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How to use multiple AND clauses together

Posted on 2011-09-13
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Last Modified: 2012-06-21
I am trying to use multiple and clauses together. I am not getting the desired results only the first and clause seems to run .

I would like ths statement to output data;

when bnum is greater than or  equal to 0.700 and br_name is >= 1 and/or  when m_num <= equal to 0.700 and/or br_name is >= 1, output  data when d_num is greater than or equal to 0.700 and/or br_name is >= 1 output  data.



select * 
from tmp_table
where 
     b_num <= 0.700 AND br_num >= 1
AND   m_num <= 0.700 AND br_num >= 1
AND   d_num <= 0.700 AND br_num >= 1
ORDER BY name;

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Question by:DAN2011
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6 Comments
 
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Assisted Solution

by:johanntagle
johanntagle earned 400 total points
ID: 36532687
Based on your description your where clause should be:

where (b_num <= 0.700 AND br_num >= 1)  /* because you said "bnum is greater than or  equal to 0.700 AND br_name is >= 1"*/
OR br_num >= 1
OR m_num <= 0.700
OR d_num <= 0.700
/*then for the rest you said "AND/OR", which translates to an OR*/

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Please clarify.  Thanks.
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Author Comment

by:DAN2011
ID: 36532778
I know its confusing. I am trying to check to see if all three conditions exist. For example in plain english if

b_num is greater than or equal to 7 and br_num is greater than 1 output this data,  if d_num is also greater than or equal to 7 and br_num is greater than 1 output this data as well and if m_num is greater than or equal to 7 and br_num is greater than 1 output this data.
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LVL 72

Expert Comment

by:Qlemo
ID: 36532795
As you are describing it, the main requirement is "br_num >= 1", and any of the other conditions. However, what you described is rather blurry. I would decode it as
select * from tmp_table
where br_num >= 1 and d_num <= 0.700)
   and (b_num <= 0.700 OR m_num <= 0.700)
ORDER BY name;

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LVL 72

Accepted Solution

by:
Qlemo earned 1600 total points
ID: 36532810
After http:#a36532778 you really want to have EITHER condition to apply. That is
select * from tmp_table
where br_num >= 1 
   and (b_num <= 0.700 OR m_num <= 0.700 or d_num <= 0.700)
ORDER BY name;

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0
 

Author Comment

by:DAN2011
ID: 36532939
I think this is more of what I am trying to do, but now the br_num >=1 is not working
select * 
from table
where br_num >= 1 
AND (b_num <= 0.700 OR m_num <= 0.700 OR d_num <= 0.700 OR n_num <= 0.700)
OR (m_num <= 0.700 OR b_num <= 0.700 OR d_num <= 0.700 OR n_num <= 0.700) 
OR (d_num <= 0.700 OR m_num <= 0.700 OR b_num <= 0.700 OR wtd_market_index <= 0.700)
OR (n_num<= 0.700 OR d_num <= 0.700 OR m_num <= 0.700 OR b_num <= 0.700)
ORDER BY name;

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LVL 72

Expert Comment

by:Qlemo
ID: 36532992
(b_num <= 0.700 OR m_num <= 0.700 OR d_num <= 0.700 OR n_num <= 0.700)
OR (m_num <= 0.700 OR b_num <= 0.700 OR d_num <= 0.700 OR n_num <= 0.700) 

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is exactly the same as
(b_num <= 0.700 OR m_num <= 0.700 OR d_num <= 0.700 OR n_num <= 0.700)

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so your conditions do not make sense. In addition, br_num >= 1 needs only to apply for the very first conditional expression, because of the AND; any other condition needs to be true with no respect to br_num, as you wrote it. AND has precedence over OR, so
    a AND b OR c     is in fact   (a AND b) OR C
Because of several algebraic rules (distributive and associative law)
    a OR (b OR c OR d)    is the same as   a OR b OR c OR d
and
   (a AND b) OR (a AND c)   is the same as   a AND (b OR c)

If you think of OR like + and AND like *, common arithmetic applies, and it is easier to transform.
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