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Oracle in a Nutshell
book

Oracle in a Nutshell

by Rick Greenwald, David C. Kreines
December 2002
Intermediate to advanced content levelIntermediate to advanced
928 pages
85h 29m
English
O'Reilly Media, Inc.
Content preview from Oracle in a Nutshell

COVAR_POP

COVAR_POP (expr1,expr2) [OVER (analytic_clause)]

Computes the population covariance of a set of number pairs provided by expr1 and expr2. Both expr1 and expr2 must return numbers. After eliminating pairs of exp1 and exp2 where either is NULL, Oracle makes the following calculation.

(SUM (expr1 * expr2) - SUM (expr2) * SUM (expr1) / n) / n

where n is the number of rows returned.

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Publisher Resources

ISBN: 0596003366Errata Page