June 2010
Intermediate to advanced
328 pages
7h 51m
English
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How to Recognize the Antipattern
In most brands of database, writing a query that violates the Single-Value Rule should elicit an error immediately as you prepare the query. The following are examples of error messages given by some brands of database:
-
Firebird 2.1:
Invalid expression in the select list (not contained in either an aggregate function or the GROUP BY clause) -
IBM DB2 9.5:
An expression starting with "BUG_ID" specified in a SELECT clause, HAVING clause, or ORDER BY clause is not specified in the GROUP BY clause or it is in a SELECT clause, HAVING clause, or ORDER BY clause with a column function and no GROUP BY clause is specified. -
Microsoft SQL Server 2008:
Column 'Bugs.bug_id' ...
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