Sql 连接表达式不明确

我的ddl脚本如下所示：

CREATE TABLE  CPR_ENTITIES
(   
     ENTITY_ID NUMBER(20) NOT NULL,
     SYSTEM_ID NUMBER(4),
     ENTITY_TYPE_ID NUMBER(8),
     GLOBAL_UID  VARCHAR2(1000),
     SYS_OBJ_UID VARCHAR2(1000),
     ENTITY_NAME VARCHAR2(1000),
     CAGE_CODE VARCHAR2(2000),
     REVISION VARCHAR2(2000),
     ENTITY_CREATION_DATE NUMBER(20),
     ENTITY_MODIFICATION_DATE NUMBER(20),
     RELEASE_DATE NUMBER(20),
     .......................,
     ........................
      CONSTRAINT "CPR_ENTITIES_PK" PRIMARY KEY ("ENTITY_ID"),
     CONSTRAINT "CPR_ENTITIES_FK1" FOREIGN KEY ("SYSTEM_ID") REFERENCES CPR_SOURCE_SYSTEM_METADATA("SYSTEM_ID"),
     CONSTRAINT "CPR_ENTITIES_FK2" FOREIGN KEY ("ENTITY_TYPE_ID") REFERENCES CPR_ENTITY_METADATA("ENTITY_TYPE_ID"));



CREATE TABLE CPR_ENTITY_ATTRIBUTE 
(   
     VAL_ID  NUMBER(20) NOT NULL,
     ENTITY_ID NUMBER(20),
     ATT_ID NUMBER(10),
     STRING_VALUE VARCHAR2(4000),
     NUM_VALUE NUMBER(10,2),
     TIMESTAMP_VALUE TIMESTAMP,
     CREATED_BY VARCHAR2(200),
     MODIFIED_BY VARCHAR2(200),
     CREATED_ON NUMBER(20),
     MODIFIED_ON NUMBER(20),
     IS_DELETED VARCHAR2(1),    
     CONSTRAINT "CPR_ENTITY_ATTRIBUTE_PK" PRIMARY KEY ("VAL_ID"),
     CONSTRAINT "CPR_ENTITY_ATTRIBUTE_FK1" FOREIGN KEY ("ENTITY_ID") REFERENCES CPR_ENTITIES("ENTITY_ID"),
     CONSTRAINT "CPR_ENTITY_ATTRIBUTE_FK2" FOREIGN KEY ("ATT_ID") REFERENCES CPR_ENTITY_ATTRIBUTE_METADATA("ATT_ID")
 );

联接表达式：

 SELECT CPR_ENTITIES.ENTITY_ID, CPR_ENTITY_ATTRIBUTE.STRING_VALUE
 FROM CPR_ENTITIES
     LEFT JOIN CPR_ENTITIES
         ON CPR_ENTITIES.ENTITY_ID = CPR_ENTITY_ATTRIBUTE.ENTITY_ID;

错误提示：

第1行错误：ORA-00904：“CPR\u实体\u属性”。“实体\u ID”： 无效标识符

也许是这样

SELECT CPR_ENTITIES.ENTITY_ID, CPR_ENTITY_ATTRIBUTE.STRING_VALUE
FROM CPR_ENTITIES
LEFT JOIN CPR_ENTITY_ATTRIBUTE
     ON CPR_ENTITIES.ENTITY_ID = CPR_ENTITY_ATTRIBUTE.ENTITY_ID;

试一试

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您尝试从表CPR\u ENTITY\u属性中选择一列，但该表未包含在查询中…您没有

CPR\u ENTITY\u属性
位于
from
或
JOIN
选择CPR\u ENTITIES。ENTITY\u ID，CPR\u ENTITY\u属性。CPR\u ENTITIES中的字符串\u值，CPR_实体_属性左键连接CPR_实体上的CPR_实体。实体_ID=CPR_实体_属性。实体_ID；在查询中，您将CPR_ENTITIES表与同一个表联接。您需要这样使用：从CPR\u ENTITIES中选择CPR\u ENTITIES.ENTITY\u ID、CPR\u ENTITY\u ATTRIBUTE.STRING\u值在CPR\u ENTITIES.ENTITY\u ID=CPR\u ENTITY\u ATTRIBUTE.ENTITY\u ID上左连接CPR\u ENTITY\u属性；是的，上面的左连接为我提供了实体ID，但不是STRING_VALUE列中的值，是否应该修改查询？是的，上面的左连接为我提供了实体ID，而不是CPR_实体的字符串_值列中的值_ATTRIBUTE@SteffiDas在
CPR\u ENTITY\u属性
中是否有这样的
ENTITY\u ID
行？是，CPR_entity_属性中的实体_id是其外键和CPR的主键_ENTITIES@SteffiDas
CPR\u ENTITY\u ATTRIBUTE.ENTITY\u ID
是外键这一事实并不意味着该行存在于
CPR\u ENTITY\u ATTRIBUTE
中。是的，我知道，但CPR\u ENTITY\u属性中有针对该ENTITY\u ID的数据
SELECT CPR_ENTITIES.ENTITY_ID, CPR_ENTITY_ATTRIBUTE.STRING_VALUE
FROM CPR_ENTITIES
     LEFT JOIN CPR_ENTITY_ATTRIBUTE
         ON CPR_ENTITIES.ENTITY_ID = CPR_ENTITY_ATTRIBUTE.ENTITY_ID;