sql中查询同一列所有值出现的次数
https://blog.csdn.net/love_java_cc/article/details/52234889
1 | SELECT country as 国家,COUNT(*) as 次数 FROM table3 GROUP BY country |
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https://blog.csdn.net/love_java_cc/article/details/52234889
1 | SELECT country as 国家,COUNT(*) as 次数 FROM table3 GROUP BY country |