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PL/SQL is procedural extension for SQL created by Oracle. It is by default embedded into the Oracle Database. PL/SQL program units are compiled and stored inside the Oracle Database which results in optimal execution times as the PL/SQL and SQL run within the same server process.
Following is the syntax structure for the PL/SQL code blocks
DECLARE
<declarations section>
BEGIN
<executable command(s)>
EXCEPTION
<exception handling>
END;
DECLARE
message varchar2(100):= 'Hello, World!';
BEGIN
dbms_output.put_line(message);
END;
/
CREATE OR REPLACE FUNCTION
hello_user
(user_name IN VARCHAR2)
RETURN VARCHAR2
IS
BEGIN
RETURN 'Hello ' || user_name;
END hello_user;
/
BEGIN
dbms_output.put_line(hello_user('Peter'));
END;
/
BEGIN
DBMS_OUTPUT.put_line (1/0);
EXCEPTION
WHEN OTHERS
THEN
DBMS_OUTPUT.put_line ('error is: ' || SQLERRM);
END;