С MySQL можете да използвате SUM(condition)
:
SELECT id, SUM(value=0) AS n0, SUM(value=1) AS n1, COUNT(*) AS total
FROM mytable
GROUP BY id
Вижте го на sqlfiddle .
С MySQL можете да използвате SUM(condition)
:
SELECT id, SUM(value=0) AS n0, SUM(value=1) AS n1, COUNT(*) AS total
FROM mytable
GROUP BY id
Вижте го на sqlfiddle .