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sqldatetimetimestampamazon-redshiftsql-function
skippynk
skippynk

Reputation: 55

Function to convert epoch to timestamp in Amazon Redshift

I'm working on Amazon Redshift database and I have dates in milliseconds since epoch. I want to convert that to timestamp, and writing this query that I found on another thread

SELECT TIMESTAMP 'epoch' + column_with_time_in_ms/1000 *INTERVAL '1 second'
FROM table_name LIMIT 1000;

gives me the result in YYYY-MM-DD HH:MM:SS.

My question is: How do I write a SQL function in Redshift that takes integer parameter that are the milliseconds and does this conversion?

Thanks.

Upvotes: 1

Views: 2369

Answers (1)

GMB
GMB

Reputation: 222432

You seem to want a scalar UDF that wraps the conversion code.

In Redshift, you could write this as:

create function ms_epoch_to_ts(int)
    returns timestamp
    immutable
as $$
    select timestamp 'epoch' + $1 / 1000 * interval '1 second'
$$ language sql;

Upvotes: 2

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