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In this chapter, you will learn about the relational set operators _______, UNION ALL, INTERSECT, and MINUS
In this chapter, you will learn about the relational set operators _______, UNION ALL, INTERSECT, and MINUS
UNION
The _______ operator combines rows from two or more queries without including duplicate rows.
The _______ operator combines rows from two or more queries without including duplicate rows.
UNION
The SQL _______ operation is used to combine the result of two or more SQL SELECT queries.
The SQL _______ operation is used to combine the result of two or more SQL SELECT queries.
Union
The _______ operation eliminates the duplicate rows from its result set.
The _______ operation eliminates the duplicate rows from its result set.
The names of relation attributes must be the same and their data types must be _______ for relational set operators to work properly.
The names of relation attributes must be the same and their data types must be _______ for relational set operators to work properly.
The _______ clause is used to unite more than two queries.
The _______ clause is used to unite more than two queries.
The UNION ALL operator produces a relation that retains _______________ rows.
The UNION ALL operator produces a relation that retains _______________ rows.
The INTERSECT operator combines rows from two queries, returning only the rows that appear in both _______________.
The INTERSECT operator combines rows from two queries, returning only the rows that appear in both _______________.
The MINUS operator combines rows from two queries, returning only the rows that appear in the first _______________ but not in the second.
The MINUS operator combines rows from two queries, returning only the rows that appear in the first _______________ but not in the second.
The join operation merges rows from two tables and returns the rows with one of the following: Have common values in common columns, this is called _______________ join.
The join operation merges rows from two tables and returns the rows with one of the following: Have common values in common columns, this is called _______________ join.
The cross join performs the relational product of two tables, also called __________________ product.
The cross join performs the relational product of two tables, also called __________________ product.
The IN and NOT IN subqueries can be used in place of the __________________ operator.
The IN and NOT IN subqueries can be used in place of the __________________ operator.
The SQL Join Operators include __________________ join, which only returns rows meeting the specified criteria.
The SQL Join Operators include __________________ join, which only returns rows meeting the specified criteria.
The natural join operation is a type of __________________ operation that combines rows of two or more tables based on a common column between them.
The natural join operation is a type of __________________ operation that combines rows of two or more tables based on a common column between them.
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Study Notes
Relational Set Operators
- Relational set operators require relations to be union-compatible, meaning named attributes must be the same and have identical data types.
- There are four types of relational set operators: UNION, UNION ALL, INTERSECT, and MINUS.
UNION
- Combines rows from two or more queries without including duplicate rows.
- Can be used to unite more than two queries.
- Eliminates duplicate rows from the result set.
UNION ALL
- Produces a relation that retains duplicate rows.
- Can be used to unite more than two queries.
INTERSECT
- Combines rows from two queries, returning only the rows that appear in both sets.
- Syntax: query INTERSECT query.
- Can be replaced with IN and NOT IN subqueries.
MINUS
- Combines rows from two queries, returning only the rows that appear in the first set but not in the second.
- Syntax: query MINUS query.
SQL Join Operators
- Join operation merges rows from two tables and returns rows based on common values or conditions.
- Types of joins: Natural join, Inner join, Outer join, and Cross join.
Cross Join
- Performs the relational product of two tables, also known as the Cartesian product.
- Syntax: SELECT column-list FROM table1 CROSS JOIN table2.
MySQL Natural Join
- Combines rows of two or more tables based on a common column between them.
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