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Wednesday, April 12, 2006

Generating test data that matches existing data

I've had to create test data a number of times, including data for tables that had mandatory foreign keys to existing tables. It was not feasible to just create new master rows for my test data; I wanted to refer to a random sample of existing data; but the code that generates the test data had to perform reasonably well, even though it had to pick out some random values from a very large table.

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