There are times when we only want to the unique records from a table where there are many records that have the same value. In this example, I have a table that stores all the coating weight footage measurements for a strip of steel as it moves thru the zinc pot. The primary key of this table is composed of the four columns: Column Type WTAG NUMBER(7,0) MULT_NUM NUMBER(2,0) CUT_NUM NUMBER(3,0) FT_CWG NUMBER(6,0) so, as one can see, from the primary key definition, a single coil, as identified by ......