请用sql语句将下列表格:
变为表格2
sql语句如下:
select year, round(max(if(mounth=1,amount,0)),2) m1, # 将值赋给m1 round(max(if(mounth=2,amount,0)),2) m2 from jj group by year;
# sql语句中的if(mounth=1,amount,0)表示如果mounth=1则取amount值否则取0
请用sql语句将下列表格:
变为表格2
sql语句如下:
select year, round(max(if(mounth=1,amount,0)),2) m1, # 将值赋给m1 round(max(if(mounth=2,amount,0)),2) m2 from jj group by year;
# sql语句中的if(mounth=1,amount,0)表示如果mounth=1则取amount值否则取0