IS NULL function in PL SQL?
The Oracle IS NULL condition is used to test for a NULL value. You can use the Oracle IS NULL condition in either a SQL statement or in a block of PLSQL code.
IS NULL in if statement SQL?
The IS NULL condition is used in SQL to test for a NULL value. It returns TRUE if a NULL value is found, otherwise it returns FALSE. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.
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.
IS NOT NULL in PL SQL?
Example – With SELECT Statement Here is an example of how to use the Oracle IS NOT NULL condition in a SELECT statement: SELECT * FROM customers WHERE customer_name IS NOT NULL; This Oracle IS NOT NULL example will return all records from the customers table where the customer_name does not contain a null value.
How do I check if a string is empty in PL SQL?
To check if a variable is an empty string, use the IS NULL syntax. That would check if they are both null.
What is NULL and not null in Oracle?
SQL Reference for Oracle NoSQL Database If the result of the input expression is empty, IS NULL returns false. Otherwise, IS NULL returns true if and only if the single item computed by the input expression is NULL. The IS NOT NULL operator is equivalent to NOT (IS NULL cond_expr). NULL is explained in Table 2-2.
How do I check if a column is null in SQL?
How to Test for NULL Values?
- SELECT column_names. FROM table_name. WHERE column_name IS NULL;
- SELECT column_names. FROM table_name. WHERE column_name IS NOT NULL;
- Example. SELECT CustomerName, ContactName, Address. FROM Customers. WHERE Address IS NULL;
- Example. SELECT CustomerName, ContactName, Address. FROM Customers.
What is NULL in Plsql?
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.
Is NULL and NULL in Oracle?
One of the most mindboggling values in the Oracle database is the NULL value. What is NULL? NULL is nothing. NULL is not even the same as NULL.