understanding check integrity constrain

Author: techysanoj

check_integrity_constraint.sql

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+use temp_db;
+
+show tables;
+
+create table emp_new1(id int, name varchar(15), exp int, check(exp > 2));
+
+insert into emp_new1 values(1, 'SANOJ', 3); -- no error
+insert into emp_new1 values(NULL,'DEEPAK', 4); -- no error
+
+insert into emp_new1 values(2, 'KUMAR', 2); -- will gives error
+
+-- so basically check constraint is used on the column for checking the values according to the 
+-- given condition
+
+
+create table emp_new2(id int, name varchar(15), exp int, location varchar(15), check(exp > 2 and location in ('india', 'usa', 'Uk')));
+
+insert into emp_new2 values(1, 'SANOJ', 3, 'india'); -- no error
+insert into emp_new2 values(NULL,'DEEPAK', 1, 'india'); -- gives error because of exp check
+
+insert into emp_new2 values(2, 'KUUMAR', 4, 'new delhi'); -- will give error