w-BIG TABLE-view+where-small table

w-BIG TABLE

 DROP PROCEDURE IF EXISTS truncate_insert_sales_rank_toparow_month;
 DELIMITER /w/
 CREATE PROCEDURE truncate_insert_sales_rank_toparow_month ()
 BEGIN
 TRUNCATE sales_rank_toparow_month ;
 INSERT INTO sales_rank_toparow_month (
     fk_countrycode,
     fk_categoryid,
     history_year,
     history_month
 ) SELECT
     country,
     categoryid,
     grab_year,
     grab_month
 FROM
     grab_sales_rank_month
 GROUP BY
     country,
     categoryid,
     grab_year,
     grab_month ;
 END/w/
 DELIMITER;
 CALL truncate_insert_sales_rank_toparow_month;

 DROP PROCEDURE IF EXISTS insert_update_sales_rank_toparow_month;
 DELIMITER /w/
 CREATE PROCEDURE insert_update_sales_rank_toparow_month ()
 BEGIN
 SET @wtab = ' sales_rank_toparow_month  ';
 SET @wtab_src = 'grab_sales_rank_month';
 SET @w = 10;
 SET @wyear_max=(SELECT MAX(grab_year) FROM grab_sales_rank_month)+1;
 SET @wyear = (SELECT MIN(grab_year) FROM grab_sales_rank_month);

 WHILE @w < 101 DO
     WHILE @wyear < @wyear_max DO
         SET @wmonth=(SELECT MIN(grab_month) FROM grab_sales_rank_month WHERE grab_year=@wyear);
         SET @wmonth_max=(SELECT MAX(grab_month) FROM grab_sales_rank_month WHERE grab_year=@wyear)+1;
         WHILE @wmonth < @wmonth_max DO

                 DROP VIEW IF EXISTS    wview;
                 SET @wview_where = CONCAT(' WHERE grab_year=',@wyear,' AND grab_month=',@wmonth,' AND topx=',@w);
                 SET @wview =  CONCAT('CREATE VIEW wview AS SELECT * FROM ',@wtab_src,@wview_where,';');
                 PREPARE  stmt0 FROM @wview ;
                 EXECUTE  stmt0  ;
                 DROP PREPARE stmt0;

                 DROP VIEW IF EXISTS    wview1;
                 SET @wview1_where =  CONCAT(' WHERE history_year=',@wyear,' AND history_month=',@wmonth,';');
                 SET @wview1 =  CONCAT('CREATE VIEW wview1 AS SELECT * FROM ',@wtab,@wview1_where,';');
                 PREPARE  stmt2 FROM @wview1 ;
                 EXECUTE  stmt2  ;
                 DROP PREPARE stmt2;

                 SET @wfield = CONCAT('coin',@w);
                 SET @wnewvalue = CONCAT('(SELECT sum_coin FROM wview da  WHERE  wview1.fk_countrycode = da.country  AND wview1.fk_categoryid = da.categoryid AND wview1.history_year = da.grab_year AND wview1.history_month = da.grab_month  AND da.topx=',@w,'  )');
                 SET @wfieldb = CONCAT('amount',@w);
                 SET @wnewvalueb = CONCAT('(SELECT sum_amount FROM wview da  WHERE  wview1.fk_countrycode = da.country  AND wview1.fk_categoryid = da.categoryid AND wview1.history_year = da.grab_year AND wview1.history_month = da.grab_month  AND da.topx=',@w,'  )');

                 SET @wpre = CONCAT('UPDATE ',' wview1 ',' SET ',@wfield,'=',@wnewvalue,',',@wfieldb,'=',@wnewvalueb);
                 PREPARE  stmt1 FROM @wpre ;
                 EXECUTE  stmt1  ;
                 DROP PREPARE stmt1;

         SET @wmonth=@wmonth+1;
         END WHILE ;
     SET @wyear=@wyear+1;
     END WHILE ;
 SET @wyear = (SELECT MIN(grab_year) FROM grab_sales_rank_month);
 SET @w=@w+10;
 END WHILE ;
 END/w/
 DELIMITER ;
 CALL insert_update_sales_rank_toparow_month;

CREATE INDEX w1 ON grab_sales_rank_month (country);
CREATE INDEX w11 ON grab_sales_rank_month (categoryid);
CREATE INDEX w12 ON grab_sales_rank_month (grab_year);
CREATE INDEX w13 ON grab_sales_rank_month (topx);

USING BTREE  --->BETTER--->USING HASH