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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How To Split column In SQL

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Suppose you have a column in a table that has multiple pieces of information in it that
I need to break out into various columns. The column is random but the
values I need to separate out are the number and the UN number as below:

245 HELIUM, COMPRESSED 2.2 UN1046


I need to separate the 2.2 and the UN1046 into different columns. How do I
parse this?
CREATE TABLE Inventory (ItemDescription VARCHAR(99))
INSERT Inventory VALUES ('245 HELIUM, COMPRESSED 2.2 UN1046' )
INSERT Inventory VALUES ('24adada5 HELIsadasdadUM, sdsdsd 6.6 UN99' )
INSERT Inventory VALUES ('24adada5 HELIsadasdadUM, sdsdsd 446.6777 UN9988888' )
INSERT Inventory VALUES ('24adada5 HEdUM, sdsdsd 446.0 UN9988' )


SELECT RIGHT(ItemDescription,PATINDEX('% %',
REVERSE(ItemDescription))-1) AS COL1,
LTRIM(REVERSE(LEFT(REVERSE(LEFT(ItemDescription,(LEN(ItemDescription)-PATINDEX('% %', REVERSE(ItemDescription))))),
PATINDEX('% %',REVERSE(LEFT(ItemDescription,(LEN(ItemDescription)-PATINDEX('% %', REVERSE(ItemDescription)))))))))
AS COL2
FROM Inventory

Comments

Anonymous said…
it was a big help...
September 24, 2009 at 12:57 PM
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