Besides executing SQL commands, system administrators can check running status, add/drop user accounts and manage the running instances. TAOS CLI with client driver can be installed and run on either Linux or Windows machines. For more details on CLI, please [check here](../reference/taos-shell/).
Besides executing SQL commands, system administrators can check running status, add/drop user accounts and manage the running instances. TDengine CLI with client driver can be installed and run on either Linux or Windows machines. For more details on CLI, please [check here](../reference/taos-shell/).
In a time-series application, there may be multiple kinds of data collection points. For example, in the electrical power system there are meters, transformers, bus bars, switches, etc. For easy and efficient aggregation of multiple tables, one STable needs to be created for each kind of data collection point. For example, for the meters in [table 1](/tdinternal/arch#model_table1), the SQL statement below can be used to create the super table.
In a time-series application, there may be multiple kinds of data collection points. For example, in the electrical power system there are meters, transformers, bus bars, switches, etc. For easy and efficient aggregation of multiple tables, one STable needs to be created for each kind of data collection point. For example, for the meters in [table 1](/concept/#model_table1), the SQL statement below can be used to create the super table.
```sql
```sql
CREATE STable meters (ts timestamp, current float, voltage int, phase float) TAGS (location binary(64), groupId int);
CREATE STable meters (ts timestamp, current float, voltage int, phase float) TAGS (location binary(64), groupId int);
TAOS_RES*pRes=taos_query(pConn,"select NOW() from (select * from regular_table_2 where tbname in ('regular_table_2_1') and q_bigint <= 9223372036854775807 and q_tinyint <= 127 and q_bool in ( true , false) ) order by ts;");
TAOS_RES* pRes = taos_query(pConn, "insert into tu(ts) values('2022-02-27 12:12:61')");
taos_query_a(pConn,"select HYPERLOGLOG(q_ts) from stable_1_2 where ts between 1630000001000 and 1630100001000 interval(19d) Fill(NONE);",queryCallback,pConn);
