The following code would include:

SELECT Customer$\_$T$.$CustomerID, Order$\_$T$.$CustomerID,

CustomerName, OrderID

FROM Customer$\_$T$,$ Order$\_$T

WHEREF Customer$\_$T$.$CustomerID $=$ Order$\_$T$.$ CustomerID;

all rows of the Customer$\_$T Table regardless of matches with the Order$\_$T Table.

all rows of the Order$\_$T Table regardless of matches with the Customer$\_$T Table.

only rows that match both Customer$\_$T and Order$\_$T Tables.

only rows that don't match both Customer$\_$T and Order$\_$T T Tables.