Question

我收到一条消息，说该表达式是无效的标识符。我也得到消息说单组by无效。请建议替代。

我有以下Oracle SQL语句：

SELECT SUM(CASE
            WHEN PDRVARIANCE >= -1 then '1'
            WHEN PDRVARIANCE <-1 then '0'
          END) 
         / count(*) 
         * 100 as PercentCompliance ,
       TO_CHAR (ACTUALFINISHDATE,'MM/YY') AS DCSMONTH
  FROM    ACTIVITIES
WHERE DCSMONTH IS NOT NULL
GROUP BY DCSMONTH

现有数据将是这样的......

Variance     Month
   20       10/12
   3.2      10/12
   -4.2     10/12
   -27.8    10/12
   13       11/12
   3        11/12
   -1.2     12/12
   -2       12/12

期望的结果是对每个方差条件和逐月进行“真实”与“假”的百分比并将其显示为......

Percent   Month
    50    10/12
    100   11/12
    0     12/12

Answer 1

您不能在定义的相同范围内使用列别名。

您必须将GROUP BY DSCMONTH替换为GROUP BY TO_CHAR (ACTUALFINISHDATE,'MM/YY')（并对where子句执行相同操作），或者将查询包装在另一个查询中。

像，

select dcsmonth, sum(data) / count(*) * 100 percentcompliance 
  from (
SELECT CASE WHEN PDRVARIANCE >= -1 then 1
            WHEN PDRVARIANCE <-1 then 0 END data,
       TO_CHAR (ACTUALFINISHDATE,'MM/YY') AS DCSMONTH
  FROM  ACTIVITIES 
WHERE ACTUALFINISHDATE IS NOT NULL
)
GROUP BY DCSMONTH

按月分组的计数百分比的SQL查询

1 个答案: