19 lines
776 B
Plaintext
19 lines
776 B
Plaintext
#owner: dachuan.sdc
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#owner group: SQL3
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# tags: optimizer
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# test aggregation
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--source mysql_test/test_suite/px/include/exam_data.inc
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# 计算全年级平均分，最高分，最低分
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explain select /*+ USE_PX parallel(2) */ subject, avg(score), max(score), min(score) from score group by subject;
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--sorted_result
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select /*+ USE_PX parallel(2) */ subject, avg(score), max(score), min(score) from score group by subject;
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# 计算各个班级平均分，最高分，最低分
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explain select /*+ 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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--sorted_result
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select /*+ 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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