SELECT WITH ROLLUP
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Contents
Syntax
See SELECT for the full syntax.
Description
The WITH ROLLUP
modifer adds extra rows that represent super-aggregate summaries to the resultset.
Examples
These examples use the following sample table
CREATE TABLE booksales ( country VARCHAR(35), genre ENUM('fiction','non-fiction'), year YEAR, sales INT); INSERT INTO booksales VALUES ('Senegal','fiction',2014,12234), ('Senegal','fiction',2015,15647), ('Senegal','non-fiction',2014,64980), ('Senegal','non-fiction',2015,78901), ('Paraguay','fiction',2014,87970), ('Paraguay','fiction',2015,76940), ('Paraguay','non-fiction',2014,8760), ('Paraguay','non-fiction',2015,9030);
The addition of the WITH ROLLUP
modifier in this example adds an extra row that aggregates both years:
SELECT year, SUM(sales) FROM booksales GROUP BY year; +------+------------+ | year | SUM(sales) | +------+------------+ | 2014 | 173944 | | 2015 | 180518 | +------+------------+ 2 rows in set (0.08 sec) SELECT year, SUM(sales) FROM booksales GROUP BY year WITH ROLLUP; +------+------------+ | year | SUM(sales) | +------+------------+ | 2014 | 173944 | | 2015 | 180518 | | NULL | 354462 | +------+------------+
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