Experts in Postgres and Open Source Infrastructure

In PostgreSQL, the built-in DATE() function, CAST operator, and scope resolution operator “::” are used to extract a date from a TIMESTAMP.

PostgreSQL provides an “ALTER DATABASE” command that is used with the “SET TIMEZONE” clause to change the timezone of a Postgres database.

In PostgreSQL, the GREATEST() and LEAST() are built-in functions used to get the biggest and smallest value from the given data, respectively.

Postgres provides various built-in formatting functions such as TO_CHAR(), TO_TIMESTAMP(), etc. that allows us to convert data from one type to another based on some valid format.

In PostgreSQL, the ALTER TABLE command updates the table’s structure, such as adding a new column, renaming a column, changing data type, etc.

Postgres, the “CREATE OR REPLACE VIEW” command is used to modify the view’s definition. The ALTER VIEW command allows us to alter the view’s auxiliary properties.

In PostgreSQL, the “CREATE USER” command is used to create a new user. To create a user with the password, execute this command with the “PASSWORD” attribute.

In PostgreSQL, creating a table from a CSV file means importing a CSV file into the Postgres table. For this, execute the COPY command to create a Postgres table via the CSV file.

PostgreSQL provides a built-in function named ARRAY_CAT() and a concatenation operator “||” that assists us in concatenating multiple arrays into a single array.

Execute the “ALTER USER” or “ALTER ROLE” command, followed by the default user name and the PASSWORD attribute to set the default user password in PostgreSQL.