How can I see the rowcounts for tables in a log analytics workspace?

 The following query returns table names and row counts for all tables with at least one row for the time range selected.

union withsource=sourceTable *
| project sourceTable
| summarize count() by sourceTable

from : https://stackoverflow.com/questions/56706816/how-can-i-see-the-rowcounts-for-tables-in-a-log-analytics-workspace