Question

我有以下两个表

username            data_usage          cost
  -----               ------            ----
user1             50         159
user2             250        376
user3             150        225


  username      user1       user2       user3 
   -----        -----       -----       -----
data_usage           50     200      150
cost        159     376      225

我想检查两个表的值是否相等，但问题是这样第一个表的用户名是列名，第二个表的值是

那么无论如何使用PL / SQL在oracle中对这些表进行旋转？或其他任何方式吗？

输出将是这样的

user1 has different values column name data usage 250 at first table and 200 at table2

Answer 1

如果数据库版本为＆gt; = Oracle 11.2

，则使用pivot和unpivot

WITH table1(username,data_usage,cost) AS (
SELECT 'user1', 50, 159 FROM dual UNION ALL
SELECT 'user2', 250, 376 FROM dual UNION ALL
SELECT 'user3', 150, 225 FROM dual),
table2(username,user1,user2,user3) AS (
SELECT 'data_usage', 50, 200, 150 FROM dual UNION ALL
SELECT 'cost', 159, 376, 225 FROM dual)
---
--End of data preparation
---
select tb.username || ' has different values column name data usage '|| tb.data_usage ||' at first table and '|| ta.data_usage ||' at table2' as text
from (select *
        from table2
     unpivot (val for users in (user1 as 'user1', user2 as 'user2', user3 as 'user3'))
       pivot (min(val) for username in ('data_usage' as data_usage, 'cost' as cost))) ta
join table1 tb on (username = users)
WHERE ta.data_usage <> tb.data_usage;

输出继电器：

|                                                                                   TEXT |
|----------------------------------------------------------------------------------------|
| user2 has different values column name data usage 250 at first table and 200 at table2 |

只需使用此查询

select tb.username || ' has different values column name data usage '|| tb.data_usage ||' at first table and '|| ta.data_usage ||' at table2' as text
from (select *
        from table2
     unpivot (val for users in (user1 as 'user1', user2 as 'user2', user3 as 'user3'))
       pivot (min(val) for username in ('data_usage' as data_usage, 'cost' as cost))) ta
join table1 tb on (username = users)
WHERE ta.data_usage <> tb.data_usage;

将table1和table2替换为您的表名

如何旋转两个表中的一个？

1 个答案: