mysql數據表之間求餘集

//數據表之間有相同類型的數據列求餘集(數據表見圖) mysql> (SELECT a.id FROM etl02 a LEFT OUTER JOIN etl01 b ON a.id = b.id WHERE b.id is null)     -> UNION     -> (SELECT c.id FROM etl01 c LEFT OUTER JOIN etl02 d ON c.id = d

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