oceanbase
17 строк · 776.0 Байт
1#owner: dachuan.sdc
2#owner group: SQL3
3# tags: optimizer
4
5# test aggregation
6
7--source mysql_test/test_suite/px/include/exam_data.inc
8
9# 计算全年级平均分,最高分,最低分
10explain select /*+ USE_PX parallel(2) */ subject, avg(score), max(score), min(score) from score group by subject;
11--sorted_result
12select /*+ USE_PX parallel(2) */ subject, avg(score), max(score), min(score) from score group by subject;
13
14# 计算各个班级平均分,最高分,最低分
15explain select /*+ USE_PX parallel(2) */ cls, subject, avg(score), max(score), min(score) from score join stu using (sid) group by cls, subject;
16--sorted_result
17select /*+ USE_PX parallel(2) */ cls, subject, avg(score), max(score), min(score) from score join stu using (sid) group by cls, subject;
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