临时表左连接子句中的标识符无效答案

【问题标题】：Invalid Identifier in Temp Table Left Join Clause临时表左连接子句中的标识符无效
【发布时间】：2017-10-05 23:20:07
【问题描述】：

美国东部标准时间晚上好，

我被困在下面的查询中，我在第 12 行，第一个“DELETE FLAG”处不断收到一个无效的标识符错误。不确定我是否遗漏了一些语法或做其他愚蠢的事情。（我已经非常彻底地检查了我没有拼错任何内容并且所有字段都存在）

Oracle SQL Developer V. 17.2 任何帮助将不胜感激。

SELECT
      CM.SUBJECT_PERSON_ID,
      CM.COHORT_SCOPED_IDENTIFIER AS SUBJECT_STUDY_ID,
      SA3.ALT_ID_VALUE AS GLOBAL_SUBJECT_ID,
      V.PREFERRED_TERM AS MEMBER_STATUS,
      CM.COHORT_ID,
      SA2.ALT_ID_VALUE AS CRIN_ID
 FROM GLENAPO.COHORT_MEMBER CM
                LEFT JOIN GLENAPO.SUBJECT_ALT_ID SA1
         ON     SA2.SUBJECT_PERSON_ID =CM.SUBJECT_PERSON_ID
            AND SA2.IDENTIFIER_TYPE_ID = 8 -- get SDG_ID
            AND SA2.DELETE_FLAG = 'N'
           LEFT JOIN GLENAPO.SUBJECT_ALT_ID SA1
         ON     SA2.SUBJECT_PERSON_ID =CM.SUBJECT_PERSON_ID
            AND SA2.IDENTIFIER_TYPE_ID = 8 -- get SDG_ID
            AND SA2.DELETE_FLAG = 'N'
      LEFT JOIN GLENAPO.SUBJECT_ALT_ID SA2
         ON     SA2.SUBJECT_PERSON_ID =CM.SUBJECT_PERSON_ID
            AND SA2.IDENTIFIER_TYPE_ID = 18 -- get CRIN ID
            AND SA2.DELETE_FLAG = 'N'
      JOIN GLENAPO.SUBJECT_ALT_ID SA3
         ON     SA3.SUBJECT_PERSON_ID =CM.SUBJECT_PERSON_ID
            AND SA3.IDENTIFIER_TYPE_ID = 12 -- get Global Subject
            AND SA3.DELETE_FLAG = 'N'
      LEFT JOIN GLENAPO.VOCAB_TERM_VIEW V
         ON     V.TABLE_NAME = 'COHORT_MEMBER'
            AND V.COLUMN_NAME = 'STATUS_CODE'
            AND V.CONCEPT_ID = CM.STATUS_CODE
      LEFT JOIN GLENAPO.FACILITY_REFERENCE FR ON FR.FACILITY_ID = CM.FACILITY_ID      
WHERE CM.DELETE_FLAG = 'N'

【问题讨论】：

标签： sql oracle left-join temp-tables

【解决方案1】：

这是FROM 子句的开头：

 FROM GLENAPO.COHORT_MEMBER CM LEFT JOIN
      GLENAPO.SUBJECT_ALT_ID SA1
      ON SA2.SUBJECT_PERSON_ID = CM.SUBJECT_PERSON_ID AND
         SA2.IDENTIFIER_TYPE_ID = 8 AND -- get SDG_ID
         SA2.DELETE_FLAG = 'N'

表别名在使用前需要定义。我想你打算SA1，而不是SA2：

 FROM GLENAPO.COHORT_MEMBER CM LEFT JOIN
      GLENAPO.SUBJECT_ALT_ID SA1
      ON SA1.SUBJECT_PERSON_ID = CM.SUBJECT_PERSON_ID AND
         SA1.IDENTIFIER_TYPE_ID = 8 AND -- get SDG_ID
         SA1.DELETE_FLAG = 'N'

【讨论】：