IBM Informix-SQL syntax error, basic query from Microsoft BIDS to Cisco UCCX database

问题

I'm running the below query against an IBM Informix database and getting an ERROR 42000: A syntax error has occurred. The FROM and WHERE clauses run fine in other queries, so I'm looking at the SELECT and GROUP BY portions. Any ideas what's wrong with the syntax?

SELECT COUNT(DISTINCT "informix".agentconnectiondetail.sessionid) AS calls_abandoned, 
DAY("informix".agentconnectiondetail.startdatetime) AS Expr2

FROM         "informix".agentconnectiondetail, "informix".contactqueuedetail, "informix".contactservicequeue

WHERE     "informix".agentconnectiondetail.sessionid = "informix".contactqueuedetail.sessionid AND 
                      "informix".contactqueuedetail.targetid = "informix".contactservicequeue.recordid AND "informix".contactqueuedetail.disposition = 1 AND 
                      "informix".agentconnectiondetail.startdatetime BETWEEN '2016-10-1 00:00:00' AND CURRENT

GROUP BY DAY("informix".agentconnectiondetail.startdatetime)

The goal btw is to find the total number of unique calls (calls_abandoned) that occur on each day of the month (1-31).

回答1:

Replace the

GROUP BY DAY("informix".agentconnectiondetail.startdatetime)

by

GROUP BY 2

来源：https://stackoverflow.com/questions/40730419/ibm-informix-sql-syntax-error-basic-query-from-microsoft-bids-to-cisco-uccx-dat