将mysql boolean返回为'yes'或'no'

Question

I have a BOOLEAN type column in my table. I would like to convert the 0/1 to Yes/No when the results are returned.

I found a response on this thread: Echo boolean field as yes/no or other values

The response mentioned an IF THEN statement, but when I try, I only get a complaint from MySQL that there is a syntax error. Here is the line I am using:

IF qz.quiz_enabled == 1 THEN 'yes' ELSE 'no' AS enabled

Here is the error:

use near 'qz.quiz_enabled == 1 THEN 'yes' ELSE 'no' AS enabled

Answer 1

select case when qz.quiz_enabled 
            then 'yes' 
            else 'no' 
       end

or

select if(qz.quiz_enabled, 'yes', 'no')

SQLFiddle demo

Answer 2

http://dev.mysql.com/doc/refman/5.0/en/if.html

BEGIN
DECLARE s VARCHAR(20);

IF n > m THEN SET s = '>';
ELSEIF n = m THEN SET s = '=';
ELSE SET s = '<';
END IF;

SET s = CONCAT(n, ' ', s, ' ', m);

RETURN s;
END