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CREATE TABLE prodtrans
(
pno number (4)
ptype char (1) CHECK (ptype in ('I','R','S')), qty number (5)
FOREIGN KEY pno REFERENCES product (pno) ON DELETE CASCADE);
In the table so formed please reminder the referential constraint on the foreign key pno in prodtrans table to product table. Any product record if removed from the product table will trigger deletion of all the related records (ON DELETE CASCADE) in the prodtrans table.
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#questiontypes of keys examples..
explaination
draw er diagram using entities crop,employee,department,plot,cultivation plan,machinery,seed,fertilizer
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