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What Is NULL in PL/SQL
What Is NULL in PL/SQL? - Oracle DBA FAQ - Understanding PL/SQL Language Basics
✍: FYIcenter.com
NULL is a reserved key word and it stands for two things in PL/SQL:
The following sample script shows you examples of using NULL keyword:
DECLARE next_task CHAR(80); BEGIN next_task := NULL; -- NULL value IF next_task IS NOT NULL THEN DBMS_OUTPUT.PUT_LINE('I am busy.'); ELSE DBMS_OUTPUT.PUT_LINE('I am free.'); END IF; IF next_task IS NULL THEN NULL; -- NULL statement ELSE DBMS_OUTPUT.PUT_LINE('... working on ' || next_task); END IF; END;
This script should print this:
I am free.
2007-04-29, 4779👍, 0💬
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