volatile table as select..with data - not loading data - response (17) by MBSconnection

I tried creating a table that didn't work, then I try updating a Table that didn't work. Teradata VS Oracle very different.
Please some help as I am lost No Syntax is working.

UPDATE temp1
SET temp1.Q1Count = temp2.Q1Count
FROM temp1
    INNER JOIN
            (
                SELECT CAST(RP.REGIS_DATETM AS DATE) AS MyDate, 
						COUNT(DISTINCT RP.REGIS_PRSNA_ID) AS Q1Count 
				FROM
						iCRM_LOAD.REGIS_PRSNA RP
						INNER JOIN iCRM.MKTNG_PGM MP
							ON RP.MKTNG_PGM_NBR = MP.MKTNG_PGM_NBR
						INNER JOIN iCRM.REGIS_PRSNA_EMAIL_ADDR RPE
							ON RP.REGIS_PRSNA_ID = RPE.REGIS_PRSNA_ID
								AND RP.MKTNG_PGM_NBR = RPE.MKTNG_PGM_NBR
				WHERE
						RP.MKTNG_PGM_NBR IN (115)
						AND RPE.SUBSCRPTN_OPT_IND = 'I'
						AND RP.PRSNA_STATUS_CODE = 'AC' 
						AND RP.REGIS_DATETM BETWEEN (CURRENT_DATE -7) and CURRENT_DATE                            
				GROUP BY CAST (RP.REGIS_DATETM AS DATE)
            ) temp2
            
 
		ON temp1.MyDate = temp2.MyDate;

What is wrong with this SYNTAX? UPDATE Failed 3706: Syntax error:
Expected something between the word 'Q1Count' and the 'FROM' keyword.
Please help.
MSB