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SQL WHERE Keyword

SELECT

The WHERE command filters a result set to include only records that fulfill a specified condition.

The following SQL statement selects all the customers from "Mexico" in the "Customers" table:

Example

SELECT * FROM Customers
WHERE Country='Mexico';

SQL requires single quotes around text values (most database systems will also allow double quotes).

However, numeric fields should not be enclosed in quotes:

Example

SELECT * FROM Customers
WHERE CustomerID=1;

Note: The WHERE clause is not only used in SELECT statement, it is also used in UPDATE, DELETE statement, etc.!

The following operators can be used in the WHERE clause:

Operator Description
= Equal
<> Not equal. Note: In some versions of SQL this operator may be written as !=
> Greater than
< Less than
>= Greater than or equal
<= Less than or equal
BETWEEN Between a certain range
LIKE Search for a pattern
IN To specify multiple possible values for a column

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