SQL SELECT COUNT - SQL Tutorial – Learn SQL Online | MS SQL Server, Oracle, mySQL

SQL SELECT COUNT - SQL Tutorial – Learn SQL Online | MS SQL Server, Oracle, mySQL

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日期:2025-06-10
The SQL COUNT function returns the number of rows in a query. NULL value will not be counted. SQL COUNT Syntax SELECT COUNT(expression) AS resultName FROM tableName WHERE conditions The expression can be *, column name or DISTINCT column ......看更多