SQL Reference

Example

SELECT * FROM Customers
WHERE Country='Germany' AND City='Berlin';

Output

CustomerID | CustomerName | ContactName | Address | City | PostalCode | Country
---        | ---          | ---         | ---     | ---  | ---        | ---
1          | Alfreds      | Maria       | Obere Str. 57| Berlin | 12209 | Germany
2          | Blauer See   | Henna       | Forsterstr. 57| Berlin | 14163 | Germany

Explanation

The code illustrates a simple usage of the AND logic operator in SQL. AND is used to filter records based on multiple conditions. In this case, it selects customers from the Customers table that are both in the Country ‘Germany’ and the City ‘Berlin’. The output provides a list of customer details who fulfill both conditions.

Example

SELECT *
FROM orders
WHERE order_date >= '2020-01-01' AND total_amount > 100;

Output

| order_id | customer_id | order_date  | total_amount |
|----------|-------------|-------------|--------------|
| 00001    | CUST002     | 2020-05-01  |  150         |
| 00002    | CUST001     | 2020-10-20  |  200         |

Explanation

The above SQL statement selects all columns from the orders table where the order_date is greater than or equal to ‘2020-01-01’ AND the total_amount is greater than 100. Thus, it only returns records that meet both conditions.

Example

SELECT *
FROM [Employees]
WHERE [Salary] > 50000 AND [Age] < 30;

Output

EmployeeID  FirstName   LastName    Salary  Age
----------------------------------------------
3           John        Doe         60000   28
5           Jane        Smith       55000   27

Explanation

In this example, the SQL query is used to get data from the Employees table for those employees who both earn more than 50000 and are younger than 30 years. The AND logical operator ensures both conditions are satisfied for the rows returned from the query.

Example

SELECT *
FROM employees
WHERE salary > 50000 AND job_id = 'IT_PROG';

Output

| EMPLOYEE_ID | FIRST_NAME | LAST_NAME | EMAIL | PHONE_NUMBER | HIRE_DATE | JOB_ID | SALARY | MANAGER_ID | DEPARTMENT_ID |
|-------------|------------|-----------|-------|--------------|-----------|--------|--------|------------|---------------|
| 200         | Jennifer   | Whalen    | JWHALEN| 515.123.4444 | 17-JUN-87 | IT_PROG| 60000  | 101        | 10            |
| 205         | Shelley    | Higgins   | SHIGGINS| 515.123.8080 | 07-JUN-90 | IT_PROG| 120000 | 101        | 10            |

Explanation

In the SQL query provided in the example, it selects all data from the ‘employees’ table where the salary is greater than 50000 AND job_id is ‘IT_PROG’. The AND operator combines two Boolean expressions and returns true only if both expressions are true. Therefore, only rows that fulfill both conditions are shown in the output.

Example

SELECT Firstname, Lastname
FROM Customers
WHERE Country='Germany' AND City='Berlin';

Output

| Firstname | Lastname |
|-----------|----------|
| John      | Doe      |

Explanation

The above SQL statement selects customers from the “Customers” table that are located in “Berlin”, Germany. The AND operator combines two conditions that must both be true for the row to be included in the result set.