/PLSQL NULLIF function?

This Oracle tutorial explains how to use the Oracle/PLSQL NULLIF function with syntax and examples. The Oracle/PLSQL NULLIF function compares expr1 and expr2. If expr1 and expr2 are equal, the NULLIF function returns NULL.

Do Oracle PL/SQL functions have to have a return?

Oracle PL/SQL functions must have a return. If you declare your subprogram as a procedure, then it won’t give you errors when it is lacking a return (procedures can’t have a return).

How to return a function from a subprogram in PL/SQL?

BEGIN FOR attribute_record IN c_attributes LOOP END LOOP; END; Oracle PL/SQL functions must have a return. If you declare your subprogram as a procedure, then it won’t give you errors when it is lacking a return (procedures can’t have a return).

Why does my PLSQL code fail when I try to execute?

PLSQL is NOT executing the else, you are getting no data found from your IF/THEN block. and if you simply comment out your WHEN NO_DATA_FOUND, allowing the code to fail naturally and normally, you’ll get a neat print out of the actual line that causes the FAILURE.