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).
WHAT IS NULL value Oracle?
If a column in a row has no value, then the column is said to be null, or to contain null. Oracle Database currently treats a character value with a length of zero as null. …
Can we create function without return in Oracle?
It for examples allows you to code a string value for a variable (or parameter) that has a date data type. So at compile time it allows strings to be passed as date data type values. So this is why a function will compile without an error when missing a return.
Can a bool function return null?
A Boolean function should return only TRUE or FALSE. A non-Boolean function can use a NULL return value to indicate failure. A function that returns the title of a book for an ISBN number returns NULL for an invalid ISBN. That makes sense.
Can function return more than one value in Plsql?
But we can use OUT parameter to return multiple value from a procedure. Similarly we can also return multiple value from a function by using TABLE type object. We can also say that collection type object can be made as TABLE type object in oracle plsql. Here we are going to returns two column’s value from our function.
How do you handle null values in PL SQL?
The NVL function allows you to replace null values with a default value. If the value in the first parameter is null, the function returns the value in the second parameter. If the first parameter is any value other than null, it is returned unchanged.
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.
IS null function in Oracle SQL?
NVL. The NVL function allows you to replace null values with a default value. If the value in the first parameter is null, the function returns the value in the second parameter. If the first parameter is any value other than null, it is returned unchanged.
What is the difference between procedure and function in PL SQL?
A procedure is a named PL/SQL block that carries out one or more actions. A function is a named PL/SQL block that returns a value.
Can functions return more than one value at a time?
Even though a function can return only one value but that value can be of pointer type. If we want the function to return multiple values of same data types, we could return the pointer to array of that data types. We can also make the function return multiple values by using the arguments of the function.
How to return nullable type in SQL function?
Create FUNCTION [dbo]. [SetDBNullNvarChar] (@input nvarchar (1000)) RETURNS (needs to be nullable) AS BEGIN if (@input = ” OR @input = 0) BEGIN RETURN null END return @input END Any data type in SQL can be set to null unless a not null restriction is put on it. Therefore you should be able to use whatever return type best suits your needs…
How to replace null in a SQL Server Function?
Given below is the script to replace NULL using ISNULL (a SQL Server built-in function). Given below is the script to replace NULL using COALESCE (a SQL Server built-in function). Given below is the script to replace NULL using CASE STATEMENT (a SQL Server expression).
Can a data type be set to null in SQL?
2 Answers 2. Any data type in SQL can be set to null unless a not null restriction is put on it. Therefore you should be able to use whatever return type best suits your needs… In your calling code, you’d have to check to see if the returned value is equal to DBNull.Value and have your code act accordingly.
How to avoid null values in legacy data?
In legacy data, it is very common that you find a lot of unnecessary NULL values and you need to do massage to present this data, whether it is a report or an email. Generally, we use few techniques to avoid NULL and replace it with any characters or numbers.
