How can I convert all characters in a string to lowercase in Databricks SQL or Databricks Runtime?
You can use the `lower()` function to convert all characters in a string to lowercase in Databricks SQL or Databricks Runtime. Here's an example:

> SELECT lower('LowerCase');

This will return `lowercase` as the result.

The `lower()` function takes a STRING expression as an argument and returns a STRING with all characters changed to lowercase. It is similar to the `lcase()` function and can be used interchangeably. Other related functions include `initcap()` for capitalizing the first letter of each word in a string, and `ucase()` or `upper()` for converting all characters in a string to uppercase.