Web Reference: May 17, 2011 · Check very closely the tabulation/indent of your code - (depending of your settings), SQL Developer handles the indentation of your code different. The code you're working on might not be tabulated/indented - making the debugging of these kind of errors harder and time-consuming. Enter a valid identifier or column name and verify that there are no typos in the identifier or column name. A valid identifier must begin with a letter, be less than or equal to 128 characters, and consist of only alphanumeric characters and the special characters $, _, and #. Fix ORA-00904 invalid identifier in Oracle. Common causes: typos, missing quotes, wrong alias. Step-by-step solutions with SQL examples.
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