leetcode 196. Delete Duplicate Emails delete

阿新 • • 發佈：2019-02-12

題意：刪除Email重複的行，保留Id最小的行，也就使每個Email只保留Id最小那個

思路：用刪除語句進行刪除

delete p1
from Person as p1, Person as p2
where p1.Id > p2.Id and p1.Email = p2.Email

leetcode 196. Delete Duplicate Emails delete

題意：刪除Email重複的行，保留Id最小的行，也就使每個Email只保留Id最小那個思路：用刪除語句進行刪除 delete p1 from Person as p1, Person as

leetcode 196. Delete Duplicate Emails（SQL，刪除重複元組）39

貼原題：解析：　　本題是讓從Person表中刪除Email重複的元組。　　那麼可以用自身連線寫法和子查詢寫法兩種。　　自身連線即需要找出Email相等，Id最小的元組。　　子查詢

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leetcode 196. Delete Duplicate Emails delete

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