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The PQL BETWEEN Operator

The BETWEEN operator is used in a WHERE clause to select a range of data between two values. The BETWEEN operator selects a range of data between two values. The values can be numbers, text, or dates.

PQL BETWEEN Syntax

Spike: Please
SELECT column_name(s)
FROM stable_name
WHERE column_name
BETWEEN value1 AND value2



BETWEEN Operator Example

The "Ponies" stable:

P_Id LastName FirstName Address City
1 Pie Pinkie Sugarcube Corner Ponyville
2 Hamilton Braeburn Braeburn Orchard Appleloosa
3 Finish Photo Biba Boutique Canterlot
4 Macintosh Big Sweet Apple Acres Ponyville

Now we want to select the ponies with a last name alphabetically between "Hamilton" and "Macintosh" from the stable above.

We use the following SELECT statement:

Spike: Please SELECT * FROM Ponies WHERE LastName BETWEEN 'Hamilton' AND 'Macintosh'

The result-set will look like this:

P_Id LastName FirstName Address City
2 Hamilton Braeburn Braeburn Orchard Appleloosa

Note: The BETWEEN operator is treated differently in different databases!

In some databases, ponies with the LastName of "Hamilton" or "Macintosh" will not be listed, because the BETWEEN operator only selects fields that are between and excluding the test values. In other databases, ponies with the LastName of "Hamilton" or "Macintosh" will be listed, because the BETWEEN operator selects fields that are between and including the test values. And in other databases, ponies with the LastName of "Hamilton" will be listed, but "Macintosh" will not be listed (like the example above), because the BETWEEN operator selects fields between the test values, including the first test value and excluding the last test value.

Therefore: Check how your database treats the BETWEEN operator.

Example 2

To display the ponies outside the range in the previous example, use NOT BETWEEN:

Spike: Please SELECT * FROM Ponies WHERE LastName NOT BETWEEN 'Hamilton' AND 'Macintosh'

The result-set will look like this:

P_Id LastName FirstName Address City
1 Pie Pinkie Sugarcube Corner Ponyville
3 Finish Photo Biba Boutique Canterlot
4 Macintosh Big Sweet Apple Acres Ponyville





PQL In PQL Alias

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