In this post, you’ll learn about the error message -203 a reference to column column-name is ambiguous in the IBM DB2 database , the reason why it occurs along with the solution to fix it
IBM DB2 Error Message
-203 a reference to column column-name is ambiguous
Reason for the Error
Two or more of the tables specified in a FROM clause in the statement contain columns with the specified ‘column-name’.� The column name needs further qualification to establish which of the possible table-columns it is.
Solution
Qualify the ambiguous column name with a table name or correlation name.