what is the diffrence between SCD and INCREMENTAL Aggregation?

 HIRE DIMENSIONAL DATA IS STORED. NO AGGRIGATE CALCULATIONS
            SCD WE R USING 3 WAYS
            1.TYPE-1: IT'S MAINTAIN CURRENT DATA ONY
            2.TYPE-2: IT'S MAINTAIN CURRENT DATA + COMPLET HOSTROY RECORDS
            THESE R 3 WAYS :1.FLAG DATA
            2.VERSION NO MAPPING
            3.EFFECTIVE DATE RANGE
            3.TYPE-3: IT'S MAINTAIN CURRENT DATA +ONE TIME HISTROY
            INCREMENTAL AGGRATION ARE STORED AGGRAGATE VALUES ACCORDING TO THE  USER REQUIREMENTS

scd means 'slowly changing dimentions'since dimention table
            maintains master data the column values occationally changed .so
            dimention tables are called as scd tables and the fields in the scd
            tables are called as slowly changing dimentions .in order to
            maintain those changes we are following three types of methods.1.
            SCD TYPE1 this method maintains only current data2. SCD TYPE2 this
            method maintains whole history of the dimentions here three methods
            to identify which record is current one . 1> flag current data 2>
            version number mapping 3> effective date range3. SCD TYPE3 this
            method maintains current data and one time historical
            data.INCREMENTAL AGGRIGATIONsome requirements (daily weekly every 15
            days quartly..........) need to aggrigate the values of certain
            colums. HERE U have to do the same job every time (according to
            requirement) and add the aggrigate value to the previous aggrigate
            value(previous run value) of those column.THE PROCESS CALLED AS
            INCREMENTAL AGGRIGATION.