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I thought that this would work... but it doesn't, I would like to get a total from both returned results, basically this should always return one row and one column. It should contain a number 0+.

 

SELECT SUM((SELECT COUNT(m.id) FROM mailbox m WHERE m.status = '0')
UNION
(SELECT COUNT(f.id) FROM friends f WHERE f.acc = '0')) as total

 

How could I fix it?

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