How to write conditional select query in mysql

Question

I want to write a Login authentication query,

I want to check user Login and password if that is found in my database i fetch his details however if i cant find exact details i want to check if only the provided username exist in the table and get his name and profile pic.

i can do some thing like ..

SELCT * FROM `use_table` WHERE `username` = 'something' AND `password` = 'something'

if the above query returns empty rows then i fire another query

SELCT `name`, `profile_pic` FROM `use_table` WHERE `username` = 'something'

I can do this using multiple queries but the tricky part is i want to do this using a single query. ANY HELP ??

Answer 1

Use NOT IN :

SELECT `name`, `profile_pic` 
FROM `use_table` 
WHERE `username` = 'something' 
AND NOT IN (
    SELECT * FROM `use_table`
    WHERE `username` = 'something' AND `password` = 'something'
)

Answer 2

quit easy, you just use the second query, but with password return like this:

SELCT `name`, `profile_pic`,`password` FROM `use_table` WHERE `username` = 'something'

Then you do a compare with user input password and password that retured

if they matches, then login ok, else login failed! but you also get the user's information!