taos> select last(col1) from test.meters where t1="shanghai" and ts > '2017-07-14 10;taos> select avg(col1) from test.meters where t1="shanghai" and ts > '2017-07-14 10;taos> select count(*) from test.meters where t1="shanghai" and ts > '2017-07-14 10;taos> select count(*) from test.meters where t1="beijing" or t1="shanghai";● taosd.service - TDengine server service