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https://issues.apache.org/jira/browse/DERBY-7051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16906182#comment-16906182
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Rick Hillegas commented on DERBY-7051:
--------------------------------------
That is non-Standard syntax. The <set quantifier> (DISTINCT) must appear before
the entire <select list> according to the 2016 SQL Standard, part 2, subclause
7.16 (<query specification>). You cannot use the DISTINCT quantifier to
decorate individual items in the <select list>.
I'm not sure what you are trying to achieve with that query. Maybe the
following workaround will help:
{noformat}
connect 'jdbc:derby:memory:db;create=true';
CREATE TABLE orders (customerID BIGINT, orderID BIGINT);
-- illegal syntax
SELECT DISTINCT(customerID), DISTINCT(orderID) FROM orders;
-- works
SELECT DISTINCT customerID, orderID FROM orders;
{noformat}
> Multiple DISTINCT columns are not supported
> -------------------------------------------
>
> Key: DERBY-7051
> URL: https://issues.apache.org/jira/browse/DERBY-7051
> Project: Derby
> Issue Type: Bug
> Components: JDBC
> Environment: derby-10.11.1.1;
> Reporter: JackLi0812
> Priority: Major
>
>
> {code:java}
> SELECT DISTINCT (ORDERS.CUSTOMER_ID), DISTINCT (ORDERS.ORDER_ID)
> FROM ORDERS
> ORDER BY ORDERS.ORDER_ID
> ;{code}
> throw error:
> {code:java}
> SQL Error [42X01]: Syntax error: Encountered "DISTINCT" at line 1, column 39.
> {code}
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