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What type of join eliminates one of the duplicate columns in the result table?
What type of join eliminates one of the duplicate columns in the result table?
- Equi-join
- Outer join
- Union join
- Natural join (correct)
Which type of join includes all columns from each table and an instance for each row of each table?
Which type of join includes all columns from each table and an instance for each row of each table?
- Outer join
- Union join (correct)
- Equi-join
- Natural join
In which type of join are rows included in the result table only if they have matching values in common columns?
In which type of join are rows included in the result table only if they have matching values in common columns?
- Union join
- Natural join
- Outer join
- Equi-join (correct)
What is the relational operation that causes two or more tables with a common domain to be combined into a single table or view?
What is the relational operation that causes two or more tables with a common domain to be combined into a single table or view?
In which type of join are rows that do not have matching values in common columns included in the result table?
In which type of join are rows that do not have matching values in common columns included in the result table?
What does the ON clause perform in a join?
What does the ON clause perform in a join?
In a 1:M relationship, what are the common columns in joined tables usually?
In a 1:M relationship, what are the common columns in joined tables usually?
What does a union join include from each table?
What does a union join include from each table?
What type of join causes two or more tables with a common domain to be combined into a single table or view?
What type of join causes two or more tables with a common domain to be combined into a single table or view?
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Study Notes
Join Types
- Natural Join: eliminates one of the duplicate columns in the result table.
Cartesian Product (Cross Join)
- includes all columns from each table and an instance for each row of each table.
Inner Join
- includes rows in the result table only if they have matching values in common columns.
Union Operation
- combines two or more tables with a common domain into a single table or view.
Outer Join (Left, Right, Full)
- includes rows that do not have matching values in common columns in the result table.
ON Clause
- specifies the condition for which rows are included in the result table.
1:M Relationship
- common columns in joined tables are usually the foreign key in the 'many' table and the primary key in the 'one' table.
Union Join
- includes all rows from both tables, with duplicate rows removed.
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