I have the table of 3 columns A, B, C. I want to store the sum of columns A B in the C column without using the DML statements. Can anyone help please how to do. ?
I have the table of 3 columns A, B, C. I want to store the sum of columns A B in the C column without using the DML statements. Can anyone help please how to do. ?
11.1 and especially you have virtual column
SQL> create table t 2 ( 3 a number 4 , b number 5 , c generated always as (a+b) virtual 6 ); Table created. SQL> insert into t (a, b) values (1, 2); 1 row created. SQL> select * from t; A B C ---------- ---------- ---------- 1 2 3
Before that, a front insert - trigger
SQL> create table t 2 ( 3 a number 4 , b number 5 , c number 6 ); Table created. SQL> create or replace trigger t_default before insert on t for each row 2 begin 3 :new.c := :new.a+:new.b; 4 end; 5 / Trigger created. SQL> insert into t (a, b) values (1, 2); 1 row created. SQL> select * from t; A B C ---------- ---------- ---------- 1 2 3
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