On occasion, when joining two relations based on matching values in a join column, you will want rows to appear in the result relation even though no matching values occur in the second relation. Outer join operations make this possible. Several types of outer joins exist. In a left outer join, a binary operation, rows from the first relation that do not have matching values in the shared column of the second relation are included in the result relation. The algebraic notation for this operation is as follows.R X| S The X|symbol (not exact, representative) represents the left outer join operation. In the notation, "R" is the first relation and "S" is the second relation. Suppose a relation is needed containing the customers who have orders, the orderinformation, as well as customers who have no orders. The algebraic notation for this operation is as follows. πc_id,last_name,address,city,state,zip (Customer) Orders