Learn how to use the PostgreSQL WITH clause to create temporary result sets that can simplify your SQL queries and improve readability.
The PostgreSQL LIMIT clause is used to control the number of rows returned by a query. This is particularly useful when working with large datasets or implementing pagination in applications. The LIMIT clause is often paired with the OFFSET clause to skip a certain number of rows before fetching...
Examples to Implement PostgreSQL INNER JOIN with Two Tables Below are the examples mentioned for two tables: Example #1 Each student will have a branch assigned. The branch_id field establishes the link between two tables. You can use the INNER JOIN clause to join the student table to the Br...
The group by Clause is used with the having Clause in PostgreSQL. Without group by Clause, we cannot use the having Clause; we need to define the having Clause before using group by Clause in PostgreSQL. Data from the employee table is being retrieved in the example below. In the first e...
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a partial, or a complete table can be copied. Different clauses can be used with the “SELECT INTO” statement to perform different operations on the tables, such as the WHERE, INNER JOIN, GROUP BY, etc. This post explained different use cases of the SELECT INTO statement in PostgreSQL....
statement to create or formulate a query/expression. It can be used with any statement or clause where an expression can be used, such as with a WHERE clause, with the SELECT statement, etc. This post has presented various examples to explain the usage of the case statement in PostgreSQL....
Using CASE in Different Parts of a Query The versatility of the CASE expression shines when it’s used in various segments of an SQL query. In the SELECT Clause You’ve already seen this in action in the previous examples, where we classified student performance based on grades or scores. ...
Writing a CTE in SQL Server is done in a similar way to writing a CTE in Oracle, MySQL, and PostgreSQL. Let’s take a look at some examples. WITH Clause Example We can use the employee database to demonstrate some examples. The SQL to create the sample data is available at the top...
How to Use UPSERT in PostgreSQL?The term UPSERT combines update and insert, enabling you to insert a new record if it doesn't exist or update the existing one if it does.Starting from PostgreSQL 9.5, UPSERT is achieved with the ON CONFLICT clause.1. Basic UPSERT Syntax...