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

DB2 operation:

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


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

[db2inst2@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?*


Thank you!



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