- Boolean: Values can be written as on, off, true, false, yes, no, 1, 0 (all case-insensitive) or any unambiguous prefix of one of these. String: In general, enclose the value in single quotes, doubling any single quotes within the value. Quotes can usually be omitted if the value is a simple number or identifier, however. Numeric (integer and floating point): A decimal point is permitted only.
- One of the most popular and widely-used PostgreSQL client applications is pgAdmin III. This application is free to download and use, and there are versions available for several operating systems, including Microsoft Windows, Mac OS X, and Linux. Using pgAdmin III.
This PostgreSQL tutorial explains how to use the AND condition and the OR condition together in a PostgreSQL query with syntax and examples.
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Description
The PostgreSQL AND condition and OR condition can be combined in a SELECT, INSERT, UPDATE, or DELETE statement.
When combining these conditions, it is important to use parentheses so that the database knows what order to evaluate each condition. (Just like when you were learning the order of operations in Math class!)
Syntax
The syntax for the AND condition and OR condition together in PostgreSQL is:
Parameters or Arguments
condition1, condition2, condition_n are the conditions that are evaluated to determine if the records will be selected.
Note
- The PostgreSQL AND & OR conditions allow you to test multiple conditions.
- Don't forget the order of operation parentheses!
Example - With SELECT Statement
Let's look at an example that combines the AND and OR conditions in a SELECT statement.
For example:
This AND & OR example would return all employees that live in Miami whose first_name is 'Sarah' and all employees whose employee_id is less than or equal to 2000. The parentheses determine the order that the AND and OR conditions are evaluated. Just like you learned in the order of operations in Math class!
The next example takes a look at a more complex statement.
For example:
This AND & OR example would return all employee_id, last_name, and first_name values from the employees table whose the last_name is 'Smith' OR whose last_name is 'Anderson' and the state is 'Florida' OR whose last_name is 'Ferguson', the status is 'Active' and the state is 'California'.
Example - With INSERT Statement
This next AND & OR example demonstrates how the AND condition and OR condition can be combined in the INSERT statement.
For example:
One chat 4 2 – all in one messenger app. This PostgreSQL AND and OR example would insert into the contacts table, all customer_id and customer_name records from the customers table whose last_name is either 'Anderson' or 'Smith' and the customer_id is greater than 340.
Example - With UPDATE Statement
This AND & OR example shows how the AND and OR conditions can be used in the UPDATE statement.
For example:
This PostgreSQL AND & OR condition example would update all status values to 'Active' in the employees table where the either the first_name is 'Jane' or last_name is 'Doe' and the employee_id is greater than 1000.
Example - With DELETE Statement
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![Postico Postico](https://eggerapps.at/postico/screenshots/sql-query-view.png)
Finally, this last AND & OR example demonstrates how the AND and OR conditions can be used in the DELETE statement.
For example:
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This PostgreSQL AND and OR condition example would delete all records from the employees table where the employee_id is greater than or equal to 500 and last_name was either 'Smith' or 'Anderson'.
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Postgres.app
To connect to Postgres.app, you can leave all fields blank.
- Host: localhost
- Port: 5432
- User: your user name
- Password: blank
- Database: your user name
See also: Installing Postgres.app
EnterpriseDB
To connect to a PostgreSQL server installed with the graphical installer from EnterpriseDB, click the “New Favorite” button and provide the following parameters:
- Host: localhost
- Port: 5432 (can be changed during installation)
- User: postgres
- Password: selected during installation
- Database: postgres
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MacPorts
To connect to a PostgreSQL server installed with MacPorts, use the following parameters:
- Host: localhost
- Port: 5432
- User: postgres
- Password: blank
- Database: postgres
Firewalls & Internet Filters
Some protection products interfere with TCP connections. For example, a product named X3 Protect has been known to block connection attempts to local PostgreSQL servers. If you are having trouble connecting to a local PostgreSQL server, try disabling your firewall, or add an exception for port 5432.
“Resolving localhost failed”
This error message usually appears when there is a problem with the /etc/hosts file. Make sure there is an entry for localhost. Code editor panic. As a workaround, you can also type “127.0.0.1” into the host field instead of “localhost”.
TCP vs. Socket connections
There are two ways to connect to a local PostgreSQL server:
- Using a TCP connection (localhost, 127.0.0.1, ::1)
- Using a Unix socket connection (/tmp/.s.PGSQL)
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Postico always uses TCP connections. Postico can't use socket connections because sandboxed apps are not allowed to access unix sockets outside their sandbox.
By default, PostgreSQL is always configured to listen for TCP connections on localhost, so that should not be a problem unless you explicitly disabled TCP connections.