Mistake Ora-00904 methods you are endeavoring to execute a SQL articulation that is one of the accompanying:
- The SQL articulation incorporates an invalid segment name.
- The SQL articulation incorporates a segment name which does not presently exist.
- This mistake is most normal while questioning a SELECT assertion.
To determine this blunder, first check to ensure the section name being referred to exists. If it doesn’t exist, you should make one preceding endeavor to execute a SQL articulation with the section. If the section name exists, make sure to make sure that the segment name is in the appropriate grammar. To be substantial, the segment name should meet the accompanying measures:
- The section name can’t be a held word.
- The primary letter of the segment name should be a letter.
- The segment name should be not exactly or equivalent to 30 characters.
- The section name should be composed of alphanumeric characters.
The section name can contain any of the accompanying 3 characters: $, _, #. On the off chance that the section name incorporates some other characters, it should be encased with twofold quotes.
Coming up next is an illustration of a SQL proclamation containing Error Ora-00904:
- SELECT column_name AS “column_id”
- FROM table Request BY column_id;
In this model, the name “column_id” is associated with the column_name, which is subsequently questioned as column_id. Notice the missing twofold quotes in the second column_id. To determine the mistake, follow the appropriate language structure by encasing “column_id” in twofold quotes:
SELECT column_name AS “column_id”
FROM table Request BY “column_id”;
To try not to see blunder Ora-00904 invalid identifier later on, ensure the section name meets the rules for a substantial segment name. Revise the inquiry to follow this arrangement. In case you are endeavoring to inquire about a segment name which doesn’t exist, you should make the section. Continuously twofold actually takes a look at spelling.
