Postgres and Open Source Experts

Postgres provides a couple of ways to drop all the tables of a Postgres database, such as dropping the complete schema or removing the schema’s tables individually.

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.

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.

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.

The TO_TIMESTAMP() in Postgres is a built-in function for converting a string to a timestamp data type. Users can easily manipulate and analyze DateTime information using this function.