Execute Dynamic SQL commands in SQL Server

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In some applications having hard-coded SQL statements is not appealing, because of the dynamic nature of the queries being issued against the database server. Because of this sometimes there is a need to dynamically create a SQL statement on the fly and then run that command. This can be done quite simply from the application perspective where the statement is built on the fly whether you are using ASP.NET , ColdFusion or any other programming language. But how do you do this from within a SQL Server stored procedure? SQL Server offers a few ways of running a dynamically built SQL statement. These ways are: Writing a query with parameters Using EXEC Using sp_executesql Writing a query with parameters This first approach is pretty straightforward if you only need to pass parameters into the WHERE clause of your SQL statement. Let’s say we need to find all records from the Customers table where City = ‘London’. This can be done easily as the following example shows.
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what is bcp

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bcp is a unix bulk copy utility used to transfer data from file to table and vice versa.
Ex
1.bcp dbname..tablename out pub_out –c –t ,-r userid –servername
user will be prompted for database password.
In the above example the data from publisher’s table present in pubs2 database is copied to physical file pub_out
2
-c option copies out the data from publisher table in character format
-t option terminator ends each field with comma.
-r row terminator ends each field with return


2.bcp..tablename in pub-out –c –t, -r userid –servername

user will be prompted for database password
above example 2 shows how to copy the data into adaptive server.

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