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For example, a B-tree index on the type int4 would use the int4_ops class; this operator class includes comparison functions for values of type int4 . In practice the default operator class for the column's data type is usually sufficient. The main reason for having operator classes is that for some data types, there could be more than one meaningful index behavior. For example, we might want to sort a complex-number data type either by absolute value or by real part. We could do this by defining two operator classes for the data type and then selecting the proper class when making an index. The operator class determines the basic sort ordering (which can then be modified by adding sort options COLLATE , ASC / DESC and/or NULLS FIRST / NULLS LAST ).","There are also some built-in operator classes besides the default ones:"],"title":"Operator classes and families"}],"tables":[{"columns":[{"key":"operator","label":"Operator overload"},{"key":"strategy","label":"Strategy"},{"key":"purpose","label":"Purpose"},{"key":"sort_family","label":"Ordering family"},{"key":"scope","label":"Membership scope"},{"key":"description","label":"Source description"}],"key":"operators","rows":[{"description":"less than","operator":{"text":"\u003c(int8,int8)","url":"/wiki/operator/op-3c-int8-int8/?v=18"},"purpose":"search","scope":"Family member","sort_family":"","strategy":"1"},{"description":"less than or equal","operator":{"text":"\u003c=(int8,int8)","url":"/wiki/operator/op-3c3d-int8-int8/?v=18"},"purpose":"search","scope":"Family 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