从多个表中选择计数时，列名不会更改

Question

I'm selecting count from multiple tables but the columns' names does not change though using As clause here's the code

SELECT * FROM 
(SELECT COUNT(ID) FROM  new_cards WHERE Bill_ID = '584762578412569') AS newcards,
(SELECT COUNT(ID) FROM  sold_cards WHERE Bill_ID = '584762578412569') AS soldcards

I get 2 columns and their names are COUNT(ID) both of them

Answer 1

Your query assigns aliases to the sub-queries (table aliases) not the columns. Moving the alias to the column should fix it:

SELECT * FROM 
(SELECT COUNT(ID) AS newcards FROM  new_cards WHERE Bill_ID = '584762578412569') n,
(SELECT COUNT(ID) AS soldcards FROM  sold_cards WHERE Bill_ID = '584762578412569') s