Select the TDengine data type and input the query statement, such as querying server CPU utilization as shown below:

Query the maximum memory usage percentage in the last hour SELECT MAX(used_percent) FROM telegraf.mem WHERE _ts > NOW - 1h;

Query the lowest memory availability percentage in the last 30 minutes SELECT _ts, MIN(available_percent) FROM telegraf.mem WHERE _ts > NOW - 30m GROUP BY _ts ORDER BY MIN(available_percent) ASC LIMIT 1;

Query the top 10 memory usage data points SELECT _ts, used, available_percent FROM telegraf.mem ORDER BY _ts DESC LIMIT 10;