June 2010
Intermediate to advanced
328 pages
7h 51m
English
Content preview from SQL Antipatterns
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Chapter 23See No Evil
It is a capital mistake to theorize before you have all the evidence.
Sherlock Holmes
“I found another bug in your product,” the voice on the phone said.
I got this call while working as a technical support engineer for an SQL RDBMS in the 1990s. We had one customer who was well-known for making spurious reports against our database. Nearly all of his reports turned out to be simple mistakes on his part, not bugs.
“Good morning, Mr. Davis. Of course, we’d like to fix any problem you find,” I answered. “Can you tell me what happened?”
“I ran a query against your database, and nothing came back.” Mr. Davis said sharply. “But I know the data is in the database—I can verify it in a test script.”
“Was there any problem ...
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