Tables, columns and other names Oracle cannot find, or that are already taken.
ORA-00942
table or view does not existThe table is missing, in another schema, not granted, or has a quoted name.
ORA-00904
invalid identifierA column or name that does not exist, is out of scope, or needs quotes.
ORA-00918
column ambiguously definedAn unqualified column that exists in more than one joined table.
ORA-00955
name is already used by an existing objectCREATE uses a name another object in the schema namespace already has.
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