UNION set operator:
The UNION set operator is used to combine the output of two or more than two queries and produce a result. The produced result contains unique values.
Syntax: QUERY UNION QUERY;
INTERSECT set operator:
The INTERSECT set operator is used to combine the output of two or more than two queries and produce a result. The produced result contains the values (rows) that are common in both the tables.
Syntax: QUERY INTERSECT QUERY;
MINUS set operator:
The MINUS set operator is used to combine the output of two or more than two queries and produce a result. The produced result contains the values (rows) that appear in the first table but not in the second table. The word “EXCEPT” can also be used in the place of “MINUS”.
Syntax: QUERY MINUS QUERY;
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Chapter 8 Solutions
Database Systems: Design, Implementation, & Management
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- Which relational algebra operators can be applied to a pair of tables that are not union-compatible? Explain on an examplearrow_forwardNORMALIZATION EXERCISE Based on the given relation schema below, perform normalization up to 3NF. Write your answer in below space ORDER (Order_ID,Date,Cust_ID,Cust_Name,State,City,ItemNO,ItemDescription,ItemPrice,Quantity) 1NF 2NF 3NFarrow_forward
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