Answer / praveen

Static queries are the queries we normally use like SELECT *
FROM EMPLOYEE. where as dynamic queries can be built and
executed dynamically. sp_executesql system stored procedure
is used to execute dynamic sql statements.

Eg: sp_executesql N'select * from employee'

dynamic sql queries will take more time to execute when
compared to static queries

Answer / manoj

Static Queries are permanent and cannot be changed during run-time, like: "SELECT * FROM Employees"

Dynamic Queries can be changed during run-time as they are created by using variables and these variables contain parts of SQL Query, like:

DECLARE @SQL VARCHAR(MAX)
DECLARE @WHENSQL VARCHAR(2000)
DECLARE @SEARCHSQL VARCHAR(500)

SELECT @WHENSQL = 'EmployeeID'
SELECT @SEARCHSQL = '100'

SELECT @SQL = 'SELECT * FROM Employees WHERE ' + @WHENSQL + ' = ' + @SEARCHSQL

EXEC (@SQL)
-- or
EXEC sp_executesql @SQL


For more interview Questions on SQL Server: http://sqlwithmanoj.wordpress.com/interview-questions/

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