Returning 1 or 0 in specific SQL query

问题

I have three columns in the table MYTABLE (ID, NUM, NAMES). There is a column NAMES. I need to check on NAMES column to see if the first name is JACK or BRUCE and the corresponding NUM column = 0. If the match is found, return 1 else 0.

ID NUM NAMES    
1  1   'TOM'
2  1   'MIKE'
3  0   'JACK'
4  1   'MICKY'
5  0   'BRUCE'

I've came up with the following query:

select *
  case NAMES in ('JACK', 'BRUCE') and NUM=0 then 1 else 0 end as MYNAMES
from MYTABLE;

That does not work unfortunately.

回答1:

This works (SQLFiddle demo):

SELECT id, num,
    CASE WHEN names IN ('JACK', 'BRUCE') AND num=0
    THEN 1 ELSE 0 END AS mynames
FROM mytable

回答2:

select  case
        when exists
        (
        select  *
        from    YourTable
        where   name in ('JACK', 'BRUCE')
                and NUM = 0
        )
        then 1
        else 0
        end
from    dual

Live example at SQL Fiddle.

回答3:

select case when NAMES in ('JACK','BRUCE') AND NUM = 0
            then 1
            else 0
       end
from your_table

来源：https://stackoverflow.com/questions/14770092/returning-1-or-0-in-specific-sql-query