47 lines
1.1 KiB
MySQL
47 lines
1.1 KiB
MySQL
|
-- Copyright 2018 Tanel Poder. All rights reserved. More info at http://tanelpoder.com
|
||
|
|
-- Licensed under the Apache License, Version 2.0. See LICENSE.txt for terms & conditions.
|
||
|
|
|
||
|
|
DROP TABLE cons_demo;
|
||
|
|
|
||
|
|
CREATE TABLE cons_demo (owner varchar2(100), object_name varchar2(128));
|
||
|
|
|
||
|
|
INSERT /*+ APPEND */ INTO cons_demo SELECT owner, object_name FROM dba_objects;
|
||
|
|
COMMIT;
|
||
|
|
|
||
|
|
SELECT COUNT(*) FROM cons_demo;
|
||
|
|
@x
|
||
|
|
|
||
|
|
CREATE INDEX idx1_cons_demo ON cons_demo(owner);
|
||
|
|
|
||
|
|
SELECT COUNT(*) FROM cons_demo;
|
||
|
|
@x
|
||
|
|
|
||
|
|
SELECT /*+ INDEX(cons_demo cons_demo(owner)) */ COUNT(*) FROM cons_demo;
|
||
|
|
|
||
|
|
ALTER TABLE cons_demo MODIFY owner NOT NULL NOVALIDATE;
|
||
|
|
|
||
|
|
INSERT INTO cons_demo VALUES (null, 'x');
|
||
|
|
|
||
|
|
SELECT COUNT(*) FROM cons_demo;
|
||
|
|
@x
|
||
|
|
|
||
|
|
ALTER TABLE cons_demo MODIFY owner NULL;
|
||
|
|
--ALTER TABLE cons_demo MODIFY owner NOT NULL VALIDATE;
|
||
|
|
--ALTER TABLE cons_demo MODIFY owner NOT NULL DEFERRABLE INITIALLY DEFERRED VALIDATE;
|
||
|
|
ALTER TABLE cons_demo MODIFY owner NOT NULL DEFERRABLE VALIDATE;
|
||
|
|
|
||
|
|
SELECT COUNT(*) FROM cons_demo;
|
||
|
|
@x
|
||
|
|
|
||
|
|
|
||
|
|
DROP TABLE cons_demo2;
|
||
|
|
|
||
|
|
CREATE TABLE cons_demo2 AS SELECT * FROM scott.emp;
|
||
|
|
|
||
|
|
ALTER TABLE cons_demo2 ADD CONSTRAINT c2 CHECK (SAL > 500);
|
||
|
|
|
||
|
|
SELECT * FROM cons_demo2 WHERE sal = 100;
|
||
|
|
|
||
|
|
@x
|
||
|
|
|