can i join two sql queries in php ??

Answer 1

SELECT * FROM students WHERE id = 5 OR age > 18

if you to select from 2 different column

SELECT * FROM students WHERE id = 5
union
SELECT * FROM DETAIL where age >18

Answer 2

use union

Ex:
SELECT * FROM students WHERE id=5
UNION
SELECT * FROM students WHERE age>18

Answer 3

yes u can join two sql queries in php

Answer 4

yes u can...