Experts in Postgres and Open Source Infrastructure

24x7, 365 Enterprise services since 1997

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 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.

How to Use DELETE Query in PostgreSQL

In PostgreSQL, the DELETE query can be used with or without the WHERE clause to delete a single, multiple, or all the rows of a specific table.

How to Use Update Query in PostgreSQL

In PostgreSQL, the UPDATE query is used with the assistance of the SET clause to update or modify the table’s record/data.

How to Use Select Query in PostgreSQL

The SELECT statement is used to fetch one or more columns of a table. It returns a resultant table which is known as the result set or result table.

How to Use Insert Query in PostgreSQL

In PostgreSQL, the “INSERT INTO” statement is used to add/insert an individual or multiple records into a specific table.

How to Use AND & OR Operators in PostgreSQL

In PostgreSQL, the AND and OR operators are used to combine more than one condition and are referred to as conjunctive, logical, or boolean operators.

How to Use WHERE Clause in PostgreSQL

In PostgreSQL, the WHERE clause is used to filter the results of different statements such as SELECT, DELETE, UPDATE, etc.