20 Oct 2022 Dominika Florczykowska What Does a Double Colon Operator in PostgreSQL Do? The double colon operator :: in PostgreSQL is a synonym for CAST, which converts a value into a different data type. If you are curious about the details , read on! Have you ever seen a double colon (::) operator in someone’s PostgreSQL code? It would look something like this: SELECT '2022-09-02'::date; This code converts the text '2022-09-02' to a date datatype. As mentioned above, the double colon replaces the CAST operator. Read more 22 Feb 2022 Dominika Florczykowska An Overview of MySQL Data Types What data types are available in a MySQL database? In this article, you’ll learn about numeric data types, text data types, and much more! You may have seen our article about data types in SQL. Here, we focus on the MySQL data types. We will discuss the most commonly used ones: numeric, text, and date and time. If you are interested in the topic, be sure to check out our Data Types in SQL course. Read more