PHP/SQL：用不同的值选择2列3次

我想用不同的值选择两列

SELECT id FROM ads WHERE onoff='1' AND again='0'
SELECT id FROM ads WHERE onoff='2' AND again='1'
SELECT id FROM ads WHERE onoff='3' AND again='1'

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有没有一种方法可以在一个sql中实现这一点？

比使用或更好地执行：

SELECT id 
FROM ads 
WHERE (onoff = '1' AND again = '0')
   OR (onoff = '2' AND again = '1')
   OR (onoff = '3' AND again = '1')

 SELECT id FROM ads WHERE onoff='1' AND again='0'
 UNION ALL
 SELECT id FROM ads WHERE onoff='2' AND again='1'
 UNION ALL
 SELECT id FROM ads WHERE onoff='3' AND again='1'

或

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请你试着重新措辞你的问题，它根本没有意义。

SELECT ID FROM ADS WHERE onoff='1' AND again='0'
                      OR (onoff IN( '2','3') AND again = '1')