Question

Select Max Number in MS SQL

Asked by: lbarnett419

Need to count, then select max number from list of courses. Can count, but don't know  how to select the max number. I get error when I try to combine max function with count.

select 
a.SCHOOLNUM,name "SchlName",a.SECTIONID "ClassSection",isnull(COUNT(b.STULINK),'0')"#Students"
from 
CLS b RIGHT JOIN MST a
ON a.SCHNUM collate database_default=b.SCHNUM collate database_default and a.CLINK=b.CLINK 
join  
SCH d 
ON d.schnum collate database_default=b.SCHNUM collate database_default
where 
a.COURSE in ('05560300','05560400','05560500') and b.STATUS = ' ' 
GROUP by a.SCHOOLNUM,a.SECTIONID,d.name

                                  
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Asked On
2008-12-12 at 09:17:08ID23980172
Tags

MS SQL

Topic

SQL Query Syntax

Participating Experts
2
Points
500
Comments
15

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    Answers

     

    by: jfmadorPosted on 2008-12-12 at 10:29:17ID: 23159690

    Add a nested query to your query, also your isnull statement could return a number or a varchar, then replace '0' by 0



    SELECT SchoolNum, SchlName, ClassSection, Max(NumStudents) as NumStudents
FROM
(
select 
a.SCHOOLNUM,name SchlName,a.SECTIONID ClassSection,COALESCE(COUNT(b.STULINK),0) numStudents
from 
CLS b RIGHT JOIN MST a
ON a.SCHNUM collate database_default=b.SCHNUM collate database_default and a.CLINK=b.CLINK 
join  
SCH d 
ON d.schnum collate database_default=b.SCHNUM collate database_default
where 
a.COURSE in ('05560300','05560400','05560500') and b.STATUS = ' ' 
GROUP by a.SCHOOLNUM,a.SECTIONID,d.name
) T
GROUP BY SchoolNum, SchlName, ClassSection

                                              
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    by: lbarnett419Posted on 2008-12-12 at 11:19:57ID: 23160123

    Oops, my mistake! It does what you coded, but I need to extract the course that has the highest number of students. Thank you so far!

     

    by: Sharath_123Posted on 2008-12-12 at 11:25:03ID: 23160183

    Author - For exapmple if your query returns data like below:
    SCHOOLNUM SchlName ClassSection #Students
    1         abc      1            10
    1         abc      2            20
    1         abc      3            30
    1         bcd      1            15
    1         bcd      2            40
    2         abc      1            12
    2         abc      2            22
    2         bcd      2            40

    Then tell me whats the output your expecting.

     

    by: lbarnett419Posted on 2008-12-12 at 11:33:33ID: 23160266

    I need to see the largest class size no matter how many classes have the same number. The SCHOOLNUM/Name is unique, so I changed the second bcd to xyz, reflecting different schoolname.

    SCHOOLNUM SchlName ClassSection #Students
    1                    bcd                2                   40
    2                    xyz                2                   40

     

    by: Sharath_123Posted on 2008-12-12 at 11:39:15ID: 23160320

    whats the sql version you are working?

     

    by: lbarnett419Posted on 2008-12-12 at 11:41:34ID: 23160341

    MS SQL 2000

     

    by: Sharath_123Posted on 2008-12-12 at 12:02:36ID: 23160539

    This is pretty simple using CTE and ROW_NUMBER function in SQL 2005 and 2008. I am not sure whether 2000 supports ROW_NUMBER. We can replace the CTE with temp tables but need to look for alternate on ROW_NUMBER if 2000 doesn't support it.

    with ctetable as (
select 
a.SCHOOLNUM,name SchlName,a.SECTIONID ClassSection,isnull(COUNT(b.STULINK),'0')numStudents
from 
CLS b RIGHT JOIN MST a
ON a.SCHNUM collate database_default=b.SCHNUM collate database_default and a.CLINK=b.CLINK 
join  
SCH d 
ON d.schnum collate database_default=b.SCHNUM collate database_default
where 
a.COURSE in ('05560300','05560400','05560500') and b.STATUS = ' ' 
GROUP by a.SCHOOLNUM,a.SECTIONID,d.name
)
 
with ctetable2 as (
select SCHOOLNUM,SchlName,ClassSection,numStudents,
       row_number() over (partition by a.SCHOOLNUM order by numStudents desc) as rownum 
  from ctetable
 
select SCHOOLNUM,SchlName,ClassSection,numStudents from ctetable2 where rownum = 1

                                              
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    by: Sharath_123Posted on 2008-12-12 at 12:04:41ID: 23160557

    replace the cte with temp tables

    select 
a.SCHOOLNUM,name SchlName,a.SECTIONID ClassSection,isnull(COUNT(b.STULINK),'0')numStudents
into #ctetable
from 
CLS b RIGHT JOIN MST a
ON a.SCHNUM collate database_default=b.SCHNUM collate database_default and a.CLINK=b.CLINK 
join  
SCH d 
ON d.schnum collate database_default=b.SCHNUM collate database_default
where 
a.COURSE in ('05560300','05560400','05560500') and b.STATUS = ' ' 
GROUP by a.SCHOOLNUM,a.SECTIONID,d.name
 
 
select SCHOOLNUM,SchlName,ClassSection,numStudents,
       row_number() over (partition by a.SCHOOLNUM order by numStudents desc) as rownum 
  into #ctetable2
  from ctetable
 
select SCHOOLNUM,SchlName,ClassSection,numStudents from #ctetable2 where rownum = 1

                                              
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    by: lbarnett419Posted on 2008-12-12 at 12:43:48ID: 23160874

    no, row_number is not recognized.

     

    by: Sharath_123Posted on 2008-12-12 at 13:05:58ID: 23161054

    replace row_number with  DENSE_RANK and check whether it supports?

     

    by: lbarnett419Posted on 2008-12-15 at 05:11:10ID: 23172942

    No, it doesn't

     

    by: lbarnett419Posted on 2008-12-15 at 05:54:33ID: 23173272

    I came up with something that seems to work. I ran the query that put the data into ctetable. Couldn't find anything that would work with row_number or rank. See if the code makes sense

    select DISTINCT a.SCHOOLNUM ,name SchlName,max(numStudents)LargestClassSize 
from 
ctetable a join
SCHOOL d 
ON d.schoolnum collate database_default=a.SCHOOLNUM collate database_default 
group by a.SCHOOLNUM,name 
order by a.SCHOOLNUM,name ,max(NumStudents)desc

                                              
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    by: Sharath_123Posted on 2008-12-15 at 12:19:11ID: 23177331

    in my ctetable, i used row_number. that is the tricky part in my code. as 2000 doesn't support row_number, we need to find the alternate. wll dig into this when i get some time.

     

    by: lbarnett419Posted on 2008-12-16 at 09:19:38ID: 23185636

    Thank you!

     

    by: lbarnett419Posted on 2009-02-09 at 04:25:18ID: 31525460

    Thank you for your assistance.

    20120131-EE-VQP-002

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