Example and Notes
Use this SQL Server example as a starting point for development, troubleshooting, reporting, or maintenance work. Review it against your schema, data volume, permissions, and SQL Server version before using it in production.
The builtin APPROX_COUNT_DISTINCT function returns the approximate number of unique non-null values in a group. The code below will show you how to use the APPROX_COUNT_DISTINCT function. For more details on the APPROX_COUNT_DISTINCT function click here
SELECT APPROX_COUNT_DISTINCT(Client_Number) As DistinctCount FROM CLIENT
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