SQL Server Developer
When opening a SSIS package you may receive the following error: Unable to instantiate XML DOM document, please verify that MSXML binaries are properly installed and registered. Solution This error is caused by an issue with the MSXML installation. Reinstalling or repairing of MSXML6 will solve the above problem.
In SQL Server 2000 Reporting Services the reports can be exported to other data formats such as Excel. This feature is available with a simple configuration as HTML link call on Reporting Services to export the data to Excel for other users purpose. Sometimes the user might find it difficult to achieve consistency between a […]
This is a quite common question. It is usually asked by people arriving at SQL Server with a background in Microsoft Access. They either want to use SQL Server as a backend for their Access project, or they are otherwise upsizing from Access to SQL Server. The answer, however, is usually not much appreciated at […]
Before we actually look at the answer, let’s recall some basics of the IDENTITY property and SQL Server’s numerical data types. You can define the IDENTITY property on columns of the INT data type and on DECIMAL with scale 0. This gives you a range of: TINYINT 0 – 255 SMALLINT -32.768 – 32.767 INT […]
Is it a good practice to use SQL Server stored procedures for INSERT, UPDATE, and DELETE statements?
Yes, anytime you pass a data modification request from a front-end application to SQL Server, it is a best practice to encapsulate the code in a stored procedure. Here are some of the reasons why: It is faster than using ADO methods to accomplish the same task. Network traffic can often be reduced because less […]
First of all, you should refrain from messing around with SQL Server’s system tables, unless you are told to and are guided by Microsoft. You are running an unsupported system if you modify the system tables! But if you don’t want to listen to the above advice, why would one want to create a trigger […]
What is meant here is the Microsoft Access feature to create unique indexes on columns that can contain two or more NULLs. SQL Server does not allow a duplicate entry in an index that is created as UNIQUE. Consider this: CREATE TABLE Table1 (cID INT PRIMARY KEY , c1 INT NULL) CREATE UNIQUE NONCLUSTERED INDEX […]
Actually, this question can be extended to: How can you create a custom ORDER BY. But let’s first have a look at the following query:USE PUBSGOSELECT title_id, type, price, royaltyFROMtitlesORDER BYroyaltytitle_id type price royalty ——– ———— ——————— ———– MC3026 UNDECIDED NULL NULLPC9999 popular_comp NULL NULLPS1372 psychology 21.5900 10BU1032 business 19.9900 10BU1111 business 11.9500 10BU7832 business […]
According to SQL Server’s Books Online (BOL), the ISNUMERIC() function an easy and convenient way to determine whether an given expression can be evaluate as one of SQL Server’s valid numeric data types. These are INTEGER, FLOAT (REAL), DECIMAL (NUMERIC) and MONEY.Now, unfortunately, this function is buggy and can easily be fooled. Consider this:SELECTISNUMERIC(‘€+,.’), ISNUMERIC(’1d2′), […]
Consider the Pubs sample database. Our task is to determine the third, but last date when one employee joined the company. Several approaches are possible here. Let’s first have a look at the different methods available to us, before getting into a basic performance analysis. 1) Using TOP. This is probably the most intuitive […]