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Education

This is the Education section of the Command Prompt Website. Here you will find blogs specifically about how to use Postgres and related technologies.

How to Change the Timezone of a Postgres Database

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

GREATEST() and LEAST() Functions in PostgreSQL

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

PostgreSQL Data Type Formatting Functions

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.

How to Update an Existing Table in PostgreSQL

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

How to Alter/Modify a VIEW in PostgreSQL

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.

PostgreSQL Create User With Password

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.

PostgreSQL Create Table From CSV File

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.

How to Concatenate Multiple Arrays in PostgreSQL

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

How to Set the Default User Password in PostgreSQL

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.

How to Round Timestamps in PostgreSQL

In PostgreSQL, the DATE_TRUNC() function is a convenient way for truncating/rounding the timestamps to the desired level of precision.