In which scenarios does SQL Server ROW_NUMBER() not start from 1?

Row_number always starts with one Returns the sequential number of a row within a partition of a result set, starting at 1 for the first row in each partition You are doing a select top without an order by clause. That means that you have no control over what rows are returned. You are probably getting a different execution plans that use different indexes to get the rows.

The top 100 rows in one plan is not the same top 100 in another plan. Add a relevant order by to the query in the CTE or you can remove the top clause since you are filtering rows in the main query anyway.

Row_number always starts with one. Returns the sequential number of a row within a partition of a result set, starting at 1 for the first row in each partition. You are doing a select top without an order by clause.

That means that you have no control over what rows are returned. You are probably getting a different execution plans that use different indexes to get the rows. The top 100 rows in one plan is not the same top 100 in another plan.

Add a relevant order by to the query in the CTE or you can remove the top clause since you are filtering rows in the main query anyway.

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