Experts in Postgres and Open Source Infrastructure

In PostgreSQL, the COALESCE() function and the IS NULL operator are used to find and replace the null values with some default values.

The INTERVAL keyword is used to define an interval in Postgres. This blog explained the usage of the INTERVAL data type in Postgres via suitable examples.

This blog presented a cheat sheet that assists us in working with the Postgres databases, schemas, tables, and users/roles, efficiently.

The ALTER TABLE command in PostgreSQL is used to alter the tables' structure, such as adding columns, renaming columns/tables, dropping columns, modifying constraints, etc.

In Postgres, the standard “information_schema”, a system catalog table named “pg_namespace”, and the “\dn” command is used to get the list of available schemas.

PostgreSQL provides different built-in commands and queries to get the list of all the tables, such as the “\dt” command, “pg_tables”, “information_schema”, etc.

In Postgres, the IS NULL operator tests whether an expression/column contains a null value. It can be used with different statements, such as SELECT, UPDATE, etc.

Postgres provides different commands to find the list of users, databases, schemas, or tables, such as the “\du”, “\l”, “\dn”, and “\dt” shows the list of users, databases, schemas, and tables, respectively.

The PostgreSQL “TIMESTAMP” or “TIMESTAMP WITHOUT TIME ZONE” data type stores a timestamp value without the time zone information.

The PostgreSQL “TIMESTAMPTZ” or “TIMESTAMP With TIME ZONE” data type is used to store a timestamp value that includes the time zone information.