mirror of
https://github.com/MariaDB/server.git
synced 2025-01-19 05:22:25 +01:00
58a52a2a84
sql/filesort.cc: Snippet of filesort() code moved to function reuse_freed_buff() - change buffpek pointers to use buff from freed BUFFPEK Used in filesort() and merge_walk(). sql/item_sum.cc: Implementation of Item_sum_sum_distinct - SUM(DISTINCT) item, which uses Unique to resolve duplicates sql/item_sum.h: New sum Item added - Item_sum_sum_distinct - for SUM(DISTINCT) function sql/sql_class.h: added walk() and reset() methods to Unique, used in Item_sum_sum_distinct. sql/sql_sort.h: declaration for reuse_freed_buff() to be able to use it in uniques.cc sql/sql_yacc.yy: parser extended to handle MIN(DISTICNT), MAX(DISTINCT), SUM(DISTINCT) sql/uniques.cc: Implementation for Unique::reset(), Unique::walk() as well as for merge_walk() algorithm.
203 lines
4.8 KiB
Text
203 lines
4.8 KiB
Text
DROP TABLE IF EXISTS t1;
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CREATE TABLE t1 (
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id INTEGER NOT NULL PRIMARY KEY AUTO_INCREMENT,
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gender CHAR(1),
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name VARCHAR(20)
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);
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SELECT SUM(DISTINCT LENGTH(name)) s1 FROM t1;
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s1
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NULL
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INSERT INTO t1 (gender, name) VALUES (NULL, NULL);
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INSERT INTO t1 (gender, name) VALUES (NULL, NULL);
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INSERT INTO t1 (gender, name) VALUES (NULL, NULL);
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SELECT SUM(DISTINCT LENGTH(name)) s1 FROM t1;
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s1
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NULL
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INSERT INTO t1 (gender, name) VALUES ('F', 'Helen'), ('F', 'Anastasia'),
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('F', 'Katherine'), ('F', 'Margo'), ('F', 'Magdalene'), ('F', 'Mary');
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CREATE TABLE t2 SELECT name FROM t1;
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SELECT (SELECT SUM(DISTINCT LENGTH(name)) FROM t1) FROM t2;
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(SELECT SUM(DISTINCT LENGTH(name)) FROM t1)
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18
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18
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18
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18
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18
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18
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18
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18
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18
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DROP TABLE t2;
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INSERT INTO t1 (gender, name) VALUES ('F', 'Eva'), ('F', 'Sofia'),
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('F', 'Sara'), ('F', 'Golda'), ('F', 'Toba'), ('F', 'Victory'),
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('F', 'Faina'), ('F', 'Miriam'), ('F', 'Beki'), ('F', 'America'),
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('F', 'Susan'), ('F', 'Glory'), ('F', 'Priscilla'), ('F', 'Rosmary'),
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('F', 'Rose'), ('F', 'Margareth'), ('F', 'Elizabeth'), ('F', 'Meredith'),
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('F', 'Julie'), ('F', 'Xenia'), ('F', 'Zena'), ('F', 'Olga'),
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('F', 'Brunhilda'), ('F', 'Nataly'), ('F', 'Lara'), ('F', 'Svetlana'),
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('F', 'Grethem'), ('F', 'Irene');
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SELECT
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SUM(DISTINCT LENGTH(name)) s1,
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SUM(DISTINCT SUBSTRING(NAME, 1, 3)) s2,
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SUM(DISTINCT LENGTH(SUBSTRING(name, 1, 4))) s3
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FROM t1;
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s1 s2 s3
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42 0 7
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SELECT
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SUM(DISTINCT LENGTH(g1.name)) s1,
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SUM(DISTINCT SUBSTRING(g2.name, 1, 3)) s2,
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SUM(DISTINCT LENGTH(SUBSTRING(g3.name, 1, 4))) s3
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FROM t1 g1, t1 g2, t1 g3;
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s1 s2 s3
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42 0 7
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SELECT
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SUM(DISTINCT LENGTH(g1.name)) s1,
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SUM(DISTINCT SUBSTRING(g2.name, 1, 3)) s2,
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SUM(DISTINCT LENGTH(SUBSTRING(g3.name, 1, 4))) s3
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FROM t1 g1, t1 g2, t1 g3 GROUP BY LENGTH(SUBSTRING(g3.name, 5, 10));
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s1 s2 s3
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42 0 NULL
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42 0 7
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42 0 4
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42 0 4
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42 0 4
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42 0 4
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42 0 4
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SELECT SQL_BUFFER_RESULT
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SUM(DISTINCT LENGTH(name)) s1,
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SUM(DISTINCT SUBSTRING(NAME, 1, 3)) s2,
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SUM(DISTINCT LENGTH(SUBSTRING(name, 1, 4))) s3
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FROM t1;
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s1 s2 s3
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42 0 7
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SELECT SQL_BUFFER_RESULT
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SUM(DISTINCT LENGTH(g1.name)) s1,
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SUM(DISTINCT SUBSTRING(g2.name, 1, 3)) s2,
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SUM(DISTINCT LENGTH(SUBSTRING(g3.name, 1, 4))) s3
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FROM t1 g1, t1 g2, t1 g3 GROUP BY LENGTH(SUBSTRING(g3.name, 5, 10));
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s1 s2 s3
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42 0 NULL
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42 0 7
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42 0 4
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42 0 4
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42 0 4
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42 0 4
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42 0 4
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SET @l=1;
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UPDATE t1 SET name=CONCAT(name, @l:=@l+1);
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SELECT SUM(DISTINCT RIGHT(name, 1)) FROM t1;
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SUM(DISTINCT RIGHT(name, 1))
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45
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SELECT SUM(DISTINCT id) FROM t1;
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SUM(DISTINCT id)
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703
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SELECT SUM(DISTINCT id % 11) FROM t1;
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SUM(DISTINCT id % 11)
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55
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DROP TABLE t1;
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CREATE TABLE t1 (id INTEGER);
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CREATE TABLE t2 (id INTEGER);
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INSERT INTO t1 (id) VALUES (1), (1), (1),(1);
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INSERT INTO t2 (id) SELECT id FROM t1;
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INSERT INTO t1 (id) SELECT id FROM t2;
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/* 8 */
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INSERT INTO t1 (id) SELECT id FROM t2;
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/* 12 */
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INSERT INTO t1 (id) SELECT id FROM t2;
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/* 16 */
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INSERT INTO t1 (id) SELECT id FROM t2;
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/* 20 */
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INSERT INTO t1 (id) SELECT id FROM t2;
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/* 24 */
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DELETE FROM t2;
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INSERT INTO t2 (id) SELECT id+1 FROM t1;
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INSERT INTO t1 SELECT id FROM t2;
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DELETE FROM t2;
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INSERT INTO t2 (id) SELECT id+2 FROM t1;
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INSERT INTO t1 SELECT id FROM t2;
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DELETE FROM t2;
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INSERT INTO t2 (id) SELECT id+4 FROM t1;
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INSERT INTO t1 SELECT id FROM t2;
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DELETE FROM t2;
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INSERT INTO t2 (id) SELECT id+8 FROM t1;
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INSERT INTO t1 SELECT id FROM t2;
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DELETE FROM t2;
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INSERT INTO t2 (id) SELECT id+16 FROM t1;
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INSERT INTO t1 SELECT id FROM t2;
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DELETE FROM t2;
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INSERT INTO t2 (id) SELECT id+32 FROM t1;
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INSERT INTO t1 SELECT id FROM t2;
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DELETE FROM t2;
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INSERT INTO t2 (id) SELECT id+64 FROM t1;
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INSERT INTO t1 SELECT id FROM t2;
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DELETE FROM t2;
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INSERT INTO t2 (id) SELECT id+128 FROM t1;
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INSERT INTO t1 SELECT id FROM t2;
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DELETE FROM t2;
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INSERT INTO t2 (id) SELECT id+256 FROM t1;
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INSERT INTO t1 SELECT id FROM t2;
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DELETE FROM t2;
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INSERT INTO t2 (id) SELECT id+512 FROM t1;
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INSERT INTO t1 SELECT id FROM t2;
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DELETE FROM t2;
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INSERT INTO t2 (id) SELECT id+1024 FROM t1;
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INSERT INTO t1 SELECT id FROM t2;
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DELETE FROM t2;
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INSERT INTO t2 (id) SELECT id+2048 FROM t1;
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INSERT INTO t1 SELECT id FROM t2;
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DELETE FROM t2;
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INSERT INTO t2 (id) SELECT id+4096 FROM t1;
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INSERT INTO t1 SELECT id FROM t2;
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DELETE FROM t2;
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INSERT INTO t2 (id) SELECT id+8192 FROM t1;
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INSERT INTO t1 SELECT id FROM t2;
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DELETE FROM t2;
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INSERT INTO t2 SELECT id FROM t1 ORDER BY id*rand();
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SELECT SUM(DISTINCT id) sm FROM t1;
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sm
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134225920
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SELECT SUM(DISTINCT id) sm FROM t2;
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sm
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134225920
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SELECT SUM(DISTINCT id) sm FROM t1 group by id % 13;
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sm
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10327590
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10328851
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10330112
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10331373
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10332634
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10317510
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10318770
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10320030
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10321290
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10322550
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10323810
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10325070
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10326330
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SET max_heap_table_size=16384;
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SHOW variables LIKE 'max_heap_table_size';
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Variable_name Value
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max_heap_table_size 16384
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SELECT SUM(DISTINCT id) sm FROM t1;
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sm
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134225920
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SELECT SUM(DISTINCT id) sm FROM t2;
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sm
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134225920
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SELECT SUM(DISTINCT id) sm FROM t1 GROUP BY id % 13;
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sm
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10327590
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10328851
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10330112
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10331373
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10332634
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10317510
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10318770
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10320030
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10321290
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10322550
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10323810
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10325070
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10326330
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DROP TABLE t1;
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DROP TABLE t2;
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