Condtion based xml for each row of the table t-sql

Hello ,
i have below data.
create table #students
id int identity(1,1) primary key,
student_id int not null,
[s_m_cml] xml
insert into #students
student_id,
[s_m_xml]
values
101,
'<submarks><submark><subject>Arts</subject><marks>85</marks></submark><submark><subject>Science</subject><marks>95</marks></submark><submark><subject>maths</subject><marks>100</marks></submark></submarks>'
),(102,'<submarks><submark><subject>Arts</subject><marks>50</marks></submark><submark><subject>Science</subject><marks>75</marks></submark><submark><subject>maths</subject><marks>85</marks></submark></submarks>')
select * from #students
if all subjects- marks in s_m_xml marks > 80 then i select the row as promoted else as demoted. the exact output should look like below.
student_id [status]
101 promoted
102 demoted
what is the best way to achieve this using t-sql. Thanks in advance for any suggestions.

You dont need to parse out the values from xml for this
You can do the check inline
see illustration below
drop table #students
create table #students
id int identity(1,1) primary key,
student_id int not null,
[s_m_cml] xml
insert into #students
student_id,
[s_m_cml]
values
101,
'<submarks><submark><subject>Arts</subject><marks>85</marks></submark><submark><subject>Science</subject><marks>95</marks></submark><submark><subject>maths</subject><marks>100</marks></submark></submarks>'
),(102,'<submarks><submark><subject>Arts</subject><marks>50</marks></submark><submark><subject>Science</subject><marks>75</marks></submark><submark><subject>maths</subject><marks>85</marks></submark></submarks>')
,(104,'<submarks><submark><subject>Arts</subject><marks>92</marks></submark><submark><subject>Science</subject><marks>88</marks></submark><submark><subject>maths</subject><marks>98</marks></submark></submarks>')
select *,
case when [s_m_cml].exist('/submarks/submark[data(marks) < 80]')=1 then 'demoted' else 'promoted' end as status
from #students
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Message was edited by:
        Kokwei Wong
Message was edited by:
        Kokwei Wong

Hi Wong,
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Message was edited by:
        Petra

hi
i have a code for drop down list use this
this code is for selection-screen deop-down list yu can add this same code in ALV
REPORT ZCHETANA_PRAC10                         .
Type-pools: VRM.
data: name type vrm_id,
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Edited by: 917391 on 2012-3-21 下午6:53
Edited by: 917391 on 2012-3-21 下午10:07
Edited by: 917391 on 2012-3-21 下午10:16

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Edited by: 917391 on 2012-3-21 下午10:26

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(Code example deleted due to confusion)
Code example deleted due to confusion
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Hi 3360,
I am using PL/SQL. I can make my point without any code.
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