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solve problem Second Highest Salary

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`@@ -330,4 +330,5 @@ All solutions will be accepted!`
`330`	`330`	`\|175\|[Combine Two Tables](https://leetcode-cn.com/problems/combine-two-tables/description/)\|[mysql](./database/CombineTwoTables)\|Easy\|`
`331`	`331`	`\|183\|[Customers Who Never Order](https://leetcode-cn.com/problems/customers-who-never-order/description/)\|[mysql](./database/CustomersWhoNeverOrder)\|Easy\|`
`332`	`332`	`\|197\|[Rising Temperature](https://leetcode-cn.com/problems/rising-temperature/description/)\|[mysql](./database/RisingTemperature)\|Easy\|`
`333`		`-\|181\|[Employees Earning More Than Their Managers](https://leetcode-cn.com/problems/employees-earning-more-than-their-managers/description/)\|[mysql](./database/EmployeesEarningMoreThanTheirManagers)\|Easy\|`
	`333`	`+\|181\|[Employees Earning More Than Their Managers](https://leetcode-cn.com/problems/employees-earning-more-than-their-managers/description/)\|[mysql](./database/EmployeesEarningMoreThanTheirManagers)\|Easy\|`
	`334`	`+\|176\|[Second Highest Salary](https://leetcode-cn.com/problems/second-highest-salary/description/)\|[mysql](./database/SecondHighestSalary)\|Easy\|`

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`@@ -0,0 +1,2 @@`
	`1`	`+# Second Highest Salary`
	`2`	`+We can solve this problem by limit and order by`

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`@@ -0,0 +1,4 @@`
	`1`	`+# Write your MySQL query statement below`
	`2`	`+select (`
	`3`	`+ select distinct Salary from Employee order by Salary desc limit 1, 1`
	`4`	`+) as SecondHighestSalary`

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