thanks to you both.
but the result is still in one row and not in one column.
so, if I try to use your tip, I'll get the following outcome:
_time | max(NumberResourceMailBoxes) | max(NumberSharedMailBoxes) | max(Number AnitvirusPositive)
2017-07 | 123 | 3456 | 8797
2017-08 | 111 | 222 | 3333
but I want to have it like this:
_time | Description | Value
2017-07 | max(NumberResourcemailBoxes) | 123
2017-07 | max(NumberSharedMailBoxes) | 3456
2017-07 | max(NumberAntivirusPositive) | 8797
......
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