196. Delete Duplicate Emails
Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id.
+----+------------------+
| Id | Email |
+----+------------------+
| 1 | [email protected] |
| 2 | [email protected] |
| 3 | [email protected] Id is the primary key column for this table.
For example, after running your query, the above Person table should have the following rows:
+----+------------------+
| Id | Email |
+----+------------------+
| 1 | [email protected] |
| 2 | [email protected] 解題思路
使用拼接兩張自身表，刪除Email相同且id不為最小的所有Email
delete p1 from Person p1, Person p2 where p1.Email=p2.Email and p1.Id>p2.Id 相關推薦
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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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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
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Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest I
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Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id. +----+------------
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