C Programming and Technical Programming Database

Data recovery is done in which layer?
a) physical
b) datalink
c) network
d) transport
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C Other Question

Data recovery is done in which layer? Type duplicates of a row in a table customer with non uniform key field customer number you
can see
a) delete from costomer where customer number exists( select distinct customer number from
customer having count )
b) delete customer a where customer number in b rowid
c) delete customer a where custermor number in( select customer number from customer a,
customer b
d) none of the above
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