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Functions of esProc/R/Python/Perl in Structured Data Process by Comparison :Chapter 14.Group

esProc

esProc provides a variety of grouping functions, by which, the grouping and aggregation processes can be performed by two steps or by one step. In the normal conditions, the grouping can be done by the column, expression, or by the rule of enumeration. 862 more words

EsProc

MySQL :: MySQL 3.23, 4.0, 4.1 Reference Manual :: 3.3.4.8 Counting Rows

การใช้ COUNT และ GROUP BY

SELECT COUNT(*) FROM pet;

SELECT owner, COUNT(*) FROM pet GROUP BY owner;

MySQL :: MySQL 3.23, 4.0, 4.1 Reference Manual :: 3.3.4.8 Counting Rows.

MySQL