MySQL组由同一列中的不同值组成

Question

我想按年份对输出进行分组，以便有2行。在2019年排成一排，在2020年排成一排。甚至有可能吗？是否有类似的输出变体？

这是我的代码：

select count(*)
     , leirueck 
  from ausleihe 
 where leirueck between "2019-02-01" and "2019-02-10" 
    or leirueck between "2020-02-01" and "2020-02-10" 
 group  
    by leirueck 

And here the output

Answer 1

如果使用mysql year()函数在日期字段中按年份分组，则>

select count(*)
     , year(leirueck)
  from ausleihe 
 where leirueck between "2019-02-01" and "2019-02-10" 
    or leirueck between "2020-02-01" and "2020-02-10" 
 group  
    by year(leirueck)