Update query with case

my table : workingdate
sno name startdate
1 ss 1-12-2011
2 bb 1-11-2011
I can update name or start date or both .i will pass new date,name to update through front end.
I need to validate the condition in case statement i.e. when the new date passed check whether it is greater then start date. if it is greater then it should update with new start date.
if no then it should be update it will old value.
i using below query
update workingdate set name='sss',startdate=(
case
when
(TO_DATE('2011-12-10','yyyy-MM-dd') > (select TO_DATE(startdate,'yyyy-MM-dd') from workingdate where sno=1))
then TO_DATE('2011-12-10','yyyy-MM-dd')
else
select TO_DATE(start_date,'yyyy-MM-dd') from workingdate where sno=1
end
where sno=1;
but when i execute the above query it shows me
Error report:
SQL Error: ORA-00936: missing expression
00936. 00000 - "missing expression"
*Cause:
*Action:
how could i resolve this.......................

Check this out
UPDATE workingdate
SET NAME='sss',
startdate=(CASE WHEN (TO_DATE('2011-12-10','yyyy-MM-dd') > startdate THEN TO_DATE('2011-12-10','yyyy-MM-dd') ELSE start_date END)
WHERE sno=1;Cheers
Kanchana

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=====CODE==========
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=====ERROR=======
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===========ERROR==========
ORA-06550: line 3, column 29:
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ORA-06550: line 2, column 2:
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ORA-06550: line 4, column 2:
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887268 wrote:
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Please post DDL, so that people do not have to guess what the keys, constraints, Declarative Referential Integrity, data types, etc. in your schema are. Learn how to follow ISO-11179 data element naming conventions and formatting rules. Temporal data should
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--CELKO-- Books in Celko Series for Morgan-Kaufmann Publishing: Analytics and OLAP in SQL / Data and Databases: Concepts in Practice Data / Measurements and Standards in SQL SQL for Smarties / SQL Programming Style / SQL Puzzles and Answers / Thinking
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BANNER
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