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How to add column header in unload command of Redshift in Python?


By : Yousef Bani Naser
Date : October 14 2020, 08:10 PM
it helps some times UNLOAD has a HEADER option, which solves your problem, and you can even leave out the PARALLEL OFF part. It simplifies your code a lot:
code :
sql="""UNLOAD (\'SELECT ups_tracking_nbr
        FROM Schema.Table
        WHERE TRUNC(last_order_updated_dttm) > TRUNC(SYSDATE - 30))
        ORDER BY rn\')
        TO 's3://abc/ups/EXTRACT_FOR_file' \
        credentials 'aws_iam_role=arn:aws:iam::xyz' \
        ALLOWOVERWRITE \
        DELIMITER  ',' \
        HEADER;Commit;"""
SELECT 'foo' as return, 1 as rn
UNION ALL 
SELECT ups_tracking_nbr, 2 AS rn
...


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Does UNLOAD command removes or deletes data from redshift?


By : lancelot
Date : March 29 2020, 07:55 AM
wish of those help Unload does not delete or remove data from the original table. See the explicit truncate in the COPY reload example

Incorrect output when exporting AWS Redshift data to S3 using UNLOAD command


By : sarmenhbbb
Date : March 29 2020, 07:55 AM
around this issue Instead of doing a SELECT * FROM DATE, you can specify the column names and there you can customize how you want the data to be exported, by using CASE IF ELSE conditions.
code :
SELECT dateid,caldate,day,week,CASE WHEN holiday = true THEN \'TRUE\' ELSE \'FALSE\' END AS holiday from date;

how to create redshift unload header row


By : user351342
Date : March 29 2020, 07:55 AM
Does that help Good news! As of Oct 2 2018, Redshift started to roll out support for HEADER option in the UNLOAD command which will export the column titles as the header of your csv.
Here is their announcement: https://forums.aws.amazon.com/ann.jspa?annID=6136
code :
UNLOAD ('SELECT * FROM customers')
TO 's3://<bucket-name>/customers.csv'
CREDENTIALS 'aws_iam_role=arn:aws:iam::<IAM_USER_ID#>:role/myRedshiftRole'
PARALLEL OFF DELIMITER ',' HEADER;

Why does Redshift UNLOAD query is not able to quote column correctly?


By : user2800098
Date : March 29 2020, 07:55 AM
Any of those help Amazon support was able to resolve this, I am posting answer here for anyone interested.
This was due to presence of NULL character \0 in my data. As I don't have control over source data, I used TRANSLATE function to replace \0 character.
code :
SELECT
TRANSLATE("name", CHR(0), '') AS "name"
FROM <tablename>

How to handle quoted values in AWS Redshift unload command?


By : Karlissa Ablay
Date : March 29 2020, 07:55 AM
hope this fix your issue From UNLOAD - Amazon Redshift:
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