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docs: update readme to lc problem: No.0176 (doocs#591)

No.0176.Second Highest Salar

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`6`	`6`
`7`	`7`	`<p>Write a SQL query to get the second highest salary from the <code>Employee</code> table.</p>`
`8`	`8`
`9`		`-`
`10`		`-`
`11`	`9`	`<pre>`
`12`	`10`
`13`	`11`	`+----+--------+`
`14`		`-`
`15`	`12`	`\| Id \| Salary \|`
`16`		`-`
`17`	`13`	`+----+--------+`
`18`		`-`
`19`	`14`	`\| 1 \| 100 \|`
`20`		`-`
`21`	`15`	`\| 2 \| 200 \|`
`22`		`-`
`23`	`16`	`\| 3 \| 300 \|`
`24`		`-`
`25`	`17`	`+----+--------+`
`26`	`18`
`27`	`19`	`</pre>`
`28`	`20`
`29`		`-`
`30`		`-`
`31`	`21`	`<p>For example, given the above Employee table, the query should return <code>200</code> as the second highest salary. If there is no second highest salary, then the query should return <code>null</code>.</p>`
`32`	`22`
`33`		`-`
`34`		`-`
`35`	`23`	`<pre>`
`36`	`24`
`37`	`25`	`+---------------------+`
`38`		`-`
`39`	`26`	`\| SecondHighestSalary \|`
`40`		`-`
`41`	`27`	`+---------------------+`
`42`		`-`
`43`	`28`	`\| 200 \|`
`44`		`-`
`45`	`29`	`+---------------------+`
`46`	`30`
`47`	`31`	`</pre>`
`48`	`32`
`49`		`-`
`50`		`-`
`51`	`33`	`## Solutions`
`52`	`34`
`53`	`35`	`<!-- tabs:start -->`

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