Excel Query case sensitive problem

HI all I am writing query in excel to join table. however I find it is case sensitive.  which cause many trouble.

how to make it case incensitive.

SELECT *
FROM `C:\compare.xlsx`.`sheet1$` a
left join `C:\compare.xlsx`.`sheet2$` b
on a.`name`=b.`name`
union
SELECT *
FROM `C:\compare.xlsx`.`sheet1
right join `C:\compare.xlsx`.`sheet2$` d
on c.`name`=d.`name`