Update using a select statement How to?

Greetings
I have a table of customer records that has a unique customer number.
I have another table that has multiple entries for each customer record number reflecting updates over time.
Each time a change is made a new record is inserted and a change date field is set to the current date.
I want to get the oldest change date inserted into a field in the master Customer table.
I have attempted a number of different queries. i was wondering if someone might be able to point to my failings.
This query gets the value that i want.
select BI_ACCT_CODE, min(bi_date_chng) from gen_bitaccttable group by BI_ACCT_CODE
61638538     29/JUL/04
61638547     29/MAY/04
61638556     30/JUL/04
61638565     29/OCT/11
61638574     29/JUL/05
61638583     29/JUL/89
61638592     29/JUL/05
61638609     29/JUL/06
etc.............
BI_ACCT_CODE is the customer number that exists in both tables.
This is the current state of my query.
update CDM_CUSTOMER
set CUS_REGISTRATIONDATE =( select BI_ACCT_CODE ,min(bi_date_chng) from gen_bitaccttable
group by BI_ACCT_CODE where gen_bitaccttable.BI_ACCT_CODE = CDM_CUSTOMER.CUS_SEQNO);
This complains with the following error.
Error starting at line 147 in command:
update CDM_CUSTOMER set CUS_REGISTRATIONDATE =( select BI_ACCT_CODE, min(bi_date_chng) from gen_bitaccttable group by BI_ACCT_CODE where gen_bitaccttable.BI_ACCT_CODE = CDM_CUSTOMER.CUS_SEQNO)
Error at Command Line:147 Column:118
Error report:
SQL Error: ORA-00907: missing right parenthesis
00907. 00000 - "missing right parenthesis"
*Cause:
*Action:
Thanks

Thanks for responding.
I modified it to:
update CDM_CUSTOMER set CUS_REGISTRATIONDATE =( select min(bi_date_chng) from gen_bitaccttable group by BI_ACCT_CODE where gen_bitaccttable.BI_ACCT_CODE = CDM_CUSTOMER.CUS_SEQNO)
This still gives the error.
Error starting at line 153 in command:
update CDM_CUSTOMER set CUS_REGISTRATIONDATE =( select min(bi_date_chng) from gen_bitaccttable group by BI_ACCT_CODE where gen_bitaccttable.BI_ACCT_CODE = CDM_CUSTOMER.CUS_SEQNO)
Error at Command Line:153 Column:118
Error report:
SQL Error: ORA-00907: missing right parenthesis
00907. 00000 - "missing right parenthesis"
*Cause:
*Action:

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Greetings,
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import java.io.OutputStream;
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Hi,
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... I have an insert query here with a select statement.. Juz wondering how to do it in update?How to do what, exactly?
MERGE can UPDATE existing rows, and INSERT new rows at the same time. In a MERGE statement, you give a table or a sub-query in the USING clause, and define how rows from that result set match rows in your destination table. If rows match, then you can UPDATE the matching row with values from the sub-query.
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SELECT STATEMENT | | | 560299
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HTH, Joze
Co-author of the forthcoming book "Expert Oracle Practices"
http://www.apress.com/book/view/9781430226680
Oracle related blog: http://joze-senegacnik.blogspot.com/
Blog about flying: http://jsenegacnik.blogspot.com/
Blog about Building Ovens, Baking and Cooking: http://senegacnik.blogspot.com

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Wendy Fu
TechNet Community Support

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in the flow logic..
PROCESS BEFORE OUTPUT.
MODULE status_0100.
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PROCESS AFTER INPUT.
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Regards
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     "JE_TRANSACTIONS" "JE_TRANSACTIONS"
where "JOURNAL_ENTRIES"."RELATED_REVREC"="REVREC_FORMS"."REVREC_ID"
and     "JOURNAL_ENTRIES"."RECORD_ID_"="JE_TRANSACTIONS"."RELATED_JOURNAL_ENTRY"
and      "JOURNAL_ENTRIES"."RELEASE_TYPE" ='Release'
and     "JOURNAL_ENTRIES"."REVENUE_TYPE" ='Software'
and     "REVREC_FORMS"."REVREC_ID" =:P12_REVREC_ID
Select Statement #2
select     sum(JE_TRANSACTIONS.DEBIT_AMOUNT) as "Deferral"
from     "REVREC_FORMS" "REVREC_FORMS",
     "JOURNAL_ENTRIES" "JOURNAL_ENTRIES",
     "JE_TRANSACTIONS" "JE_TRANSACTIONS"
where "JOURNAL_ENTRIES"."RELATED_REVREC"="REVREC_FORMS"."REVREC_ID"
and     "JOURNAL_ENTRIES"."RECORD_ID_"="JE_TRANSACTIONS"."RELATED_JOURNAL_ENTRY"
and      "JOURNAL_ENTRIES"."RELEASE_TYPE" ='Deferral'
and     "JOURNAL_ENTRIES"."REVENUE_TYPE" ='Software'
and     "REVREC_FORMS"."REVREC_ID" =:P12_REVREC_ID

How about
select   sum(decode(release_type,'Deferral',je_transactions.debit_amount)) - sum(decode(release_type,'Release',je_transactions.debit_amount)) as result
from   "REVREC_FORMS" "REVREC_FORMS",
"JOURNAL_ENTRIES" "JOURNAL_ENTRIES",
"JE_TRANSACTIONS" "JE_TRANSACTIONS"
where "JOURNAL_ENTRIES"."RELATED_REVREC"="REVREC_FORMS"."REVREC_ID"
and "JOURNAL_ENTRIES"."RECORD_ID_"="JE_TRANSACTIONS"."RELATED_JOURNAL_ENTRY"
and "JOURNAL_ENTRIES"."REVENUE_TYPE" ='Software'
and "REVREC_FORMS"."REVREC_ID" =:P12_REVREC_IDScott

Update using a select statement How to?

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