ORA-01754: a table may contain only one column of type LONG
Answer / guest
Cause: An attempt was made to add a LONG column to a table
which already had a LONG column. Note that even if the LONG
column currently in the table has already been marked
unused, another LONG column may not be added until the
unused columns are dropped.
Action: Remove the LONG column currently in the table by
using the ALTER TABLE command.
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