2026-03-12 20:23:15

tpt/ast/03_constraints_not_null.sql

@@ -0,0 +1,46 @@
+-- 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
+