Boolean Logic in SQL

By Larry Rockoff
Nov 15, 2022

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This chapter is from the book 

The Language of SQL, 3rd Edition

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The AND Operator

The following examples will be taken from this Purchases table:

PurchaseID	CustomerName	State	QuantityPurchased	PricePerItem
1	Kim Chiang	IL	4	2.50
2	Sandy Harris	CA	10	1.25
3	James Turban	NY	5	4.00

Here’s an example of a WHERE clause that uses the AND operator:

SELECT
CustomerName,
QuantityPurchased
FROM Purchases
WHERE QuantityPurchased > 3
AND QuantityPurchased < 7

The AND clause means that all conditions must evaluate to true for the row to be selected. This SELECT specifies that the only rows to be retrieved are those for which the QuantityPurchased is both greater than 3 and less than 7. Therefore, only these two rows are returned:

CustomerName	QuantityPurchased
Kim Chiang	4
James Turban	5

Notice that the row for Sandy Harris is not returned. Why? Sandy purchased a quantity of 10, which, in fact, does satisfy the first condition (QuantityPurchased > 3). However, the second condition (QuantityPurchased < 7) is not satisfied and therefore is not true. When using the AND operator, all conditions specified must be true for the row to be selected.

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