如何将两个以上的 select 查询合并到 oracle 中的单个结果集中

Question

我需要将四个查询的结果集合并为一个结果输出。

示例：

Select sum(marks) total from table1 Where id > 1000 and id < 2000

Select sum(marks) total1 from table1 where id =>2000

Select sum(tables) totaltbl from table2 where id > 1000 and id < 2000

Select sum(tables) totaltbl1 from table2 where id => 2000

我需要以下格式的输出

Total total1 totaltbl totaltbl1
100.  2000.   10.      30

Answer 1

一个选项是在连接表期间应用条件聚合：

SELECT SUM(CASE WHEN t1.id >  1000 AND t1.id < 2000 THEN t1.marks END ) "Total",
       SUM(CASE WHEN t1.id >= 2000 THEN t1.marks END ) "Total1",
       SUM(CASE WHEN t2.id >  1000 AND t2.id < 2000 THEN t2.tables END ) "Totaltbl",
       SUM(CASE WHEN t2.id >= 2000 THEN t2.tables END ) "Totaltbl1"
  FROM table1 t1
 CROSS JOIN table2 t2

如何将两个以上的 select 查询合并到 oracle 中的单个结果集中

How to merge more than two select queries to single result set in oracle

sql

oracle

join

aggregation