Commit 4917f13

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solve problem Swap Salary

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`@@ -325,4 +325,5 @@ All solutions will be accepted!`
`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`	`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\|`
	`328`	`+\|196\|[Delete Duplicate Emails](https://leetcode-cn.com/problems/delete-duplicate-emails/description/)\|[mysql](./database/DeleteDuplicateEmails)\|Easy\|`
	`329`	`+\|627\|[Swap Salary](https://leetcode-cn.com/problems/swap-salary/description/)\|[mysql](./database/SwapSalary)\|Easy\|`

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	`1`	`+# Swap Salary`
	`2`	`+We can solve this problem by CASE ... WHEN ... THEN ... END;`

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`@@ -0,0 +1,2 @@`
	`1`	`+# Write your MySQL query statement below`
	`2`	`+update salary set sex = CASE sex WHEN 'm' THEN 'f' ELSE 'm' END;`

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