Created
June 25, 2019 15:11
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解 leetcode db 問題需要用到的一招
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| SELECT id, | |
| @dep := dep dep, | |
| @cnt := IF(@dep = dep, @cnt + 1, 1) cnt | |
| FROM `emp`, | |
| (SELECT @cnt := 0, @dep := 0) init |
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