create table cust (CustomerName char(4),
CustomerRefNumber int,
InvoiceNumber varchar(10),
InvoiceAmount int)
insert into cust values ('AAA', 111, 'Inv001', 1000)
insert into cust values('AAA', 111, 'Inv002', 1100)
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insert into cust values('BBB', 222, 'Inv003', 3000)
insert into cust values...