vivek.d
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create table invoices( year int not null ,invoice_number int not null auto_increment ,primary key(year, invoice_number) ); insert into invoices(year) values(2009); insert into invoices(year) values(2009); insert into invoices(year) values(2009); insert into invoices(year) values(2010); insert into invoices(year) values(2010); insert into invoices(year) values(2010); select * from invoices; +------+----------------+ | year | invoice_number | … 
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