Error with non-standard identifier in \copy command

All we need is an easy explanation of the problem, so here it is.

Would like to be able to add characters like ‘-‘ in the schema name when running COPY command in PostgreSQL. Any way to get around this?

psql -d postgres -c "\COPY (SELECT * FROM test-schema.tableName) TO data.csv DELIMITER ',' CSV"
ERROR:  syntax error at or near "-"`enter code here`
LINE 1: COPY  ( SELECT * FROM test-schema.tableName ) TO STDOUT DELIMITER ',...

How to solve :

I know you bored from this bug, So we are here to help you! Take a deep breath and look at the explanation of your problem. We have many solutions to this problem, But we recommend you to use the first method because it is tested & true method that will 100% work for you.

Method 1

The error is with the illegal identifiers for schema and table name, and not immediately related to COPY (nor to the psql meta-command \copy, which you actually use). Use double-quotes:

"test-schema"."tableName"

(Assuming you registered the table as "tableName", not as tablename, which would be preferable.)
Since you double-quote the command argument in the shell, too, you need to escape the added double-quotes:

psql -d postgres -c "\copy (SELECT * FROM \"test-schema\".\"tableName\") TO data.csv DELIMITER ',' CSV;"

Or use single-quotes in the shell and dollar-quotes for the string:

psql -d postgres -c '\copy (SELECT * FROM "test-schema"."tableName") TO data.csv DELIMITER $$,$$ CSV;'

You wouldn’t encounter any of these problems with legal, lower-case identifiers, which do not require double-quoting. See:

Note: Use and implement method 1 because this method fully tested our system.
Thank you 🙂

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