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    <p>The code is parsed before it is run. When it is parsed SQL Server checks that it can access everything in the code, it cannot access the database that exists on the other server so the parsing step of running the code fails. As a result, you get the error message you've shown.</p> <p>If you want to get around that you can put the code in the IF blocks as dynamically executed code (I always feel this is a bit of a hack/workaround).</p> <pre><code>DECLARE @sql NVARCHAR(4000); if ((select @@servername) = 'ServerA') begin SET @sql = 'use DatabaseA; select top 5 * from dbo.SignUPRequest;' end else if ((select @@servername) = 'ServerB') begin SET @sql = 'use DatabaseB; select top 5 * from dbo.SignUPRequest' end EXEC (@sql) </code></pre> <p>So, what happens here is that you defer the parsing &amp; running of the code that uses the appropriate database for the server to run time, as that what the EXEC statement at the end does.</p> <p><strong>UPDATE</strong></p> <p>Based on the additional comment below you could also rewrite this as:</p> <pre><code>DECLARE @sql NVARCHAR(4000); if ((select @@servername) = 'ServerA') begin select top 5 * from DatabaseA.dbo.SignUPRequest; end else if ((select @@servername) = 'ServerB') begin select top 5 * from DatabaseB.dbo.SignUPRequest; end </code></pre> <p>So, instead of putting in a <code>USE &lt;database-name&gt;</code> at the start, you can also more fully qualify the name of the table in your select statement. If you only have one line of SQL to deal with this could be more effective.</p>
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    1. POTrying to select database based on server
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    1. COGreat thanks--this will do it, and thanks for the explanation.
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    2. COHmm... The problem with the above is I'd have to repeat the statement(s) I want to run, or if I add to @sql outside of the if sections, I just get back 'Command(s) completed successfully.' instead of the results.
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    3. COThe "use" statement is now scoped within the EXEC so you revert back to what ever database you were in when you started when the EXEC completes. Incidentally, you were repeating the statements anyway, although not quite, because if you think about it within the scope of the database you're using they are referring to completely separate tables, and therefore not really the same statement (they just look the same because the scope they are executed in provides additional context to the parser)
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