Wednesday, June 12, 2013

0 DB2 SQL: identity column

CREATE TABLE t4(c1 int generated always as identity,c_desc char(20));
-- Below insert would fail
Insert into t4 values ( 1,'A');


Because the c1 is defined  generated always as identity, therefore we can not specify the value in the insert statement. Below insert would work.

insert into t4(c_desc) values( 'B')



CREATE TABLE t5(c1 int generated by default as identity,c_desc char(20));
Insert into t5 values ( 1,'A');
select * from t5;



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