Tables are joined on columns that have the same _________ and data width in the tables.
A. Data
B. Value
C. Data Type
D. Information
A
B
C
D
Question 2
The __________ returns all rows from both tables where there is a match.
A. Inner Join
B. Left outer join
C. Right Outer join
D. Full Outer Join
A
B
C
D
Question 3
Inner joins are also known as ______________.
A. Equi join
B. Semi join
C. Outer join
D. None
A
B
C
D
Question 4
A _________ key is a column with a unique value for each row.
A. Key
B. Field
C. Candidate
D. Primary
A
B
C
D
Question 5
Tables in a database can be related to each other with the help of __________.
A. Attributes
B. Tuples
C. Keys
D. Fields
A
B
C
D
Answers
Answer:
a d c a b
Explanation:
Answer:
The answer to the given question is:
1. A. Data
2. D. Full Outer Join
3. C. Outer Join
4. A. Key
5. A. Key
Explanation:
In computing, data is information transformed into a form that is easy to move or process. Compared to modern computers and transmission media, data is information converted into binary digital form. Data may be used in singular or plural subjects.
In SQL, FULL OUTER JOIN combines the results of left and right outer joins and returns all (matching or non-matching) rows from tables on both sides of the join clause.
An outer join is a join that returns matching and non-matching values in one or both tables. There are several types of outer joins. A LEFT JOIN returns only non-matching rows from the left table and matching rows from both tables.
An SQL key is a single column (or attribute) or group of columns that can uniquely identify a row (or tuple) in a table. The SQL key ensures that there are no rows with duplicate information. It also helps to establish relationships between different tables in a database.
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