do we need to use alter table PAYMENT
add constraint CHK_PAYMENT_3 to
check the condition of credit use only when the total is over $5. ???
this means that we do not check cash or debit. and the cash and debit
will not be working after this constranins is inforcing.
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Credit can only be used when the total is over $5 but the other types of payment are always possible.
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