Question

Can anyone explain to me why I get a 00904 error when I run the following

SELECT "OASM"."DT_GROUPEPG".GROUPEPGID,
  "OASM"."DT_GROUPEPG".GROUPID,
  "OASM"."DT_GROUPEPG".EPGID,
  "OASM"."DT_GROUPEPG".ZAPID,
  "OASM"."LU_EPG".LASTREADTIME,
  "OASM"."LU_EPG".SERVICE_NAME,
  "OASM"."LU_EPG".SOURCE_ID,
  "OASM"."LU_EPG".ONID,
  "OASM"."LU_EPG".TSID,
  "OASM"."LU_EPG".SID,
  "OASM"."LU_EPG".TYPE_ID,
  "OASM"."LU_EPG".OPERATOR_ID,
  "OASM"."LU_EPG".URL 
FROM "OASM"."DT_GROUPEPG"
INNER JOIN "OASM"."LU_EPG"
ON "OASM"."DT_GROUPEPG".EPGID = "OASM"."LU_EPG".EPGID
ORDER BY LastReadTime;

I’m still new to Oracle, and was of the impression that, because Oracle executes blocks of statements, and not line by line, that doing this kind of query would be valid? The error currently fires at the OPERATOR_ID line, but removing/commenting it out just moves the erro up a line, until all the LU_EPG table references are removed

Answer 1

You can’t (and don’t need to) specify the schema name when referring to the columns. Also, I recommend you use table aliases (e.g. a and b in the example below):

SELECT a.GROUPEPGID,
  a.GROUPID,
  a.EPGID,
  a.ZAPID,
  b.LASTREADTIME,
  b.SERVICE_NAME,
  b.SOURCE_ID,
  b.ONID,
  b.TSID,
  b.SID,
  b.TYPE_ID,
  b.OPERATOR_ID,
  b.URL 
FROM "OASM"."DT_GROUPEPG" a
INNER JOIN "OASM"."LU_EPG" b
ON a.EPGID = b.EPGID
ORDER BY b.LastReadTime;