Postgres and Open Source Experts

In PostgreSQL, the DROP and DROP IF EXISTS statements are used to delete any existing database object. We can drop a database, table, column, function, any extension, etc. in Postgres by using the DROP or DROP IF EXISTS statements. These statements do the same job of dropping an object but they also have a difference in their working. We will specifically talk about the DROP FUNCTION IF EXISTS statement.

The …

We can extract the first and last n characters from a table column and use them as per our needs. This can be done by utilizing the LEFT() and RIGHT() functions of PostgreSQL.

The inet_client_port() function gives the IP port number of the current client and the inet_server_port() function returns the IP port number of the server

To drop a tablespace in Postgres, execute the DROP TABLESPACE statement followed by the name of the tablespace to be discarded.

To alter a tablespace in PostgreSQL, the “ALTER TABLESPACE” statement is used with “RENAME TO”, “OWNER TO”, and “SET” clauses.

To log queries in Postgres, first, locate the config file, then locate the data directory path. After that, configure the configurations and direct the output to the log file.

The UPDATE statement updates the table's data with the new values provided in the query. While the UPDATE FROM statement updates a table's data in accordance with the values of the other table.

There are four methods to write the case-insensitive matching in PostgreSQL. Those are CITEXT extension, LOWER() function, ILIKE operator, and Case conversion.

To Connect to PostgreSQL From VS Code, launch the VS Code, press “CTRL + Shift + X” to open the Extensions view, select the “PostgreSQL” extension, and Install” it.

The transaction_timestamp() function returns the timestamp for the current transaction. This function does not need any argument.