How to Group By and Order By - SQL Server -


i need group uniqueidentifier column , sort group datetime column, table contains xml column.

table schema: studentmark:

create table [dbo].[studentmark] (     [studentmarkid] [int] identity(1,1) not null,     [studentid] [uniqueidentifier] null,     [subjectid] [uniqueidentifier] null,     [scoreinfo] [xml] null,     [generatedon] [datetime2](2) not null,      constraint [pk_studentmark]         primary key clustered ([studentmarkid] asc) ) on [primary] textimage_on [primary]

sample seed data

insert [dbo].[studentmark] ([studentid], [subjectid], [scoreinfo], generatedon]) values ('fc3cb475-b480-4129-9190-6de880e2d581', '0d72f79e-fb48-4d3e-9906-b78a9d105081', '<studentmarkattribute xmlns:xsd="http://www.w3.org/2001/xmlschema" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"></studentmarkattribute>', '2017-08-10 10:10:15'),        ('0f4ef48c-93e3-41aa-8295-f6b0e8d8c3a2', '0d72f79e-fb48-4d3e-9906-b78a9d105081', '<studentmarkattribute xmlns:xsd="http://www.w3.org/2001/xmlschema" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"></studentmarkattribute>', '2017-08-10 10:10:15'),        ('0f4ef48c-93e3-41aa-8295-f6b0e8d8c3a2', 'ab172272-d2e9-49e1-8040-6117bb6743db', '<studentmarkattribute xmlns:xsd="http://www.w3.org/2001/xmlschema" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"></studentmarkattribute>', '2017-08-16 09:06:20'),        ('fc3cb475-b480-4129-9190-6de880e2d581', 'ab172272-d2e9-49e1-8040-6117bb6743db', '<studentmarkattribute xmlns:xsd="http://www.w3.org/2001/xmlschema" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"></studentmarkattribute>', '2017-08-16 09:06:20');

requirement: need group [dbo].[studentmark].[studentid] , sort column [dbo].[studentmark].[generatedon] within group.

i tried following sql query causing error

select      max([studentmarkid]), [studentid], [subjectid], [scoreinfo], [generatedon]      [dbo].[studentmark]  group      [studentid] order      [generatedon] desc

error:

column 'dbo.studentmark.subjectid' invalid in select list because not contained in either aggregate function or group clause.

expected result set:

3, '0f4ef48c-93e3-41aa-8295-f6b0e8d8c3a2', 'ab172272-d2e9-49e1-8040-6117bb6743db', '<studentmarkattribute xmlns:xsd="http://www.w3.org/2001/xmlschema" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"></studentmarkattribute>', '2017-08-16 09:06:20'  2, '0f4ef48c-93e3-41aa-8295-f6b0e8d8c3a2', '0d72f79e-fb48-4d3e-9906-b78a9d105081', '<studentmarkattribute xmlns:xsd="http://www.w3.org/2001/xmlschema" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"></studentmarkattribute>', '2017-08-10 10:10:15'  4, 'fc3cb475-b480-4129-9190-6de880e2d581', 'ab172272-d2e9-49e1-8040-6117bb6743db', '<studentmarkattribute xmlns:xsd="http://www.w3.org/2001/xmlschema" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"></studentmarkattribute>', '2017-08-16 09:06:20'  1, 'fc3cb475-b480-4129-9190-6de880e2d581', '0d72f79e-fb48-4d3e-9906-b78a9d105081', '<studentmarkattribute xmlns:xsd="http://www.w3.org/2001/xmlschema" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"></studentmarkattribute>', '2017-08-10 10:10:15'

i refereed following question can't fix it: sql group order by

for kind information i'm using sql server 2016.

kindly assist me.

select max([studentmarkid]),      [studentid],      [subjectid],      convert(varchar(max),[scoreinfo]) [scoreinfo] , [generatedon] [dbo].[studentmark]  group [studentid], [subjectid], convert(varchar(max), [scoreinfo]), [generatedon] order [generatedon] desc

check also

select max([studentmarkid])          on (partition [studentid] order [generatedon] desc) maxstudentmarkid,      [studentid],     [subjectid],     convert(varchar(max),[scoreinfo]) [scoreinfo] , [generatedon] [dbo].[studentmark]

output -

maxstudentmarkid    studentid   subjectid   scoreinfo   generatedon 4   fc3cb475-b480-4129-9190-6de880e2d581    ab172272-d2e9-49e1-8040-6117bb6743db    <studentmarkattribute xmlns:xsd="http://www.w3.org/2001/xmlschema" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"/>  2017-08-16 09:06:20.00 4   fc3cb475-b480-4129-9190-6de880e2d581    0d72f79e-fb48-4d3e-9906-b78a9d105081    <studentmarkattribute xmlns:xsd="http://www.w3.org/2001/xmlschema" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"/>  2017-08-10 10:10:15.00 3   0f4ef48c-93e3-41aa-8295-f6b0e8d8c3a2    ab172272-d2e9-49e1-8040-6117bb6743db    <studentmarkattribute xmlns:xsd="http://www.w3.org/2001/xmlschema" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"/>  2017-08-16 09:06:20.00 3   0f4ef48c-93e3-41aa-8295-f6b0e8d8c3a2    0d72f79e-fb48-4d3e-9906-b78a9d105081    <studentmarkattribute xmlns:xsd="http://www.w3.org/2001/xmlschema" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"/>  2017-08-10 10:10:15.00

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