What is NULLIF() and How to Use it in PostgreSQL? It is a built-in function in Postgres that accepts a couple of arguments and retrieves a NULL value if both arguments are equal or if either of the specified arguments is NULL. It retrieves the first argument if both arguments are not...
To overcome the limitations of a function, PostgreSQL has a procedure that supports transactions. In the procedure, we can start, commit, rollback the transaction. However, the procedure can not return a result set like a table. It can only return the INOUT parameters. Syntax CREATE OR REPLAC...
A single PostgreSQL server can contain many databases. Let’s explore three different approaches to list databases in PostgreSQL!
For this tutorial, we are going to run a PostgreSQL container for Docker (from thedatagrip-documentationrepository). In theDockerdirectory of the repository, you can find.envanddocker-compose.ymlfiles..envincludes credentials for the PostgreSQL service.docker-compose.ymldefines how the service is c...
On the first node only, aspostgresuser modify thepostgresql.conffile. The steps below are used for creating a replicated database instance for use with promotablepgsqlpacemaker resource: Below are the settings which should be included, and these can be appended to the bottom of the configuration...
Just like in most databases, in PostgreSQL a trigger is a way to automatically respond to events. Maybe you want to run a function if data is inserted into a table. Maybe you want to audit the deletion of data, or simply respond to some UPDATE statement. That is exactly what a trigger...
PostgreSQL provides a set of powerful tools that can help in converting different data types. These can be a date, integer, float, to formatted strings. One of the functions which is widely used for this purpose is the TO_CHAR function. The TO_CHAR function in PostgreSQL is used to conver...
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The objective of this write-up is to learn how to convert a string into a number using different examples. So, let’s get started! What is the Need for Converting a String into a Number in PostgreSQL? Suppose we have a numeric value residing in the string data type (i.e., numeric ...
Introduction to the SQRT Function Function Objective: The SQRT functionin Excel returns the square root of a number. Syntax: =SQRT(number) Arguments Explanation: Return Parameter:The ExcelSQRTfunction returns the square root of a positive number like for number 4 it returns the value 2. ...