Fox Pro Error on getting values using MAX(date) - php

Question

I'm in a bind with a deadline and I cannot seem to figure this out.
I am trying to query the table to get the values for the corresponding max shipdate. My query is below. This is for Fox Pro using an ODBC driver.
SELECT
so1.sono,
so1.custno,
so1.item,
so1.shipdate as last_shipdate,
so1.price as last_price
FROM sotran01 so1
INNER JOIN (
SELECT
custno,
item,
MAX(shipdate) as last_shipdate
FROM sotran01
WHERE shipdate >= {d'2013-05-23'}
AND shipdate <= {d'2014-05-23'}
GROUP BY custno, item
) so2 ON (so1.custno = so2.custno AND so1.item = so2.item AND so1.shipdate = so2.last_shipdate)
WHERE so1.item IN (
SELECT item
FROM arpric01
)
ORDER BY so1.custno, so1.item, so1.shipdate
This is what I get (using ADOdb):
ADODB_vfp Object
(
[databaseType] => vfp
[fmtDate] => {^Y-m-d}
[fmtTimeStamp] => {^Y-m-d, h:i:sA}
[replaceQuote] => '+chr(39)+'
[true] => .T.
[false] => .F.
[hasTop] => top
[_bindInputArray] =>
[sysTimeStamp] => datetime()
[sysDate] => date()
[ansiOuter] => 1
[hasTransactions] =>
[curmode] =>
[dataProvider] => odbc
[hasAffectedRows] => 1
[binmode] => 1
[useFetchArray] =>
[_genSeqSQL] => create table %s (id integer)
[_autocommit] => 1
[_haserrorfunctions] => 1
[_has_stupid_odbc_fetch_api_change] => 1
[_lastAffectedRows] => 0
[uCaseTables] => 1
[_dropSeqSQL] => drop table %s
[database] =>
[host] => DRIVER={Microsoft Visual FoxPro Driver};SOURCETYPE=dbf;SOURCEDB=C:\Sites\hub.fieldfresh.dev\_cache\VP10\PRAXIS\;EXCLUSIVE=NO;
[user] =>
[password] =>
[debug] =>
[maxblobsize] => 262144
[concat_operator] => +
[substr] => substr
[length] => length
[random] => rand()
[upperCase] => upper
[nameQuote] => "
[charSet] =>
[metaDatabasesSQL] =>
[metaTablesSQL] =>
[uniqueOrderBy] =>
[emptyDate] =>
[emptyTimeStamp] =>
[lastInsID] =>
[hasInsertID] =>
[hasLimit] =>
[readOnly] =>
[hasMoveFirst] =>
[hasGenID] =>
[genID] => 0
[raiseErrorFn] =>
[isoDates] =>
[cacheSecs] => 3600
[memCache] =>
[memCacheHost] =>
[memCachePort] => 11211
[memCacheCompress] =>
[sysUTimeStamp] =>
[arrayClass] => ADORecordSet_array
[noNullStrings] =>
[numCacheHits] => 0
[numCacheMisses] => 0
[pageExecuteCountRows] => 1
[uniqueSort] =>
[leftOuter] =>
[rightOuter] =>
[autoRollback] =>
[poorAffectedRows] =>
[fnExecute] =>
[fnCacheExecute] =>
[blobEncodeType] =>
[rsPrefix] => ADORecordSet_
[autoCommit] => 1
[transOff] => 0
[transCnt] => 0
[fetchMode] => 2
[null2null] => null
[bulkBind] =>
[_oldRaiseFn] =>
[_transOK] =>
[_connectionID] => Resource id #8
[_errorMsg] => [Microsoft][ODBC Visual FoxPro Driver]Syntax error.
[_errorCode] => 37000
[_queryID] =>
[_isPersistentConnection] =>
[_evalAll] =>
[_affected] =>
[_logsql] =>
[_transmode] =>
[_error] =>
)
The error doesn't say much. I can copy and paste the code into MySQL and it runs fine and returns what I expect. Hopefully another set of eyes, with more Fox Pro experience, can see what the issue is here.
Thanks for any assistance.

Answer 1

Your subquery is incorrect. This is the subquery:
INNER JOIN (
SELECT custno, item, MAX(shipdate) as last_shipdate
FROM sotran01
WHERE shipdate >= {d'2013-05-23'}
AND shipdate <= {d'2014-05-23'}
GROUP BY custno, item, last_shipdate
-------------------------------^
)
That is an aggregation column. Remove it:
INNER JOIN (
SELECT custno, item, MAX(shipdate) as last_shipdate
FROM sotran01
WHERE shipdate >= {d'2013-05-23'}
AND shipdate <= {d'2014-05-23'}
GROUP BY custno, item
)