unix_micros function
Applies to: 
Databricks SQL Databricks Runtime
Returns the number of microseconds since 1970-01-01 00:00:00 UTC.
Syntax
unix_micros(expr)
Arguments
expr: A TIMESTAMP expression.
Returns
A BIGINT.
Examples
SQL
> SELECT unix_micros(TIMESTAMP('1970-01-01 00:00:01Z'));
1000000