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How to Create a User in PostgreSQL

To create a user in Postgres, specify the “CREATE USER” command followed by the user name, and after that, assign the privileges to the user using the “WITH” clause.

How to Concatenate a String and a Number in PostgreSQL

PostgreSQL allows us to concatenate a string with a number using a built-in “CONCAT()” function or a pipe concatenation operator “||”.

How to Use ALTER USER Statement in PostgreSQL

A Postgres user's attributes can be changed using the ALTER USER statement. Using the ALTER USER command, we can modify/alter the user's password, privileges, etc..

How to Find Logged In Users in PostgreSQL

To find the logged-in users in Postgres, the “pg_stat_activity” view is used. While to find all Postgres users, a system table named "pg_user" is used.

Postgres Length Functions With Practical Examples

Postgres offers various built-in length functions to calculate the length of a string, such as LENGTH(), BIT_LENGTH(), CHAR_LENGTH(), and BYTE_LENGTH().

How to Change a User to Superuser in PostgreSQL

In PostgreSQL, the ALTER USER and ALTER ROLE statements are used along with the SUPERUSER attribute to change an ordinary user to a superuser.

PostgreSQL DROP CONSTRAINT With Practical Examples

In PostgreSQL, Users must execute the DROP CONSTRAINT with the ALTER TABLE command to drop any particular constraint from a Postgres table.

Is NVL() Function Same as COALESCE() in PostgreSQL

PostgreSQL doesn’t support the NVL() function. In Postgres, a built-in function named COALESCE() is used as an alternative to the NVL() function.

How to Rename Tables in Postgres

To rename a particular table in PostgreSQL, use the RENAME TO clause in conjunction with the ALTER TABLE statement.

How to Create a Superuser in PostgreSQL

To create a superuser in PostgreSQL, users must use the CREATE ROLE or CREATE USER statement along with the SUPERUSER attribute.