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select records in one table not found in another?

Posted on 2013-06-04
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Last Modified: 2013-06-04
dbo.postalcodes
dbo.populations

i want to select all postalcodes.CityName and postalcodes.ProvinceAbbr in dbo.postalcodes
that are not found as identical match in populations.City and populations.State

thanks!!
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Question by:arthurh88
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3 Comments
 
LVL 25

Accepted Solution

by:
chaau earned 500 total points
ID: 39221226
Select postalcodes.CityName, postalcodes.ProvinceAbbr
FROM postalcodes LEFT JOIN populations
ON postalcodes.CityName = populations.City AND postalcodes.ProvinceAbbr = populations.State
WHERE populations.City IS NULL AND populations.State IS NULL

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LVL 41

Expert Comment

by:Sharath
ID: 39221236
You can also try this.
select *
  from postalcodes pc
 where not exists (select 1 
                     from populations p 
					where pc.CityName = p.CityName 
					  and pc.ProvinceAbbr  = p.ProvinceAbbr)

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Author Closing Comment

by:arthurh88
ID: 39221247
thanks!!
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