Question

我有两个查询，它从同一个表中选择一些数据

query1：

select rownum rn , error_data_log 
from ext_tab_log 
where error_data_log like'error%' 
ORDER BY rn, error_data_log ;

结果：

+----+--------------------------+
| RN |  error_data_log          |
+----+--------------------------+
| 1  |  error processing column |
+----+--------------------------+

查询2：

select rownum rn , error_data_log 
from ext_tab_log 
where error_data_log like 'KUP-04101%' 
ORDER BY rn, error_data_log ;

结果：

+----+----------------------------------------------+
| RN | error_data_log                               |
+----+----------------------------------------------+
| 1  | KUP-04101: record 1 rejected in file abc.txt |   
| 2  | KUP-04101: record 8 rejected in file abc.txt |  
| 3  | KUP-04101: record 9 rejected in file abc.txt |
+----+----------------------------------------------+

我们如何编写SQL查询以获得以下结果：

+----+----------------------------------------------+ 
| RN | error_data_log                               |
+----+----------------------------------------------+
| 1  | error processing column                      |
| 2  | KUP-04101: record 8 rejected in file abc.txt |
+----+----------------------------------------------+

Answer 1

如果我理解正确，你可以尝试这样的事情：

select rownum rn , error_data_log
from

    select rownum rn , error_data_log, 1 As QueryNum
    from ext_tab_log 
    where error_data_log like'error%' 

    UNION ALL

    select rownum rn , error_data_log, 2 QueryNum
    from ext_tab_log 
    where error_data_log like 'KUP-04101%' 
    group by rn , error_data_log, QueryNum
    having rn > 1 and rn < max(rn)

) UnionSelect   
ORDER BY QueryNum, rn, error_data_log ;

注意：直接写在这里的sql，我自己没试过。

Answer 2

WITH KUP-04101 AS
(SELECT error_data_log
 , CASE
     WHEN LEAD(error_data_log) OVER (ORDER BY error_data_log) IS NULL
      THEN 'Last'
     WHEN LAG(error_data_log) OVER (ORDER BY error_data_log) IS NULL 
      THEN 'First'
   END first_and_last
  FROM ext_tab_log 
  WHERE error_data_log LIKE 'KUP-04101%')
SELECT error_data_log 
FROM KUP-04101 
WHERE first_and_last NOT IN ('First','Last')
UNION
SELECT error_data_log 
FROM ext_tab_log 
WHERE  error_data_log LIKE 'error%' 
ORDER BY error_data_log ;

如何为以下条件编写SQL查询

2 个答案: