Sybase Adaptive Server Anywhere Reference page 766

Alphabetic list of error messages
Cannot uniquely identify column '%2' of table '%1' in the current
jdbc resultset
Probable cause
Cannot uniquely identify rows in cursor
Probable cause
748
Item Value
SQLCODE -756
Constant SQLE_JDBC_TBL_COL_NOT_FOUND_IN_RESULT
SET
SQLSTATE WJ021
Sybase error code 13766
ODBC 2 State ERROR
ODBC 3 State ERROR
Parameter 1 Table name
Parameter 2 Column name
Failed to identify a column in a JDBC resultset with the given table name
and column name. This can happen either the given names are not found or
they are ambiguous.
Item Value
SQLCODE -295
Constant SQLE_CANNOT_UNIQUELY_IDENTIFY_ROWS
SQLSTATE 09W05
Sybase error code 311
ODBC 2 State 42000
ODBC 3 State 42000
You opened a UNIQUE cursor on a SELECT statement for which a set of
columns uniquely identifying each row cannot be generated. One of the
tables may not be defined with a primary key or uniqueness constraint, or the
SELECT statement may involve a UNION or GROUP BY.