mysql - mysql中的分组和计数

Question

我正在尝试对连续出现的所有单词进行分组，计算它们的频率值并按计数结果排序。它只能在 sql 中完成。这是一个例子：

我有下表：

word | freq
-----------
car  | 5
cake | 2
car  | 4

并希望得到这个结果：

word | freq
-----------
car  | 9
cake | 2

Answer 1

您可以按单词分组，然后根据组进行汇总......

  SELECT word,SUM(freq) AS freq FROM tblName GROUP BY word

当您必须根据频率对单词进行排序时，您可以通过以下方式使用 ORDER BY：

SELECT word,SUM(freq) AS freq FROM tblName GROUP BY word ORDER BY freq DESC

Answer 2

SELECT word, SUM(freq) AS freq FROM yourTable GROUP BY word ORDER BY freq DESC;