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why is this query invalid?

Why is this query invalid? When I write just SRV_ID instead of vt_exam_details.SRV_ID everything works just fine

 cl_id
, cl_name_last as CUSTOMER
, vt_animals.an_type
, vt_exam_details.SRV_ID
, vt_services.srv_desc
, vt_exam_details.ex_fee
from vt_clients
join vt_animals using (cl_id)
join vt_exam_headers using (an_id)
join vt_exam_details using (ex_id)
join vt_services using (srv_id)

Error:

Error at Command Line:5 Column:3
Error report:
SQL Error: ORA-00904: "VT_EXAM_DETAILS"."SRV_ID": invalid identifier
00904. 00000 - "%s: invalid identifier"
*Cause: 
*Action:

Thanks.

Answer*

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  • SQL> describe vt_exam_details EX_ID NOT NULL NUMBER(6) LINE_ITEM NOT NULL NUMBER(6) SRV_ID NOT NULL NUMBER(6) EX_FEE NOT NULL NUMBER(6,2) EX_DESC VARCHAR2(50) } – Commented Feb 17, 2013 at 7:00
  • 1
    I think the answer is that, since I have join vt_services using (srv_id) I don't have to specify the table name for attribute srv_id Commented Feb 17, 2013 at 7:20

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