The BETWEEN operator allows you to select rows of data in a given
column if data in a given column contain values within a range. The
general form of this operator is:
expression [NOT] BETWEEN lower value AND upper value
The condition is true if the expression is greater than or equal to the lower value and less than or equal to the upper value. If the NOT operator is used, the row is retrieved if the expression is less than the lower value or greater than the upper value.
Example: Let's find all departments whose budgets are between $15,000 and $25,000.
If you enter the statement:
SELECT DNAME, BUDGET
FROM DEPARTMENT
WHERE BUDGET BETWEEN 15000 AND 25000 ;
the result displayed will be:
DNAME BUDGET Product Marketing and Sales 25000 Corporate Library 18500 Information Systems Management 22500 |
The name of each department whose budget is between $15,000 and $25,000 is retrieved. The limits include any budget of $15,000 and of $25,000; thus the Product Marketing and Sales Department with a budget matching the upper limit has been included.
The AND logical operator can also be used to form a query that selects values from a range. A query similar to the last example would look like the following.
If you enter the following statement:
SELECT DNAME, BUDGET
FROM DEPARTMENT
WHERE BUDGET >= 15000 AND BUDGET <= 25000 ;
the result displayed will still be:
DNAME BUDGET Product Marketing and Sales 25000 Corporate Library 18500 Information Systems Management 22500 |
Notice that the results are identical to the output in example where
BETWEEN was used in the WHERE
clause.
The BETWEEN operator can be modified with the logical operator NOT so that rows outside a range will be selected.
Example: List the names of all departments who do not have a budget in the range of $15,000 to $25,000.
If you enter the statement:
SELECT DNAME, BUDGET
FROM DEPARTMENT
WHERE BUDGET NOT BETWEEN 15000 AND 25000 ;
the result displayed will be:
DNAME BUDGET Corporate Legal Support 28000 Supplies and Procurement 10500 Customer Support and Service 11000 Manufacturing 32000 Research and Development 27500 Strategic Planning and Intelligence 28500 |
This statement retrieves the names of all departments with budgets lower than $15,000 or higher than $25,000.