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Tip of the Day
Language: VB4,VB5,VB6
Expertise: beginner
Apr 29, 2000



Application Security Testing: An Integral Part of DevOps

Avoid error 1540 in Join queries

When you plan your queries, you should avoid the use of wildcard keyword * - which means "retrieve any field" - mainly because it may decrease performances, since the engine allocates space for the entire row; use explicit field declaration instead, such as:
SELECT field1, field2 FROM table1
Moreover, consider the row length limit when you handle ordered queries; an apparently painless query like this:
SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.id ORDER BY table2.field1
may return error 1540, if the result row length is more than 8096 bytes.
Francesco Martire
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