How Oracle Add NOT NULL Constraintby Ed ChenNovember 23, 2019September 24, 2021Add NOT NULL Constraint As I mentioned in resolving ORA-00904 for adding a constraint, NOT NULL is a constraint, but it's more like an attribute… Read More »How Oracle Add NOT NULL Constraint
How Oracle Remove NOT NULL Constraintby Ed ChenNovember 23, 2019September 24, 2021Before we talk about how to remove NOT NULL constraint, I assume that you have already know how to add a NOT NULL constraint to… Read More »How Oracle Remove NOT NULL Constraint
How to Resolve ORA-00904 Invalid Identifierby Ed ChenMarch 12, 2019March 7, 20224 CommentsORA-00904 ORA-00904 means that you used an invalid identifier which is mostly an unmatched column name or used an incorrect or unqualified syntax in your… Read More »How to Resolve ORA-00904 Invalid Identifier