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not null column count (merged 2) [message #317276] Wed, 30 April 2008 05:58 Go to next message
saiphani723
Messages: 36
Registered: July 2006
Location: Hyderabad
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can anybody tell how to count a NOT NULL columns in a table for each row.

Re: NOT NULL columns count [message #317282 is a reply to message #317276] Wed, 30 April 2008 06:27 Go to previous messageGo to next message
Michel Cadot
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This is NOT an expert question.

It is clearly stated in the forum description: "Newbies should not post to this forum!"
Expert notion is defined in the sticky: Not an EXPERT? Post in the NEWBIES forum, NOT here
Rules are described in: OraFAQ Forum Guide
Read them, follow them including what is said about formatting.

As you are an expert, I don't answer the question because you obviously already knows it.

Regards
Michel
Re: NOT NULL columns count [message #317287 is a reply to message #317276] Wed, 30 April 2008 06:31 Go to previous messageGo to next message
Michel Cadot
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Use COUNT.

Regards
Michel
Re: NOT NULL columns count [message #317290 is a reply to message #317276] Wed, 30 April 2008 06:38 Go to previous messageGo to next message
saiphani723
Messages: 36
Registered: July 2006
Location: Hyderabad
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Dear Michel,

using COUNT we can know how not null values for particular column.

i will explain my scenario


./fa/4207/0/
  • Attachment: scenario.jpg
    (Size: 31.58KB, Downloaded 231 times)
Re: NOT NULL columns count [message #317299 is a reply to message #317290] Wed, 30 April 2008 07:00 Go to previous messageGo to next message
Michel Cadot
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Use COUNT and CASE/DECODE/NVL2

Regards
Michel
Re: NOT NULL columns count [message #317337 is a reply to message #317299] Wed, 30 April 2008 11:43 Go to previous messageGo to next message
saiphani723
Messages: 36
Registered: July 2006
Location: Hyderabad
Member
using COUNT and DECODE/CASE/NVL2 i am not getting

can u pls tell me how to proceed.
Re: NOT NULL columns count [message #317338 is a reply to message #317337] Wed, 30 April 2008 12:16 Go to previous messageGo to next message
Michel Cadot
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Post what you tried.

Regards
Michel
Re: NOT NULL columns count [message #317341 is a reply to message #317338] Wed, 30 April 2008 14:08 Go to previous messageGo to next message
saiphani723
Messages: 36
Registered: July 2006
Location: Hyderabad
Member
i tried in the following way

my screen capturing is not working. becuase of that i copied and paste hee

SQL> select nvl2(empno,1,0)+nvl2(ename,1,0)+nvl2(job,1,0)+nvl2(sal,1,0)+nvl2(comm,1,0)+nvl2(deptno,1
,0) from emp;

NVL2(EMPNO,1,0)+NVL2(ENAME,1,0)+NVL2(JOB,1,0)+NVL2(SAL,1,0)+NVL2(COMM,1,0)+NVL2(DEPTNO,1,0)
-------------------------------------------------------------------------------------------
5
6
6
5
6
5
5
5
5
6
5
5
5
5

14 rows selected.
Re: NOT NULL columns count [message #317342 is a reply to message #317341] Wed, 30 April 2008 14:11 Go to previous messageGo to next message
Michel Cadot
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And is this not the correct result?

Regards
Michel
Re: NOT NULL columns count [message #317344 is a reply to message #317342] Wed, 30 April 2008 14:15 Go to previous messageGo to next message
saiphani723
Messages: 36
Registered: July 2006
Location: Hyderabad
Member
Result is correct. but i think that is not the correct way of doing. For some columns it is ok. If there are more than 50 columns in that case i think it is bit difficult.
Re: NOT NULL columns count [message #317347 is a reply to message #317344] Wed, 30 April 2008 14:59 Go to previous message
Michel Cadot
Messages: 64103
Registered: March 2007
Location: Nanterre, France, http://...
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This is the fastest way.
You can find more complex ones but there are not slower and will not let you type less characters.

Regards
Michel
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