What type of join is needed when you wish to include rows that do not have matching values?
A. Equi-join
B. Natural join
C. Outer join
D. All of the above
Answer: Option C
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What type of join is needed when you wish to include rows that do not have matching values?
A. Equi-join
B. Natural join
C. Outer join
D. All of the above
What type of join is needed when you wish to return rows that do have matching values?
A. Equi-join
B. Natural join
C. Outer join
D. All of the above
Which of the following is true concerning a procedure?
A. You do not create them with SQL.
B. They do not need to have a unique name.
C. They include procedural and SQL statements.
D. They are the same thing as a function.
A CASE SQL statement is which of the following?
A. A way to establish an IF-THEN-ELSE in SQL.
B. A way to establish a loop in SQL.
C. A way to establish a data definition in SQL.
D. All of the above.
Why we need to create a index if primary key is already present in a table?
∆ all of the above
∆ index improves the speed of data retrieval operations on a database table
∆ indexes are synonyms of a column in a table
∆ indexes are special lookup tables that the database search engine can use