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How to Import or Export CSVs to PostgreSQL Using pgAdmin

This post demonstrates stepwise instructions for importing CSV to Postgres or exporting Postgres tables to CSV files using pgAdmin.

How to Import or Export CSV Files to PostgreSQL Using psql

PostgreSQL allows us to import CSV files to Postgres tables or export Postgres tables to CSV files using SQL Shell (psql). To do that, the “\COPY” command is used.

How to Combine Two Tables Using INNER JOIN in PostgreSQL

Postgres provides an INNER JOIN clause to combine the records of multiple tables based on a specific condition/criteria.

How to Drop All Tables in PostgreSQL?

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.

How to Replace Null Values With Default Values in PostgreSQL

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

PostgreSQL INTERVAL Data Type With Examples

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.

PostgreSQL - ALTER TABLE Command With 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.

How to List Schemas in PostgreSQL

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 - How to List All Available Tables?

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.

PostgreSQL IS NULL Operator/Condition

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.