Oracle/PLSQL: IS NOT NULL

In other languages, a not null value is found using the != null syntax. However in PLSQL to check if a value is not null, you must use the "IS NOT NULL" syntax.

For example,

IF Lvalue IS NOT NULL then

.

END IF;

If Lvalue does not contain a null value, the "IF" expression will evaluate to TRUE.

You can also use "IS NOT NULL" in an SQL statement. For example:

select * from suppliers where supplier_name IS NOT NULL;

This will return all records from the suppliers table where the supplier_name does not contain a null value.