MS SQL Server interview questions 之二

1 the query to find the top 2nd highest salary is below:


select top 1* from Employee where Salary not in

(select max(Salary) from Employee) order by Salary desc

2

you can get the fifth or n

th highest salary of Employee table by using this statement.



方法1 ：

Select Min(Salary) From Employee Where Salary In

(

Select Top(5) Salary

From Employee

Order By Salary DESC

)

方法2 ：

select max(salary) from emp where salary not in(select top(n-1) salary from emp order by salary desc）;

注意：

The ORDER BY clause is invalid in
views, inline functions, derived
tables, subqueries, and common table
expressions, unless TOP or FOR XML is
also specified.

3

how to delete duplicate rows in table having rowid



consider the table employe table with rowid,name and email .

delete from tblemploye where rowid not in

( select max(rowid) from tblemploye group by name, email having count(*)>1)

4 find all tables in a database


Select * from sysobjects where xtype = ‘u’

5