Question

I have a mysql tables which has column for salary. I was able to compute for the columns 18% and 9% value by using:

SELECT SALARY, SALARY * .09 as ‘PS’, SALARY * .12 as ‘GS’ FROM database.table;

1. How would I add an additional column on this table based on the result of the sql statement? What I meant is I wanted to add columns ‘PS’ and ‘GS’ to my table.

2. If this is possible on the same table, how would I create another table based on the result of the sql statement (new table containing PS and GS) through sql script/statement.

Answer 1

1) In order to add an additional column to the table you must use the alter command.

ALTER TABLE database.table ADD PS varchar(10); ---- or whatever type of column
ALTER TABLE database.table ADD GS varchar(10); ---- or whatever type of column
UPDATE database.table SET PS = SALARY * .09, GS = SALARY * .12;

2) You must first create the table and then insert into it your previous query.

CREATE TABLE database.secondtable (PS varchar(10), GS varchar(10));
INSERT INTO database.secondtable (PS,GS) VALUES(SELECT SALARY, SALARY * .09 as 'PS', SALARY * .12 as 'GS' FROM database.table);