ms access - Convert string to date using sql and vba -

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i have query below in access , wanted use in vba...

sql = "update sales set sales.order_date = cdate(right([data],2)+" / "+mid([data],5,2)+" / "+left([data],4));"

i keep getting error due way building string execute.

i have tried put 

& "/" &

to build string error when executing sql...

how should build string?

thanks!!!

you use dateserial if data field of table:

sql = "update sales set sales.order_date = dateserial(left([data],4), mid([data],5,2), right([data],2))"

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