267. String functions

This lesson covers all scalar functions from the course that deal with strings:

CONCAT(text1, text2, …)

The CONCAT() functions accept the arbitrary number of arguments and joins them together.

It’s really useful to generate URL-s from the database records. Here’s an example of such a query:

SELECT id, name, genre, CONCAT('https://admin.bindle.com/books/', id, '/edit') AS admin_tool_url FROM books

LENGTH(text)

The LENGTH() function returns the number of characters in the text input:

SELECT LENGTH(first_name) FROM users ORDER BY 1 DESC

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