Postgres and Open Source Experts

PostgreSQL offers a GRANT statement that is used to assign privileges to the database objects. In Postgres, you can grant all privileges to a user via the "GRANT ALL" statement.

UNIQUE constraints can be dropped by running the ALTER TABLE command with the "DROP CONSTRAINT" clause followed by the constraint’s name.

PostgreSQL provides a built-in DIV() function that takes two numeric values as arguments, performs division on them, and retrieves the resultant integer.

In Postgres, double hyphen “--” sign is used for single-line comments, while to use multi-line comments, you need to enclose the comments within “/*” and “*/”.

To create an array in Postgres, users must specify the column name, then the data type, followed by the square brackets “[]”.

Postgres' UPPER() function accepts a string as an argument and converts the string’s case to upper. It can accept any character string, such as CHAR, TEXT, and VARCHAR.

PostgreSQL provides a built-in string function named LOWER() that accepts a string as an argument and converts it into lowercase.

In PostgreSQL, the FLOOR() function is one of the math functions that accept a numeric value or expression and round down the given number to the nearest integer/whole number.

TRIM() is an inbuilt function in Postgres that accepts a string and deletes the leading, trailing, or both leading and trailing spaces or characters from a string.

PostgreSQL provides a built-in function named MD5 that accepts a string as an argument and converts it into a 32 characters text string. It retrieves the resultant value in the hexadecimal.