Coupons: unique code and discount range
Design a coupons table: the code is required and unique, and the discount pct is an integer from 1 to 100. Columns: id — primary key; code; pct.
Ainult CREATE/ALTER/DROP — lõpus pole vaja SELECT-i.
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See ülesanne algab ilma tabeliteta — loo need käsuga CREATE TABLE.