Commit f778823

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solve problem Delete Duplicate Emails

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`@@ -324,4 +324,5 @@ All solutions will be accepted!`
`324`	`324`	`\|596\|[Big Countries](https://leetcode-cn.com/problems/big-countries/description/)\|[mysql](./database/BigCountries)\|Easy\|`
`325`	`325`	`\|182\|[Duplicate Emails](https://leetcode-cn.com/problems/duplicate-emails/description/)\|[mysql](./database/DuplicateEmails)\|Easy\|`
`326`	`326`	`\|596\|[Classes More Than 5 Students](https://leetcode-cn.com/problems/classes-more-than-5-students/description/)\|[mysql](./ClassesMoreThan5Students)\|Easy\|`
`327`		`-\|620\|[Not Boring Movies](https://leetcode-cn.com/problems/not-boring-movies/description/)\|[mysql](./database/NotBoringMovies)\|Easy\|`
	`327`	`+\|620\|[Not Boring Movies](https://leetcode-cn.com/problems/not-boring-movies/description/)\|[mysql](./database/NotBoringMovies)\|Easy\|`
	`328`	`+\|196\|[Delete Duplicate Emails](https://leetcode-cn.com/problems/delete-duplicate-emails/description/)\|[mysql](./database/DeleteDuplicateEmails)\|Easy\|`

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`@@ -0,0 +1,2 @@`
	`1`	`+# Delete Duplicate Emails`
	`2`	`+We can solve this problem by GROUP BY and temp table`

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	`1`	`+# Write your MySQL query statement below`
	`2`	`+delete from Person where Id not in (`
	`3`	`+ select temp.Id from (`
	`4`	`+ select min(Id) as Id from Person group by Email`
	`5`	`+ )`
	`6`	`+ as temp`
	`7`	`+)`

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