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Commit e8444d5

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delete-duplicate-emails

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Lines changed: 8 additions & 3 deletions

Original file line number	Diff line number	Diff line change
`@@ -1,7 +1,12 @@`
`1`	`1`	`# Time: O(n^2)`
`2`	`2`	`# Space: O(n)`
`3`	`3`
`4`		`-DELETE p1`
`5`		`-FROM Person p1, Person p2`
`6`		`-WHERE p1.Email = p2.Email AND p1.Id > p2.Id`
	`4`	`+DELETE FROM person`
	`5`	`+WHERE id NOT IN (`
	`6`	`+SELECT sub.min_id`
	`7`	`+FROM(`
	`8`	`+SELECT Email, MIN(ID) AS min_id`
	`9`	`+FROM Person`
	`10`	`+GROUP BY Email`
	`11`	`+) sub)`
`7`	`12`

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