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Powershell. SQL Query. How to determine if a query returns no results?

I’ve created a script that monitors a table in a SQL Server database. I’m only interested in one column in the table: TimeStamp. If the maximum (newest) value in TimeStamp is more than 30 minutes ...
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MySQL way to select latest timestamp per device?

</pre> <BR><BR>I need a query that will return 16 values, one for each different RACKNO in the database.<BR><BR>It would select the rows that have the maximum timestamp value for each distinct ...