Suppose, following the AWS docs I'd like to use an unload command like
unload
(
'SELECT *
FROM table_name
WHERE day = '2019-01-01'
')
to 's3://bucket_name/path'
iam_role 'arn:aws:iam::<aws acct num>:role/<redshift role>'
ADDQUOTES
ESCAPE
DELIMITER ','
GZIP
ALLOWOVERWRITE;
The problem is that the full query should be quoted and to write a string literal into the query will escape the string before the full query (as valid sql) is finished. How to escape quotes inside an AWS redshift unload statement?
Full disclosure, I know one way to do this but haven't seen a good link or SO question so figured I'd post one for others benefit.
From UNLOAD - Amazon Redshift :
If your query contains quotes (for example to enclose literal values), put the literal between two sets of single quotation marks—you must also enclose the query between single quotation marks:
('select * from venue where venuestate=''NV''')
You can put the query between $$ symbols so that you don't have to worry about any kind of quotes
unload
(
$$SELECT *
FROM table_name
WHERE day = '2019-01-01'
$$)
to 's3://bucket_name/path'
iam_role 'arn:aws:iam::<aws acct num>:role/<redshift role>'
ADDQUOTES
ESCAPE
DELIMITER ','
GZIP
ALLOWOVERWRITE;
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