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https://issues.apache.org/jira/browse/DERBY-7051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16906776#comment-16906776
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JackLi0812 commented on DERBY-7051:
-----------------------------------
Hi, Rick:
Let's say I have a table with a purchase history that contains the users
column and the items column, and I want to know the total number of users and
the total number of items that I bought, so I need
{code:java}
SELECT count(DISTINCT user) as userCount, count(DISTINCT product) as
productCount
FROM tableName;{code}
Such a query.
> 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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