[英]Sub-query with count(*)
如何從子查詢count(*)
數據中獲取與left(number,7)
相關聯的失敗數據?
例如,我這樣做:
SELECT * FROM table1 WHERE outcome = 'Fail' AND left(number,7) =
(SELECT count(*) as total, left(number,7) as prefix
FROM table1 where outcome like '%Passed%'
group by prefix order by total desc limit 250)
這將無法工作,因為子查詢中有兩個字段..那么如何解決呢?
您可以使用JOIN
代替子查詢:
SELECT t1.*, t2.total, ...
FROM table1 AS t1
INNER JOIN
(
SELECT count(*) as total, left(number,7) as prefix
FROM table1
where outcome like '%Passed%' AND outcome = 'Fail'
group by prefix
order by total desc limit 250
) AS t2 ON t2.prefix = left(t1.number,7)
試試這個查詢
SELECT *
FROM
table1 a
INNER JOIN
(SELECT
count(*) as total,
left(number,7) as prefix
FROM
table1
where
outcome like '%Passed%'
group by
prefix
order by
total desc limit 250)b
ON
a.outcome = 'Fail' AND
left(number,7) = b.prefix
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