Postgresql tutorials
In this PostgreSQL tutorial, we will discuss PostgreSQL Date Part Hour to get the hour value from the timestamp. Here we will use the function date_part() to extract the hour component with different examples such as from the current timestamp, interval, and table. What is PostgreSQL Date Part Hour The date_part() function in PostgreSQL returns … Read more >>
In this PostgreSQL tutorial, we will learn about How to Create a Database in PostgreSQL using two methods, using the terminal and the Graphical User Interface (GUI) called pgAdmin. How to Create Database in PostgreSQL Using Terminal Before beginning to create a database, make sure that you have already installed PostgreSQL on your computer. To … Read more >>
In this PostgreSQL tutorial, we will learn about “PostgreSQL Installation on Linux” with how to solve the error when installing PostgreSQL. Additionally, we will delve into the steps to create a new user, and database, and grant privileges within PostgreSQL. Step 1: Update the System Packages Before installing any new software, it’s essential to update … Read more >>
In this PostgreSQL tutorial, we will learn about “Postgresql unique” and cover the following topics. Postgresql unique constraint In Postgresql, we want to ensure that values stored in a column or a group of columns are unique across the whole table such as email addresses or usernames. PostgreSQL provides us with the UNIQUE constraint that keeps … Read more >>
In this PostgreSQL tutorial, we will study the usage of the PostgreSQL subquery that will allow us to create queries within the query. And we are going to discuss the following list of topics. PostgreSQL subquery In PostgreSQL, A query is a question or a request for information expressed. A subquery is a query within … Read more >>
In this PostgreSQL tutorial, we will learn about “Postgresql while loop” and cover the following topics. Introduction to while loop When we need to perform the same task again and again then we use the while loop or while loop is used where the task is repetitive. Suppose that we want the population of the city … Read more >>
In this PostgreSQL tutorial, we will learn about “Postgresql regexp_replace” and cover the following topics. Postgresql regexp_replace In Postgresql, the REGEXP_REPLACE function replaces substrings that match a POSIX regular expression with a new substring. The syntax of regexp_replace is given below. Where the source is a string where the replacement will take. pattern: The pattern … Read more >>
In this PostgreSQL tutorial, we are going to learn about Drop Database psql. Here we will learn how to use the drop queries available in PostgreSQL, and we will also cover the following list of topics. Drop database psql If a PostgreSQL database is no longer required, we drop it by using the DROP DATABASE … Read more >>
In this PostgreSQL tutorial, we are going to learn about PostgreSQL List Databases. Here we will learn how to list databases available in PostgreSQL, and we will also cover the following list of topics. PostgreSQL List Databases: Now, we will learn the way to list databases in the PostgreSQL database server. In MySQL, we used to … Read more >>
MySQL is faster and is used for small organizations but with MySQL, you can’t perform complex and advanced queries. But with PostgreSQL, you can perform such kinds of queries, moreover, it provides analytics or data mining environment. PostgreSQL has abilities for querying optimization, giving better query responses compared to MySQL. There is a tool called … Read more >>
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