回复： [SQL] How to use postgresql generated generated always COLUMN ?

Thank you for your help, I under test

------------------ 原始邮件 ------------------
发件人: "David G. Johnston"<david(dot)g(dot)johnston(at)gmail(dot)com>;
发送时间: 2016年12月31日(星期六) 中午12:52
收件人: "Tank.zhang"<6220104(at)qq(dot)com>;
抄送: "pgsql-sql(at)postgresql(dot)org"<pgsql-sql(at)postgresql(dot)org>;
主题: Re: [SQL] How to use postgresql generated generated always COLUMN ?

On Friday, December 30, 2016, tank.zhang <6220104(at)qq(dot)com> wrote:
DB2 operation:

db2 "create table emp(id int,name char(10),salary int,rev_salary integer
generated always as (salary*50/100))"


[db2inst2(at)db2 ~]$ db2 "insert into emp(id,name,salary)
values(100,'asdf',51100)"

[db2inst2(at)db2 ~]$ db2 "select * from emp"

ID NAME SALARY REV_SALARY
----------- ---------- ----------- -----------
100 asdf 500 250
100 asdf 6600 3300
100 asdf 51100 25550

*How to use postgresql implement?*

You have to use CREATE VIEW. Possibly with insert/update/delete triggers to interact with the backing table.

David J.