How can you determine if a variable is null in plsql?

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In PL/SQL, you can determine if a variable is null by using the "IS NULL" condition. For example:

IF myvariable IS NULL THEN DBMSOUTPUT.PUT_LINE('The variable is null'); END IF;

You can also use the "IS NOT NULL" condition to check if a variable is not null. For example:

IF myvariable IS NOT NULL THEN DBMSOUTPUT.PUT_LINE('The variable is not null'); END IF;

Note that it is important to check for null values, as attempting to access a null variable or column can result in unexpected behavior or errors.