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我正在尝试做一个简单的查询,它将计算数据库表中每个公司的评论数量,如下所示按名称分组
例如评论表
id company_id review 1 1 Great 2 1 Ok 3 1 Bad 4 2 Nice
所以这将返回公司 id 1 和 3,公司 id 2 和 1。关于最简单解决方案的任何想法
select company_id, count(company_id) from tablename group by company_id
尝试
SELECT company_id,Count(1) FROM reviews GROUP BY company_Id;