Postgres and Open Source Experts

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.

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

PostgreSQL provides a RENAME COLUMN clause that is used with the collaboration of ALTER TABLE command to rename a column.

In PostgreSQL, the “ALTER TABLE” and “ALTER COLUMN” commands, along with the TYPE Keyword, are used to change/modify the data type of any specific column.

In PostgreSQL, the DROP COLUMN command is used with the collaboration of the ALTER TABLE command to drop single or multiple columns.

In PostgreSQL, the ADD COLUMN command/statement along with the ALTER TABLE clause is used to add single or multiple columns to a table.

In PostgreSQL, the ALTER TABLE command serves multiple functionalities on a table like adding a column, dropping a column, renaming a table/columns, etc.

To drop/delete a table from the PostgreSQL database, open the SQL SHELL and type the DROP TABLE command followed by the table name.

Execute the DROP DATABASE command from psql while dropdb command from the command prompt to remove/drop any specific PostgreSQL database.

There are multiple ways to select or access a PostgreSQL database, such as Command Prompt (cmd), SQL SHELL (psql), and pgAdmin 4.