Tip

Sampling data via SQL

Did you ever want to sample some records from your file? For instance, you want to just see or work with every 10th record. Using SQL and some of its functions, you can do just that. Using the Mod and RRN functions you can select your sample. Just use the number as the second argument in the Mod function for the nth value. Mod returns the remainder so if the remainder is 0, you have the desired record.

SELECT PART#, DESC, PRICE FROM ITEMS WHERE MOD(RRN(ITEMS),10)=0

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This was first published in October 2001

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