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09.25.2008 at 02:54PM PDT, ID: 23764451
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9.0

Help me make a SQL Query work properly

Asked by HelderConde in SQL Query Syntax, SQL Server 2005, SQL Server 2008

Tags: , ,

Dear colleagues,

I have two queries (shown below) that have different results and I simply cannot understand why that's happening. Perhaps a brighter brain can shed some light into this.

What I want to do is to make a query that will show me all Names from the Users table, which are *not* on the DeletedUsers table. Pretty simple, huh?

Let's say I have 1000 names on the Users table and I have 100 names on the DeletedUsers table.


/* QUERY 1 - USING LEFT OUTER JOIN */
SELECT DISTINCT Users.Name
FROM Users
      LEFT OUTER JOIN DeletedUsers
            On Users.Name <> DeletedUsers.Name



/* QUERY 2 - USING "NOT IN" */
SELECT DISTINCT Users.Name
FROM Users
WHERE Users.Name
NOT IN (SELECT DISTINCT DeletedUsers.Name FROM DeletedUsers)



In theory, both queries should return 900 names, right? However, for some reason, query 1 (the one with Left outer join) returns all 1000 names.

Could this be due to the fact that I'm using a "<>" at the "On" clause? Does JOIN clauses require "="? As a matter of fact, using either "<>" or "=" will provide the very same results...

I'm using SQL 2005 Standard.

Could someone help me get this figured out? Thanks in advance,

Helder CondeStart Free Trial
[+][-]09.25.2008 at 03:07PM PDT, ID: 22574381

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[+][-]09.25.2008 at 03:17PM PDT, ID: 22574459

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[+][-]09.25.2008 at 03:20PM PDT, ID: 22574474

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[+][-]09.25.2008 at 03:22PM PDT, ID: 22574495

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[+][-]09.25.2008 at 03:33PM PDT, ID: 22574603

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[+][-]09.25.2008 at 03:45PM PDT, ID: 22574744

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[+][-]09.25.2008 at 03:50PM PDT, ID: 22574781

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[+][-]09.25.2008 at 03:52PM PDT, ID: 22574792

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About this solution

Zones: SQL Query Syntax, SQL Server 2005, SQL Server 2008
Tags: Microsoft, SQL Server, 2005
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Solution Provided By: 3abqari
Participating Experts: 3
Solution Grade: A
 
 
[+][-]09.25.2008 at 04:58PM PDT, ID: 22575151

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[+][-]09.25.2008 at 07:54PM PDT, ID: 22576226

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[+][-]09.26.2008 at 02:53AM PDT, ID: 22577919

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