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How to write WHERE clause for a date range when using separate columns for year and month

Posted on 2011-03-11
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Last Modified: 2012-05-11
How do I write the WHERE clause to include a date range or period range when I have a column for the year and a column for the month

I have a SQL table with 3 columns - Year, Month, Amount

Typical rows are:
Year   Month   Amount
2009,    1,       $12
2009,    3,       $15
2009,    12,     $30
2010,    2,       $10
2010,   12,      $67

I would like to query for     2009 / 3 thru  2010 / 3

So the 2,3,4 row would be included and the first and last row not included in query

I'm using SQL 2008 and  ColdFusion9



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Question by:bigmikey88
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12 Comments
 
LVL 24

Expert Comment

by:jimyX
ID: 35112199
Select * from Table where (Year >= 2009 and month >= 3 and Year <= 2010 and month <= 3)
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Assisted Solution

by:dba2dba
dba2dba earned 150 total points
ID: 35112216
select * from table
where
((year=2009) AND (month>=3 and month<=12))
and
((year=2010) AND (month>=1 and month<=3))
0
 
LVL 39

Accepted Solution

by:
gdemaria earned 350 total points
ID: 35112261
i think the proposed solutions need an OR...

> Select * from Table where (Year >= 2009 and month >= 3 and Year <= 2010 and month <= 3)

Seem this will only return March in 2009 or 2010

I think this one needs and OR, otherwise nothing will match as the year can't be 2009 AND 2010...
select * from table
where ((year=2009) AND (month>=3 and month<=12))
and    ((year=2010) AND (month>=1 and month<=3))


select * from table
where (
  (year=2009 AND (month>=3 and month<=12) )
OR 
  (year=2010 AND (month>=1 and month<=3) ) 
)

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LVL 24

Expert Comment

by:jimyX
ID: 35112289
Mine needs parentheses:
Select * from Table where (Year >= 2009 and month >= 3) and (Year <= 2010 and month <= 3)
0
 
LVL 8

Expert Comment

by:dba2dba
ID: 35112302
Yes gdemaria: is correct. The AND in the where clause needs to be OR.

THanks,
0
 

Expert Comment

by:etanox
ID: 35112303
select * from table where
(year=2009 and month>=3)
or
(year=2010 and month<=3)
0
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LVL 39

Expert Comment

by:gdemaria
ID: 35112331

> Mine needs parentheses:

Parentheses don't matter when you have all "and" s..


> Select * from Table where (Year >= 2009 and month >= 3) and (Year <= 2010 and month <= 3)

Try testing Month= 7 in year 2009 it will not match because of month <= 3 at the end which is ANDed

0
 
LVL 39

Expert Comment

by:gdemaria
ID: 35112343
etanox is right, you don't need to specify <= 12 or >=1 as there are no months greater than 12 or less than 1.


0
 
LVL 24

Expert Comment

by:jimyX
ID: 35112497
You are right.
0
 

Author Closing Comment

by:bigmikey88
ID: 35112559
<cfquery name="GetEarnings" datasource="mydb" username="#User#" password="#Pass#" dbtype="ODBC">
SELECT  Period_Year, Period_Month, Amount AS Earnings
FROM   mytable
Where
(
(Period_Year = #StartYear# AND (Period_Month >= #StartMonth# AND Period_Month <= 12)) OR

((Period_Year < #EndYear# AND Period_Year <> #StartYear#) AND (Period_Month >= 1 AND Period_Month <= 12)) OR

 (Period_Year = #EndYear# AND (Period_Month >= 1 AND Period_Month <= #EndMonth#))
 )
Order By Period_Year, Period_Month
</cfquery>

The ideas from gdemaria and dba2dba pointd me in the right direction and gdemaria's comments about needing the OR were correct.

Since the years and months are dynamic, and can span several years, I had to have another OR clause.  It seems to be working.  But I need to test it more.

Thx all
0
 

Author Comment

by:bigmikey88
ID: 35112596
Well, after further testing the code I wrote did not work well.

I'm going to take another approach.

Mike
0
 
LVL 39

Expert Comment

by:gdemaria
ID: 35112620
this is a modified version of what you wrote..
SELECT  Period_Year, Period_Month, Amount AS Earnings
FROM   mytable
Where 
(
   (Period_Year = #StartYear# AND Period_Month >= #StartMonth#)
OR
   (Period_Year > #StartYear# AND Period_Year < #EndYear#)
OR
   (Period_Year = #EndYear# AND Period_Month <= #EndMonth#)
 )
Order By Period_Year, Period_Month

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