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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

KEEP

                     aggregate_function KEEP (DENSE_RANK {FIRST | LAST} 
        ORDER BY expr [ASC | DESC][NULLS {FIRST | LAST}]
          [, expr [ASC | DESC] [NULLS {FIRST | LAST}]...])
        [OVER (analytic_clause)]

Used in conjunction with another aggregate function (MIN, MAX, SUM, AVG, COUNT, VARIANCE, or STDDEV) to operate on a set of values from a set of rows that rank as the FIRST or LAST rows, as specified by the ORDER BY specification. Expressions must match the positions of those in the ORDER BY clause.

Parameters

aggregate_function

MIN, MAX, SUM, AVG, COUNT, VARIANCE, or STDDEV function.

DENSE RANK

Specifies that aggregation will occur only over those rows with minimum or maximum dense rank.

analytic_clause

Can use only the PARTITION BY portion of the analytic clause.

Common keywords and clauses: ASC, DESC, NULLS FIRST, NULLS LAST.

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Publisher Resources

ISBN: 0596003366Errata Page