Mysql table view datatype

Question

I'm trying to change the data type bigint(37) to int(11) here. I've tried several methods CAST or CONVERT but ended unsuccessfully.

How can I change the datatype here in this table VIEW? please. thanks.

CREATE OR REPLACE VIEW gtemp_view AS
    SELECT
    d1.Week AS Week1,
    d2.Week AS Week2,
    IF( ABS(d1.dt1-d2.dt1)=0,1,0) +
    IF( ABS(d1.dt1-d2.dt2)=0,1,0) +
    IF( ABS(d1.dt1-d2.dt3)=0,1,0) +
    IF( ABS(d1.dt1-d2.dt4)=0,1,0) +
    IF( ABS(d1.dt2-d2.dt1)=0,1,0) +
    IF( ABS(d1.dt2-d2.dt2)=0,1,0) +
    IF( ABS(d1.dt2-d2.dt3)=0,1,0) +
    IF( ABS(d1.dt2-d2.dt4)=0,1,0) +
    IF( ABS(d1.dt3-d2.dt1)=0,1,0) +
    IF( ABS(d1.dt3-d2.dt2)=0,1,0) +
    IF( ABS(d1.dt3-d2.dt3)=0,1,0) +
    IF( ABS(d1.dt3-d2.dt4)=0,1,0) +
    IF( ABS(d1.dt4-d2.dt1)=0,1,0) +
    IF( ABS(d1.dt4-d2.dt2)=0,1,0) +
    IF( ABS(d1.dt4-d2.dt3)=0,1,0) +
    IF( ABS(d1.dt4-d2.dt4)=0,1,0) AS mcount
FROM gtemp AS d1 , gtemp AS d2 WHERE d1.Week IS NOT NULL AND d2.Week IS NOT NULL AND d1.Week > d2.Week order by Week1 DESC, Week2 DESC limit 200000;

Answer 1

If you don't want see INT37 in view schema you could try using an explict cast as unsigned

CREATE OR REPLACE VIEW gtemp_view AS
    SELECT
    d1.Week AS Week1,
    d2.Week AS Week2,
    cast( 
    (IF( ABS(d1.dt1-d2.dt1)=0,1,0) +
    IF( ABS(d1.dt1-d2.dt2)=0,1,0) +
    IF( ABS(d1.dt1-d2.dt3)=0,1,0) +
    IF( ABS(d1.dt1-d2.dt4)=0,1,0) +
    IF( ABS(d1.dt2-d2.dt1)=0,1,0) +
    IF( ABS(d1.dt2-d2.dt2)=0,1,0) +
    IF( ABS(d1.dt2-d2.dt3)=0,1,0) +
    IF( ABS(d1.dt2-d2.dt4)=0,1,0) +
    IF( ABS(d1.dt3-d2.dt1)=0,1,0) +
    IF( ABS(d1.dt3-d2.dt2)=0,1,0) +
    IF( ABS(d1.dt3-d2.dt3)=0,1,0) +
    IF( ABS(d1.dt3-d2.dt4)=0,1,0) +
    IF( ABS(d1.dt4-d2.dt1)=0,1,0) +
    IF( ABS(d1.dt4-d2.dt2)=0,1,0) +
    IF( ABS(d1.dt4-d2.dt3)=0,1,0) +
    IF( ABS(d1.dt4-d2.dt4)=0,1,0)) 
    AS UNIGNED) mcount
FROM gtemp AS d1 , gtemp AS d2 
WHERE d1.Week IS NOT NULL 
AND d2.Week IS NOT NULL 
AND d1.Week > d2.Week 
order by Week1 DESC, Week2 DESC limit 200000;

anyway the cast should impact on performance in several way ..instead the INT37 datatype don't should produce appretiable performance degrade