我有这样的表:
Year Month Item val1 val2 val3
2011 1 A 86
2011 1 B 17
2012 2 B 10
2012 2 C 1
2013 3 A 82
2013 3 B 89
2011 1 A 59
2011 1 B 75
2012 2 B 26
2012 2 C 77
2013 3 A 62
2013 3 B 78
2011 1 A 70
2011 1 B 17
2012 2 B 15
2012 2 C 20
2013 3 A 62
2013 3 B 43
我希望看起来像这样:
Year Month Item val1 val2 val3
2011 1 A 86 59 70
2011 1 B 17 75 17
2012 2 B 10 26 15
2012 2 C 1 77 20
2013 3 A 82 62 62
2013 3 B 89 78 43
我尝试这样的查询:
select year,month,item,val1,val2,val3 from table
group by year,month,item
但它不起作用 有人可以帮帮我吗?感谢
答案 0 :(得分:1)
尝试类似于某些聚合函数的内容:
select year,month,item,
MAX(COALESCE(val1,0)) as val1,MAX(COALESCE(val2,0)) as val2,MAX(COALESCE(val3,0)) as val3 from table
group by year,month,item