英['hævɪŋ] 美['hævɪŋ]
n.所有，持有
v.有( have的現在分詞);（親屬關係中）接受;拿;買
mysql HAVING語句 語法
作用：在 SQL 中增加 HAVING 子句原因是，WHERE 關鍵字無法與合計函數一起使用。
語法：SELECT column_name, aggregate_function(column_name) FROM table_name WHERE column_name operator value GROUP BY column_name HAVING aggregate_function(column_name) BY column_name HAVING aggregate_function(column_name) operator value#。