Q) why do we use queries?

Ans:queries are user interactive, faster, compiles, reusable components

query, queryrun,querybuilddatasource,querybuildrange

if(qr.prompt())

Q) what is difference between temporary table and container???

Ans:when there  are more than 50 columns then we go for temp tables and also there are some advantages using temp tables - we can create index, methods, fieldgroups

Q) How  do u share tables across the companies????

Ans: Tablecollections and virtual companies

Q) when is configuration key used??

Ans:To enable and disable the features for all users [tables, fields, indexes, form controls, edt.enum...etc]

Security key for set of users or usergroups

- tables, forms, report, menuitems etc

RLS [Record level security]

Q) What are display methods?

Ans:Display methods will help you to show the data from some other table or hard-coded strings..these are not bound controls and we cannot use filter or sorting options