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Jun 13, 2012

How to pass a list of values or array to SQL Server stored procedure?

There is no built-in support for arrays in SQL Server's T-SQL. SQL Server 2000 did add some new datatypes like sql_variant, bigint etc, but no support for the much needed arrays. There are some situations, that require the ability to pass a list of values to a stored procedure. Think about a web page, that lets the user select one or more of his/her previous orders, on submit, retrieves complete information about the selected orders. In this case, passing a list of selected order numbers to the stored procedure, in one go, and getting the results back is more efficient, compared to calling the same stored procedure for each selected order number.

Since, we cannot create arrays of variables or input parameters or columns in T-SQL, we need to look for workarounds and alternatives. Over the years, programmers developed different techniques, some of which are not so efficient, some efficient, but complex. The most popular technique is to pass in a list of values, separated by commas (CSV). With this method, the normal input parameter of the stored procedure receives a list of say, OrderIDs, separated by commas.

Dynamic SQL :

CREATE PROC dbo.GetOrderList1
                    @OrderList varchar(500)

                    SET NOCOUNT ON
                    DECLARE @SQL varchar(600)
                    SET @SQL = 'SELECT OrderID, CustomerID, EmployeeID, OrderDate FROM dbo.Orders                   WHERE OrderID IN (' + @OrderList + ')'

GRANT EXEC ON dbo.GetOrderList1 TO WebUser

GRANT SELECT ON dbo.Orders TO WebUser

Aug 24, 2008

Write some disadvantage of Cursor ?

Cursor plays there row quite nicely but although there are some disadvantage of Cursor .
Because we know cursor doing roundtrip it will make network line busy and also make time consuming methods. First of all select query gernate output and after that cursor goes one by one so roundtrip happen.Another disadvange of cursor are ther are too costly because they require lot of resources and temporary storage so network is quite busy.

What are Checkpoint in SQL Server ?

When we done operation on SQL SERVER that is not commited directly to the database.All operation must be logged in to Transaction Log files after that they should be done on to the main database.CheckPoint are the point which alert Sql Server to save all the data to main database if no check point is there then log files get full we can use Checkpoint command to commit all data in the SQL SERVER.When we stop the SQL Server it will take long time because Checkpoint is also fired.

Can You explain integration between SQL Server 2005 and Visual Studio 2005 ?

This intergration provide wider range of development with the help of CLR for database server.Becasue CLR helps developers to get flexibility for developing database applications and also provides language interoperability just like Visual C++, Visual Basic .Net and Visual C# .Net. The CLR helps developers to get the arrays, classes and exception handling available through programming languages such as Visual C++ or Visual C# which is use in stored procedures, functions and triggers for creating database application dynamically and also provide more efficient reuse of code and faster execution of complex tasks. We particularly liked the error-checking powers of the CLR environment, which reduces run-time errors

What is diffrence between OSQL and Query Analyzer ?

Both are the same but ther eis little diffrence OSQL is command line tool whic is execute qery and display the result same a query analyzer but query analyzer is graphical and OSQL is a command line tool.OSQL have not ability like query analyzer to analyze queries and show statics on speed of execution and other usefull thing about OSQL is that its helps in scheduling.

What is Cascade and Restrict when we use DROP table in SQL SERVER ?

When we are using Drop table in SQL the syntax is simple.
Drop table table_name(CASCADE / RESTRICT)
We use cascade to drop table although it have some dependencies just like triggers,stroeprocrdure,primarykey,foreignkey it will delete first.
But if we use restrict a error message is shown on using of DROP if the table have relation Trigger,storeprocedure.

Jun 3, 2008

How to know which index a table is using?

SELECT table_name,index_name FROM user_constraints

Can SQL Servers linked to other servers like Oracle?

SQL Server can be lined to any server provided it has OLE-DB provider from Microsoft to allow a link.
E.g. Oracle has a OLE-DB provider for oracle that Microsoft provides to add it as linked server to SQL Server group.

Can we rewrite subqueries into simple select statements or with joins?

Subqueries can often be re-written to use a standard outer join, resulting in faster performance. As we may know, an outer join uses the plus sign (+) operator to tell the database to return all non-matching rows with NULL values. Hence we combine the outer join with a NULL test in the WHERE clause to reproduce the result set without using a sub-query.

May 29, 2008

How do you load large data to the SQL server database?

BulkCopy is a tool used to copy huge amount of data from tables. BULK INSERT command helps to Imports a data file into a database table or view in a user-specified format.