单项选择题

A subquery can be used to （）.

A. Create groups of data
B. Sort data in a specific order
C. Convert data to a different format
D. Retrieve data based on an unknown condition

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单项选择题

Which clause should you use to exclude group results? （）

A. WHERE
B. HAVING
C. RESTRICT
D. GROUP BY
E. ORDER BY

单项选择题

What is true about joining tables through an equijoin? （）

A. You can join a maximum of two tables through an equijoin.
B. You can join a maximum of two columns through an equijoin.
C. You specify an equijoin condition in the SELECT or FROM clauses of a SELECT statement.
D. To join two tables through an equijoin, the columns in the join condition must be primary key and foreign key columns.
E. You can join n tables (all having single column primary keys) in a SQL statement by specifying a minimum of n-1 join conditions.

单项选择题

You need to calculate the total of all salaries in the accounting department. Which group function should you use? （）

A. MAX
B. MIN
C. SUM
D. COUNT
E. TOTAL
F. LARGEST