10. Validity Checking(contd.) CHECK CONSTRAINT EXAMPLE Create table test (rollno number(2) check (rollno between 1 and 80), name varchar2(15) ); Insert into test values(55,’ANANYA’); 1 row inserted Insert into test values(85,’AKSHAT’); ERROR-Check constraint violated
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12. Validity Checking(contd.) Domain example Create DOMAIN dom_val_bet number(2) CHECK (value between 1 and 60); Create TABLE test1 (rollno dom_val_bet, name varchar2(15) ); Create table test2 (rollno dom_val_bet, marks number(3) );
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41. Business Rules(contd.) TRIGGERS FORMAT Create [or replace] trigger <trigger_name> [enable|disable] <before|after> <insert|update|delete> [of <column_name_list>] On <table_name> [referencing new as <synonym>] [for each row] [when (trigger_condition)] <trigger_code>
