Commit 43ab9f1

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solve problem Customers Who Never Order

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Original file line number	Diff line number	Diff line change
`@@ -327,4 +327,5 @@ All solutions will be accepted!`
`327`	`327`	`\|620\|[Not Boring Movies](https://leetcode-cn.com/problems/not-boring-movies/description/)\|[mysql](./database/NotBoringMovies)\|Easy\|`
`328`	`328`	`\|196\|[Delete Duplicate Emails](https://leetcode-cn.com/problems/delete-duplicate-emails/description/)\|[mysql](./database/DeleteDuplicateEmails)\|Easy\|`
`329`	`329`	`\|627\|[Swap Salary](https://leetcode-cn.com/problems/swap-salary/description/)\|[mysql](./database/SwapSalary)\|Easy\|`
`330`		`-\|175\|[Combine Two Tables](https://leetcode-cn.com/problems/combine-two-tables/description/)\|[mysql](./database/CombineTwoTables)\|Easy\|`
	`330`	`+\|175\|[Combine Two Tables](https://leetcode-cn.com/problems/combine-two-tables/description/)\|[mysql](./database/CombineTwoTables)\|Easy\|`
	`331`	`+\|183\|[Customers Who Never Order](https://leetcode-cn.com/problems/customers-who-never-order/description/)\|[mysql](./database/CustomersWhoNeverOrder)\|Easy\|`

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`@@ -0,0 +1,2 @@`
	`1`	`+# Write your MySQL query statement below`
	`2`	`+select Name as Customers from Customers where Id not in (select CustomerId from Orders)`

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