The AND operator is one of several logical operators available in SQLite that allows you to combine two or more conditions in a WHERE clause to filter the results of a SELECT statement.
The AND operator is used to combine multiple conditions in a WHERE clause to form a more specific query. The operator works by evaluating both conditions and returning only the records that satisfy both of them. For example, consider the following SQL query:
SELECT * FROM employees WHERE department = 'sales' AND salary > 50000;
In this query, the AND operator is used to combine two conditions. The first condition specifies that only employees who work in the sales department should be returned, while the second condition specifies that only employees with a salary greater than 50000 should be returned. The resulting query will return only those employees who meet both of these criteria.
It is important to note that the AND operator has a higher precedence than the OR operator, which means that any AND operations will be evaluated before any OR operations in a WHERE clause. For example, consider the following query:
SELECT * FROM employees WHERE department = 'sales' OR department = 'marketing' AND salary > 50000;
In this query, the AND operator is evaluated before the OR operator. This means that only employees who work in the marketing department with a salary greater than 50000 will be returned, in addition to all employees who work in the sales department.
In conclusion, the AND operator in SQLite allows you to combine two or more conditions in a WHERE clause to filter the results of a SELECT statement, returning only those records that satisfy all of the conditions specified. It is an important tool for creating complex queries that can help you retrieve the data you need from your database.