The examples you have seen so far perform filtering on a query based on only a single condition. To provide greater control over a result set, MySQL enables you to combine a number of conditions in a WHERE clause. They are joined using the logical operator keywords AND and OR.
After adding a WHERE clause to filter a query, you can filter the results further by adding another condition with the AND operator.
This is commonly used to restrict the query results based on the values of two or more columns, as shown in the following example:
mysql> SELECT * From orders -> WHERE customer_code = 'Scicorp' -> AND order_date >= '2006-02-01'; +----+---------------+------------+ | id | customer_code | order_date ...