Question: 4 . Given the schema item ( itemid , name, category, price, color ) transaction ( transid , custid, itemid, date ) customer ( custid

4. Given the schema
item(itemid, name, category, price, color)
transaction(transid, custid, itemid, date)
customer(custid, name, street-addr, city)
where primary keys are underlined, write the following queries in relational algebra:
1.

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