hour function
Applies to: 
Databricks SQL Databricks Runtime
Returns the hour component of a timestamp. This function is a synonym for extract(HOUR FROM expr).
note
When extracting fields from a TIMESTAMP (TIMESTAMP_LTZ), the result is based on the session timezone.
Syntax
hour(expr)
Arguments
expr: A TIMESTAMP expression.
Returns
An INTEGER.
Examples
SQL
> SELECT hour('2009-07-30 12:58:59');
12