其他列的MySql Group By和Sum总值

Question

我有两列像这样

我希望结果是狗6和大象2.我到目前为止所做的（并且失败了）是

  

SELECT word，SUM（amount）FROM Data Group By'word'

Answer 1

删除WORD周围的单引号。它会导致列名称转换为字符串。

SELECT word, SUM(amount) 
FROM Data 
Group By word

Answer 2

它应该是grave accent符号而不是single quote：

SELECT word, SUM( amount )
FROM Data
GROUP BY `word`;

<强> 输出：

word     SUM(amount)
dog           6
Elephant      2

Answer 3

SELECT word, SUM(amount) FROM Data Group By word;

Answer 4

尝试这种非常规方法。

SELECT word, SUM(amount) 
FROM Data 
Group By word

Answer 5

SELECT column_name1, SUM(column_name2) 
FROM table_name 
GROUP BY column_name1