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並前往https://www.geeksforgeeks.org/sql-using-group-by-to-count-the-number-of-rows-for-each-unique-entry-in-a-column/

SQL - Using GROUP BY to COUNT the Number of Rows For ...

COUNT (column_name) counts non-NULLs only in the specified column name. Syntax(count all rows): SELECT COUNT(*) FROM table_name;. Query: SELECT ...

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