AND - (PostgreSQL Conditions)
In PostgreSQL, the AND operator is used to combine two or more conditions and return only rows that meet both conditions. In this tutorial, we'll take a look at the syntax, example, output, explanation, use, important points, and summary of the AND operator in PostgreSQL.
Syntax
SELECT column1, column2, ...
FROM table_name
WHERE condition1 AND condition2 AND conditionN;
Example
Let's take a look at an example of using the AND operator in PostgreSQL.
SELECT *
FROM employees
WHERE department = 'Sales' AND salary > 50000;
In this example, we're selecting all columns from the employees table where the department is 'Sales' and the salary is greater than 50000.
Output
The above SQL statement will return the following output.
| employee_id | first_name | last_name | phone_number | hire_date | job_title | salary | commission | manager_id | department_id | |
|---|---|---|---|---|---|---|---|---|---|---|
| 4 | John | Doe | john.doe@example.com | 555-555-1212 | 2015-01-01 | Sales Representative | 60000 | 0.10 | 2 | 2 |
| 5 | Jane | Smith | jane.smith@example.com | 555-555-2121 | 2016-02-02 | Sales Manager | 90000 | 0.15 | 3 | 2 |
Explanation
In the above example, we're selecting all columns from the employees table where the department is 'Sales' and the salary is greater than 50000. The AND operator is used to combine the two conditions, and only the rows that meet both conditions are returned.
Use
The AND operator can be used to combine two or more conditions to create more complex queries. It is useful when you need to return only rows that meet multiple conditions.
Important Points
- Each condition in the
ANDoperator must evaluate to true in order for the row to be returned. - You can combine the
ANDoperator with other logical operators, such asOR, to create more complex queries. - Be sure to use parentheses to group conditions and avoid unexpected results.
Summary
In this tutorial, we discussed the AND operator in PostgreSQL conditions. We covered the syntax, example, output, explanation, use, important points, and summary of the AND operator. With this knowledge, you can now use the AND operator to create more complex queries in your PostgreSQL database.