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Education

This is the Education section of the Command Prompt Website. Here you will find blogs specifically about how to use Postgres and related technologies.

How to Insert Multiple Rows to a Table in PostgreSQL

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.

How to Use FETCH Clause in PostgreSQL

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.

How to Use the Truncate Table Command in PostgreSQL

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.

How to Use BETWEEN Operator in PostgreSQL

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

How to Use IN Operator in PostgreSQL

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.

How to Use HAVING Clause in PostgreSQL

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

How to Use DISTINCT Keyword in PostgreSQL

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

How to Use GROUP BY Clause in PostgreSQL

In PostgreSQL, the GROUP BY clause is used along with the SELECT statement to group several rows having identical data returned by the SELECT statement.

How to Use ORDER BY Clause in PostgreSQL

In PostgreSQL, specify the ORDER BY clause and column name followed by the ASC or DESC to sort the result set in ascending or descending order, respectively.

How to Use LIMIT Clause in PostgreSQL

In PostgreSQL, the LIMIT clause and OFFSET clause allow us to retrieve only a subset of data returned/generated by the SELECT query.