| Column | MySQL Type | Oracle Type | Nullable | Description | 
|---|---|---|---|---|
| Pathway1WID | BIGINT | NUMBER | No | WID of one of the linked pathways | 
         
| Pathway2WID | BIGINT | NUMBER | No | WID of the other linked pathways | 
         
| ChemicalWID | BIGINT | NUMBER | No | WID of the linking chemical | 
         
| Name | Columns | 
|---|---|
| PATHLINK_P1WID_P2WID_CHEMWID | PATHWAY1WID, PATHWAY2WID, CHEMICALWID | 
| PATHLINK_P2WID | PATHWAY2WID | 
| PATHLINK_CHEMWID | CHEMICALWID |