Question

我有一个像

这样的查询

select SUM(*) as "tot1" from table1 t, table2 t2 where t1.id=t2.id and t1.column=1

select SUM(*) as "tot2" from table1 t, table2 t2 where t1.id=t2.id and t1.column=2

select SUM(*) as "tot3" from table1 t, table2 t2 where t1.id=t2.id and t1.column=3

我希望查询结果看起来像这样

 tot1     tot2     tot3

 500       600      3

这甚至可能吗？或者是否有任何替代解决方案让我在同一个表中查看这些查询。

Answer 1

试试这个：

select * from 
(select SUM(*) as "tot1" from table1 t, table2 t2 where t1.id=t2.id and t1.column=1) a,

(select SUM(*) as "tot2" from table1 t, table2 t2 where t1.id=t2.id and t1.column=2) b,

(select SUM(*) as "tot3" from table1 t, table2 t2 where t1.id=t2.id and t1.column=3) c

Answer 2

尝试此查询

select 
    SUM(CASE t1.column WHEN 1 THEN t1.column ELSE 0 END) as tot1, 
    SUM(CASE t1.column WHEN 2 THEN t1.column ELSE 0 END) as tot2, 
    SUM(CASE t1.column WHEN 3 THEN t1.column ELSE 0 END) as tot3 
from 
    table1 t, table2 t2 
where 
    t1.id=t2.id

Answer 3

试试这个：

选择SUM（t1.column = 1）为“tot1”，SUM（t1.column = 2）为“tot2”，将SUM（t1.column =）表示为来自table1 t的“tot3”，table2 t2，其中t1.id = t2.id

添加新列SQL查询

3 个答案: