Postgres and Open Source Experts

In Postgres, the ARRAY_LENGTH() is used to find the array's length. The ARRAY_LENGTH() function finds the array’s length based on the requested dimension.

If a VIEW to be dropped doesn’t exist, then Postgres throws a VIEW doesn’t exist error. To rectify this error, the “IF EXISTS” option is used with the DROP VIEW statement.

Postgres provides the “CREATE VIEW”, “CREATE OR REPLACE VIEW”, and “DROP VIEW” statements to create, update or drop a view from the database.

The POWER() or POW() function accepts two numeric values as arguments and retrieves the first value raised to the power of the second value.

To sort the table’s data into a specific format, the ORDER BY clause is used in Postgres. Postgres users must use the ORDER BY clause on the DATE type column to sort the table data by date.

ALIASES are used in Postgres to provide a temporary name to the columns, tables, etc., while executing/writing Postgres queries.

In Postgres, the “column doesn’t exist” error occurs because of various reasons, such as the searched column doesn’t exist, typo mistakes, column alias being used incorrectly, etc.

To define an auto-incremented primary key in Postgres, specify a column name followed by a pseudo data type named “SERIAL”, and then specify the PRIMARY KEY keyword.

PostgreSQL offers an ARRAY_TO_STRING() function that accepts three arguments: an array, a delimiter, and a text to replace the null values.

The LIKE operator matches the search expression with the specified pattern and retrieves true if the match is found. The NOT LIKE operator negates the results of the LIKE operator,.