在 SQL 上将时间转换为 integer

Question

I am trying to calculate the average of ride_length (hh:mm:ss format) on Big Query. ride_length For example, I am aiming for a result result that says 1 instead of 01:00:00.

I tried using the CAST function to convert it into an integer but it didn't work. I also tried following the steps of answers to questions similar to mine but they didn't work as well.

Answer 1

You can use Extract function which will return the specified part of the time expressions. You can try the below queries.

To extract hour from the TIME expression you can consider the below query.

Query:

SELECT EXTRACT(HOUR FROM TIME "01:00:00") as hour;

Output:

To extract hour from TIMESTAMP expression below query can be considered.

Query:

select EXTRACT(hour from timestamp "2023-01-13 15:30:00" AT TIME ZONE "America/Los_Angeles") as hour

Output: