ORA-00918
column_name: column ambiguously specified - appears in table_name_1 and table_name_2
- column_name: The name of the column that is specified ambiguously.
- table_name_1: The first table being joined that contains a reference to the ambiguously defined column name.
- table_name_2: The second table being joined that contains a reference to the ambiguously defined column name.
Cause
A column name used in a join was defined in more than one table and was referenced ambiguously. In a join, any column name that occurs in more than one of the tables must be prefixed by its table name or table alias when referenced.
Action
To avoid ambiguity, prefix references to column names that exist in multiple tables with either the table name or a table alias and a period. For example, if tables EMP and DEPT are being joined and both contain the column DEPTNO, then all references to DEPTNO should be prefixed with the table name, as in EMP.DEPTNO or DEPT.DEPTNO.
ORA-00918
column ambiguously defined
Cause
A column name used in a join exists in more than one table and was thus referenced ambiguously. In a join, any column name that occurs in more than one of the tables must be prefixed by its table name when referenced. The column should be referenced as TABLE.COLUMN or TABLE_ALIAS.COLUMN. For example, if tables EMP and DEPT are being joined and both contain the column DEPTNO, then all references to DEPTNO should be prefixed with the table name, as in EMP.DEPTNO or E.DEPTNO.
Action
Prefix references to column names that exist in multiple tables with either the table name or a table alias and a period (.), as in the examples above.
ORA-00918
column ambiguously defined
Cause
A column name used in a join exists in more than one table and was thus referenced ambiguously. In a join, any column name that occurs in more than one of the tables must be prefixed by its table name when referenced. The column should be referenced as TABLE.COLUMN or TABLE_ALIAS.COLUMN. For example, if tables EMP and DEPT are being joined and both contain the column DEPTNO, then all references to DEPTNO should be prefixed with the table name, as in EMP.DEPTNO or E.DEPTNO.
Action
Prefix references to column names that exist in multiple tables with either the table name or a table alias and a period (.), as in the examples above.
