添加新列SQL查詢

Question

我有一個查詢

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

我希望查詢結果看起來像這樣

 tot1     tot2     tot3

 500       600      3

這有可能嗎？ 還是有其他替代解決方案供我在同一表格中查看這些查詢。

Answer 1

嘗試這個：

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

試試這個查詢

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

嘗試這個：

從表1 t，表2 t2中選擇SUM（t1.column = 1）作為“ tot1”，選擇SUM（t1.column = 2）作為“ tot2”，將SUM（t1.column =）作為“ tot3”，其中t1.id = t2 。ID