[英]select rows related with a column
我有這樣的桌子; col1 col2 col3 week abc 21 afg 22 cde 23 aef 24 fgh 25 acf 26 fbe 27
我想計算包含'a'且相差1周和2周等的行。 2次相差1周,1次相差0周。 week diff. count 0 1 1 2 2 0
week diff. count 0 1 1 2 2 0
等等。 謝謝,我想用我的英語不好說清楚。
我不確定我是否理解問題。 但是,假設:
然后,以下查詢可能會有所幫助:
SELECT
ABS(t2.week - t1.week) AS week_difference,
COUNT(DISTINCT t1.week) AS count
FROM
temp t1, temp t2
WHERE
((t1.col1 = 'a' OR t1.col2 = 'a' OR t1.col3 = 'a')
AND (t2.col1 = 'a' OR t2.col2 = 'a' OR t2.col3 = 'a'))
AND ABS(t2.week - t1.week) <= 2
GROUP BY
week_difference
ORDER BY
week_difference
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