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The WHERE keyword is used to specify a criterion
or condition, criteria or conditions, that a SQL statement must follow to
perform its operation.
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The WHERE keyword can be used in a SELECT
statement to specify what criterion the statement must follow to select
one or more records. The formula to follow is:
SELECT What FROM WhatObject WHERE Expression;
Here is an example where all records are selected from
a table but only records where the Gender value is Male would be kept:
SELECT * FROM Students WHERE Gender="Male";
Here is an example where the names of of tables and
columns are included in square brackets and the names of columns are
qualified with periods:
SELECT [Students].[FirstName], [Students].[LastName]
FROM [Students]
WHERE [Students].[Gender]="Male";
Here is an example that uses the <> operator:
SELECT * FROM Students WHERE Gender <> "Male";