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Overview

The UNIX_MICROS() function returns a given timestamp into a UNIX timestamp in microseconds, from 1970-01-01 00:00:00-00 (can be negative). Its syntax is illustrated below: 
SELECT UNIX_MICRO(TIMESTAMP)
Its input type is a TIMESTAMP expression, and the return data type is BIGINT representing time in microseconds.

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Examples

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Case #1: Basic UNIX_MICROS() function

The below example uses the UNIX_MICROS() function to convert a given timestamp into a UNIX timestamp in microseconds: 
SELECT UNIX_MICRO(TIMESTAMP "2022-12-25 13:30:00+00") AS unix_microsvalues;
The final output will be as follows: 
+-----------------------------+
| unix_microsvalues           |
+-----------------------------+
| 1671975000000000.000000     |
+-----------------------------+

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Case #2: UNIX_MICROS() function using columns

Let’s suppose we have a table named time_example with the following timestamp values: 
CREATE TABLE time_example (
  time_stamp timestamp
);

INSERT INTO time_example VALUES 
('2022-12-25 13:30:00'),
('2021-10-02 06:30:00'),
('2020-09-25 07:25:00');

SELECT * FROM time_example;
The above query will show the following table: 
+-------------------------+
| time_example            | 
+-------------------------+
| 2022-12-25 13:30:00     |
| 2021-10-02 06:30:00     |
| 2020-09-25 07:25:00     |
+-------------------------+
We want to convert all timestamp values into UNIX timestamp values in microseconds. To do that, we have to run the following query: 
SELECT time_stamp, UNIX_MICROS(time_stamp)
AS time_micros
FROM time_example;
The output displays all the timestamp entries in the time_stamp column and the converted UNIX timestamps in microseconds in the column time_micros. 
+-------------------------+--------------------------+
| time_stamp               | time_micros              |
+-------------------------+--------------------------+
| 2022-12-25 13:30:00     | 1671975000000000.000000  |
| 2021-10-02 06:30:00     | 1633156200000000.000000  |
| 2020-09-25 07:25:00     | 1601018700000000.000000  |
+-------------------------+--------------------------+