How to remove Nulls in a column?

Question

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SQL-Server-2008

Hi I am new to SQL Server 2008 r2
Actually, I have a table like this

SQL

STUDENTID STUDENTSUBJECT        YEAR1           MARKS1 RANK1     YEAR2                 MARKS2 
1          MATHS       2013-06-07-2014-04-05    10    DGRADE     NULL                   NULL     
1          BPC            NULL                 NUll   NULL    2012-06-11-2013-05-14      6


RANK2 YEAR3 MARKS3  RANK3
null   null  null    null
DGRADE null   null   null

i worte a query like this

SQL

SELECT max(STUDENTID)as STUDENTID,MAX(STUDENTSUBJECT )AS STUDENTSUBJECT ,MAX(YEAR1),MAX(MARKS1),MAX(RANK1),MAX(YAER2),MAX(MARKS2),MAX(RANK2),MAX(YEAR3),MAX(MARKS3),MAX(RANK3) FROM STUDENT  GROUP BY STUDENTSUBJECT

This above query is working for SAME SUBJECT like (MATHS,MATHS, etc.) but it is not working for diff subjects like above table I mention.
please help me

excepted o/p:
o/p:

SQL

STUDENTID STUDENTSUBJECT        YEAR1        MARKS1 RANK1    YEAR2               MARKS2 
1          MATHS       2013-06-07-2014-04-05  10    DGRADE  2012-06-11-2013-05-14 null
1          BPC            NULL               NUll    NULL    null                  6
 

RANK2 YEAR3 MARKS3  RANK3
null  null  null    null
DGrade null   null   nul

i have to get all in first row in a table like above one

Posted 25-Sep-13 1:33am

Member 9846414

Updated 25-Sep-13 5:44am

v4

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Comments

ArunRajendra 25-Sep-13 7:40am

what's the output you are expecting?

Member 9846414 25-Sep-13 11:29am

o/p:
STUDENTID STUDENTSUBJECT YEAR1 MARKS1 RANK1 YEAR2 MARKS2
1 MATHS 2013-06-07-2014-04-05 10 DGRADE 2012-06-11-2013-05-14 6
1 BPC NULL NUll NULL null

RANK2 YEAR3 MARKS3 RANK3
DGRADE null null null
null null null null

[no name] 25-Sep-13 7:44am

You write a WHERE clause

Madhu Nair 25-Sep-13 7:46am

why are you taking MAX(STUDENTSUBJECT)? Try Removing this from the query and see if you are getting the desired output

coded007 25-Sep-13 7:46am

use "StudentSubject" instead of "Max(StudentSubject)" query will work

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Mike Meinz · Answer 1 · 2013-09-25T01:58:00

Use the ISNULL() built-in function.

SQL

SELECT 
MAX(STUDENTID) AS STUDENTID,
MAX(STUDENTSUBJECT) AS STUDENTSUBJECT,
ISNULL(MAX(YEAR1),"") As Year1,
ISNULL(MAX(MARKS1),"") As Marks1,
ISNULL(MAX(RANK1),"") As Rank1,
ISNULL(MAX(YEAR2),"") As Year2,
ISNULL(MAX(MARKS2),"") As Marks2,
ISNULL(MAX(RANK2),"") As Rank2,
ISNULL(MAX(YEAR3),"") As Year3,
ISNULL(MAX(MARKS3),"") As Marks3,
ISNULL(MAX(RANK3),"") As Rank3
FROM STUDENT
GROUP BY STUDENTSUBJECT

I do not understand why you use MAX(StudentID) and MAX(StudentSubject). Maybe you should use "Improve Question" and explain exactly what you are trying to get as a result (the requirements statement in simple terms).

VeeraAnnapureddy · Answer 2 · 2013-09-25T20:11:00

SELECT	STUDENTID 
,	STUDENTSUBJECT
,	ISNULL(YEAR1,'')	AS 'YEAR1'
,	ISNULL(MARKS1,'')	AS 'MARKS1'
,	ISNULL(RANK1,'')	AS 'RANK1'
,	ISNULL((Select MAX(Year2) FROM Table26),'') AS 'YEAR2'
,	ISNULL(MARKS2,'')	AS 'MARKS2'
,	ISNULL(RANK2,'')	AS 'RANK2'
,	ISNULL(YEAR3,'')	AS 'YEAR3'
,	ISNULL(MARKS3,'')	AS 'MARKS3'
,	ISNULL(RANK3,'')	AS 'RANK3'
	INTO #TableName
	FROM Table26 

	UPDATE #TableName
	SET YEAR2 = '' 
	WHERE STUDENTSUBJECT = 'BPC'

How to remove Nulls in a column?

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