Nested query microsoft access -

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i have table of transactions. table multiple vendors multiple transactions multiple transaction amounts. need update table if vendors transaction more double transaction amount average vendor. far came following code wrong:

update tbltransaction set variabilityindicator = 1 transactionnumber in (select transactionnumber tbltransaction group vendorname having transactionamount >= avg(transactionamount*2))

the code above wrong. came statement possibly nested:

select avg(transactionamount) vendorname tbltransaction group vendorname

this should return vendornames average transaction amounts. how can nest can compare transactionamount average vendor names match??

update tbltransaction set variabilityindicator = 1 transactionnumber in (     select t.transactionnumber     tbltransaction t     t.transactonamount > 2 * (       select avg(transactionamount)       tbltransaction       a.vendorname = t.vendorname     ) )

you may want check business logic exclude transactionamount being evaluated average calculation. may not want match on vendor name, on sort of id number/primary key value.


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