Postgres and Open Source Experts

CHECK constraints in PostgreSQL allow us to specify Boolean conditions for inserting or updating values in one or more columns.

PostgreSQL offers a Pseudo-type known as SERIAL. It allows Postgres users to create auto-incremented columns in a table. Using SERIAL, you can create a sequence of integers.

The NOT NULL constraint ensures that the column accepts only non-null values. In Postgres, the CHECK constraint can be used as an alternative to the NOT NULL.

PostgreSQL offers a built-in mathematical function named ABS() that takes an expression as an argument and retrieves an absolute value for the specified number.

PostgreSQL offers several built-in math functions such as ROUND(), CEIL(), and FLOOR() to round a number up to specific decimal places.

PostgreSQL offers several commands to optimize, improve or maintain the health of a database, tables, etc., such as ANALYZE and VACUUM commands.

In Postgres, VACUUM is a command-line utility that vacates the space engaged by obsolete records, tuples, etc. It optimizes the performance of the Postgres databases, records, etc.

The MOD() function is one of the built-in mathematical functions in Postgres that perform the modulo operation on two numbers and retrieves the remainder.

PostgreSQL offers a convenient command named ANALYZE that collects the statistics about a database, table, or table’s columns for the query planner.

In PostgreSQL, column aliases are temporary alternative names assigned to columns. The aliases are temporary alternatives, so they exist temporarily during the query’s execution.