Question

我无法在Toad中运行以下查询。

我收到错误ORA-32033: unsupported column alias。

WITH
  sample_data( month, day ) AS (
    SELECT TO_CHAR(TO_DATE(X,'DD-MM-YY'),'MON') AS month,
           TO_CHAR(TO_DATE(X,'DD-MM-YY'),'DD') AS day
      FROM (SELECT CASE WHEN TO_CHAR(TO_DATE('01-05-2015','DD-MM-YY')+(ROWNUM-1),'DY') = 'FRI'
                        THEN TO_CHAR(TO_DATE('01-05-2015','DD-MM-YY')+(ROWNUM-1),'DD-MM-YY')
                        ELSE NULL END AS X
              FROM all_objects
             WHERE ROWNUM < (select (to_date ('01-05-16','dd-MM-yyyy')
                                     - to_date('01-05-15','dd-MM-yyyy') + 1)
                               from dual)
           )
     WHERE X IS NOT NULL;
  ),
  ordered_dates( month, day, seq_no ) AS (
    SELECT month,
           day,
           ROW_NUMBER() OVER ( PARTITION BY month ORDER BY day )
      FROM sample_data
  )
SELECT MAX( CASE WHEN month = 'Jan' AND seq_no = 1 THEN day END ) AS "Jan",
       MAX( CASE WHEN month = 'Jan' AND seq_no = 2 THEN day END ) AS "Jan",
       MAX( CASE WHEN month = 'Jan' AND seq_no = 3 THEN day END ) AS "Jan",
       MAX( CASE WHEN month = 'Feb' AND seq_no = 1 THEN day END ) AS "Feb",
       MAX( CASE WHEN month = 'Feb' AND seq_no = 2 THEN day END ) AS "Feb",
       MAX( CASE WHEN month = 'Feb' AND seq_no = 3 THEN day END ) AS "Feb"
  FROM ordered_dates;

我做错了什么？

Answer 1

基于your previous question title，这个问题似乎是一个扩展，你使用的是Oracle 10g。列别名不是Oracle 10g中WITH子句语法的一部分。 syntax diagram from 10gR2：

syntax diagram from 11gR2：

别名是递归子查询因子分解所必需的 - 也在11gR2中添加 - 否则是可选的。

对于10g，您需要将列作为子查询的一部分进行别名，除了seq_no之外，您已经做了一些冗余，但是您还需要从WITH ... AS部分删除别名：< / p>

WITH sample_data AS (
  SELECT TO_CHAR(TO_DATE(X,'DD-MM-YY'),'MON') AS month,
         TO_CHAR(TO_DATE(X,'DD-MM-YY'),'DD') AS day 
  FROM
...
),
ordered_dates AS (
  SELECT month,
         day,
         ROW_NUMBER() OVER ( PARTITION BY month ORDER BY day ) AS seq_no
  FROM   sample_data
)
...

查询抛出“ORA-32033：不支持的列别名”

1 个答案: