Postgres and Open Source Experts

In PostgreSQL, the LENGTH() function is used to find the length of a string. It takes a string as a parameter and returns the total number of characters.

PostgreSQL provides several ways to describe a table. For example, the “\d” command, “\dt” command, and information_schema.

In PostgreSQL, the DELETE statement is used with the collaboration of the WHERE clause and IN operator to delete multiple rows from a table.

The INSERT INTO statement is used to insert single or multiple rows into a table. To insert multiple rows in a table, the comma-separated syntax is used.

PostgreSQL provides a FETCH clause that is used to fetch/retrieve a part of rows returned by any query. It performs the same functionality as the LIMIT clause.

PostgreSQL provides several methods for truncating a specific table. The TRUNCATE TABLE command is one of them. It can be executed from the psql and pgAdmin.

In PostgreSQL, the BETWEEN operator is used to find a match against a range of values in SELECT, UPDATE, INSERT or DELETE queries.

In PostgreSQL, the IN operator is used with the collaboration of the WHERE clause to check the existence of a particular value in a list of values.

In Postgres, the HAVING clause is mostly used with the GROUP BY clause to filter the group/aggregate based on some specific condition.

In PostgreSQL, the DISTINCT keyword/clause is used within the SELECT statement to fetch the unique records from the result-set.