Web Reference: Jan 20, 2026 ยท COUNT(*) doesn't require an expression parameter because by definition, it doesn't use information about any particular column. COUNT(*) returns the number of rows in a specified table, and it preserves duplicate rows. It counts each row separately, including rows that contain null values. This tutorial shows you how to use the SQL Server COUNT () aggregate function to count values in a set of values. The COUNT() function returns the number of rows that matches a specified criterion. The behavior of COUNT() depends on the argument used within the parentheses: COUNT(*) - Counts the total number of rows in a table (including NULL values). COUNT(columnname) - Counts all non-null values in the column.
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