What is wrong with 'SELECT *'? - Database Source Code in ASP

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Home » ASP Home » Database Home » What is wrong with 'SELECT *'?

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Title	*What is wrong with 'SELECT '?**
Description
Category	ASP » Database
Hits	386331
Code	Select and Copy the Code
SELECT * is inefficient, particularly when you are only using a few of the columns in the table. This is because it actually makes TWO queries to the database: before it runs your query, it has to query the system tables to determine the name and datatypes of the columns. It is much more efficient to NAME your columns in the SQL query, and this will also help in having your column names right there... so you don't have to keep flipping back and forth between ASP page and database. In addition, this will prevent ambiguous column names in your resultset (in the case where both are all tables in the JOIN statement have columns with the same name). And finally, here's another reason to avoid SELECT * : Memo/Text columns, as well as columns containing BLOB data. Microsoft recommends to put BLOB/text columns at the end of the SELECT statement, in order of appearance in the table. This is also applicable to VARCHAR columns in SQL Server with a length greater than 255 characters.

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