What Is NULL in PL/SQL
Q
What Is NULL in PL/SQL? - Oracle DBA FAQ - Understanding PL/SQL Language Basics
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A
NULL is a reserved key word and it stands for two things in PL/SQL:
- NULL is an executable statement, and means doing nothing.
- NULL is a data balue, and means no value.
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, 5058👍, 0💬
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