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我正在尝试使用以下查询创建视图。

SELECT the_day, t1, t2
  FROM year_days
    LEFT JOIN (SELECT tea_prodcution_date, SUM(quantity) t1
                  FROM TEA_PRODUCTION
                  WHERE field_name like 'T1'
               GROUP BY tea_prodcution_date) ON the_day = tea_prodcution_date
     LEFT JOIN (SELECT tea_prodcution_date, SUM(quantity) t2
                  FROM TEA_PRODUCTION
                  WHERE field_name like 'T2'
               GROUP BY tea_prodcution_date) ON the_day = tea_prodcution_date
 ORDER BY the_day

year_days是使用以下查询创建的视图。

SELECT add_months(TRUNC(sysdate - (365), 'YYYY'),to_number(to_char(sysdate,'mm'))) + (level - 1) AS the_day
  FROM dual
CONNECT BY level <=
           to_number(TO_CHAR(last_day(add_months(TRUNC(sysdate, 'YYYY'), 11)),
                             'DDD'))

当我尝试执行第一个查询以创建视图时，出现以下错误。

ORA-00918: column ambiguously defined
00918. 00000 -  "column ambiguously defined"
*Cause:    
*Action:
Error at Line: 10 Column: 58

从ON the_day = tea_prodcution_date线路发生错误。

我怎样才能纠正这个错误并创建上面的视图？

4

1 回答 1

1

我的查询发现错误。查询应正确如下。

SELECT the_day, t1, t2
  FROM year_days
    LEFT JOIN (SELECT tea_prodcution_date, SUM(quantity) t1
                  FROM TEA_PRODUCTION
                  WHERE field_name like 'T1'
               GROUP BY tea_prodcution_date) aa ON the_day = aa.tea_prodcution_date
     LEFT JOIN (SELECT tea_prodcution_date, SUM(quantity) t2
                  FROM TEA_PRODUCTION
                  WHERE field_name like 'T2'
               GROUP BY tea_prodcution_date) bb ON the_day = bb.tea_prodcution_date
 ORDER BY the_day
于 2012-06-25T05:12:59.387 回答