query_sql=f'select * from {tb_name} where ts > "2021-01-03 12:00:00" and c1 != 2 and c2 >= 2 and c3 <> 4 and c4 < 4 and c5 > 1 and c6 >= 1.1 and c7 is not Null and c8 = "nchar" and c9=false'
query_sql=f'select {select_elm} from {tb_name} where ts > "2021-01-03 12:00:00" and c1 != 2 and c2 >= 2 and c3 <> 4 and c4 < 4 and c5 > 1 and c6 >= 1.1 and c7 is not Null and c8 = "nchar" and c9=false'