I work in a Walmart (Asda) while doing my Uni course, I came accross the job because I have a relative who worked there who informed me that there was a job there however I can tell you that if you fill in a Application form for them they do keep it on hand for 6 month's incase of any openings after that you will need to fill in anouther one if you look there.
As for interview advice well what you wear and how you act will have more of an impact than what you say I believe, wearing a shirt for example will give you a better chance than say a hooded jumper and sitting strait makes you look more interested and willing so little things to keep in mind (also remember to smile and take an active role in any 'team based' activities they come up with).
But yeah I believe most supermarkets do the same, go in ask for a App form and they will keep hold of it for a set amount of time and look at it when they have any openings.
May seem long and boring but hopefully something in all that can help you. ^^
As for interview advice well what you wear and how you act will have more of an impact than what you say I believe, wearing a shirt for example will give you a better chance than say a hooded jumper and sitting strait makes you look more interested and willing so little things to keep in mind (also remember to smile and take an active role in any 'team based' activities they come up with).
But yeah I believe most supermarkets do the same, go in ask for a App form and they will keep hold of it for a set amount of time and look at it when they have any openings.
May seem long and boring but hopefully something in all that can help you. ^^