task_name start_time value
acc_clock 2010-05-27 4
icc_opy 2010-05-28 5
icc_dtaf 2010-05-29 3
acc_clock 2010-05-25 34
icc_ruty 2010-05-23 33
icc_ruty 2010-05-22 45
task_name start_time value
a
阅读背景：
How to use max and group by statement on my SQL query?
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