某服装租赁公司数据库包含三个关系:服装(服装编号,服装名,租金,类名)会员(会员编号,会员名,年龄,所在区,联系电话)租借(服装编号,会员编号,租赁日期,归还日期)实现下列操作:使用SQL语句查询每个相同类别的类名及服装数量。
SELECT 类名, COUNT(*) FROM 服装 GROUP BY 类名;
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