SQL中的HAVING子句规定：SELECT语句仅返回聚合值（aggregate values）满足指定条件的行。
外部链接
*[http://www.databasejournal.com/features/mysql/article.php/3469351 The HAVING and GROUP BY SQL clauses]
*[https://www.w3schools.com/sql/sql_functions.asp SQL Aggregate Functions]
SQL中的HAVING子句规定：SELECT语句仅返回聚合值（aggregate values）满足指定条件的行。
外部链接
*[http://www.databasejournal.com/features/mysql/article.php/3469351 The HAVING and GROUP BY SQL clauses]
*[https://www.w3schools.com/sql/sql_functions.asp SQL Aggregate Functions]
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