On the first node only, as postgres user modify the postgresql.conf file. The steps below are used for creating a replicated database instance for use with promotable pgsql pacemaker resource: Below are the settings which should be included, and these can be appended to the bottom of the co...
you can iterate a loop in reverse order, set/change the step size, loop through only specific records of a result set, etc. Also, you can use the for loop in a nested structure to iterate over multidimensional
PostgreSQL 9.5+ Installation of these components is falls outside the scope of this article, but if you need help, you can check out instructions on how to install PHP 7.3 (RHEL/CentOS, Ubuntu) and PostgreSQL (RHEL/CentOS, Ubuntu). Installing Laravel To install Laravel, simply use Composer ...
We can use the LIMIT and OFFSET clauses together to change the number of records to display. The example above shows that table “Album” has 306 records. OFFSET skips the first 300 records, and then LIMIT 1 and 2 place limits on the returning rows that are displayed. Example 4 Using L...
Do you want to use PostgreSQL Analytics? Have you looked all over the internet to find a solution for it? If yes, then this blog will answer all your queries. With many cloud-based data warehouse services becoming popular, using a traditional relational database for your analytics is not a...
GROUP BY product ORDER BY total_price DESC; The query performs the same function as the above one and additionally, it will order the product prices in descending order. The output looks like this: So this is how we use theSUM()function and theGROUP BYfunction together. ...
When working with databases you can choose to use the primitives offered by the database, or use a library that builds on top and abstract the tiny details for you.Sequelize is one of those libraries, and it’s a very popular Node.js wrapper for PostgreSQL, MySQL and other databases....
ORDER BY s.department_id DESC We have defined an expression (s.department_id) for a DISTINCT ON clause to ORDER the result set in the above statement. Output: Conclusion We hope from the above article, you have understood how to use PostgreSQL SELECT DISTINCT statement to return unique rows...
the whole table; this clause is also used with the offset clause to fetch records from the table. We can use this clause with an order by clause to find ascending and descending numbers; it is the best way to find the top and bottom value of rows using a limit clause in PostgreSQL. ...
With a role configured for PostgreSQL, you can now create a new Rails application that is set up to use PostgreSQL as a database. First, navigate to your home directory: cd~ Copy Create a new Rails application in this directory, replacingappnamewith whatever you would lik...