在mysql中分组和计数

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。它必须只在sql中完成。这是一个例子：

我有下表：

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

并希望得到这样的结果：

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

Answer 1

您可以按字词分组，然后根据制作的群组进行求和....

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

当您必须根据freq订购单词时，您可以按以下方式使用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;