目录

原始数据：

方式一：

方式二：

方式三：

unpivot的使用：

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原始数据：

方式一：

select t_name,sum(decode(t_item, 'item1', t_num, 0)) item1,sum(decode(t_item, 'item2', t_num, 0)) item2,sum(decode(t_item, 'item3', t_num, 0)) item3,sum(t_num) totalfrom testgroup by t_name;

方式二：

select t_name,sum(casewhen t_item = 'item1' thent_numelse0end) item1,sum(casewhen t_item = 'item2' thent_numelse0end) item2,sum(casewhen t_item = 'item3' thent_numelse0end) item3,sum(t_num) totalfrom testgroup by t_name;

方式三：

 select t.*, (nvl(t.item1, 0) + nvl(t.item2, 0) + nvl(t.item3, 0)) as totalfrom (select *from test pivot(sum(t_num) for t_item in('item1' as item1,'item2' as item2,'item3' as item3))) t;

unpivot的使用：

 select t_name, t_item, t_numfrom (select *from test pivot(sum(t_num) for t_item in('item1' as item1,'item2' as item2,'item3' as item3))) unpivot(t_num for t_item in(item1,item2,item3));