DB2 SQL-Error: -203
Short Description: A REFERENCE TO COLUMN IS AMBIGUOUS
An unqualified column name is ambiguous if more than one table or view identified in the FROM clause has a column with that name, or if more than one column of a nested table expression has that name. A qualified column name is ambiguous only if the qualifier is the correlation name for a nested table expression and the column name is not unique. A reference to a column of the triggering table in a CREATE TRIGGER statement is ambiguous if it does not use the correlation name to indicate if it refers to the old or new transition variable. System action: The statement cannot be executed. Programmer response: If the problem is caused by a nonunique column name in a nested table expression, change the nested table expression so that the column name is unique. If the problem is caused by the use of an unqualified name, qualify it with a table, view, or correlation name.