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POWHERE Is Not Null Query
 

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  1. POWHERE Is Not Null Query
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    <p>I am using a very complex UNION ALL query to parse out information from an XML import into an existing Access table. I am running into an issue is when I am attempting to write the query to only populate the table if the field is not null. I have tried using an IIF statement at the beginning and I many different iterations various Null statements but all throw errors except this one which doesn't do anything</p> <pre><code> select SiteVisitCode + '-' AS Q_SiteVisitCode, IIf ([Sample_Collection_Method_ID] = "SED-CORE-C", SiteVisitCode + '-CC / ' + Station_Name, IIf ([Sample_Collection_Method_ID] = "CHLPHL-1-C", SiteVisitCode + '-CT / ' + Station_Name, IIf ([Sample_Collection_Method_ID] = "HOOP-C", SiteVisitCode + '-CH / ' + Station_Name, SiteVisitCode + '-C(A) / ' + Station_Name))), IIf ([Sample_Collection_Method_ID] = "SED-CORE-C", SiteVisitCode + '-CC ', IIf ([Sample_Collection_Method_ID] = "CHLPHL-1-C", SiteVisitCode + '-CT', IIf ([Sample_Collection_Method_ID] = "HOOP-C", SiteVisitCode + '-CH', SiteVisitCode + '-C(A)'))), 'S-ROUTINE' as Activity_Type, IIf ([Sample_Collection_Method_ID] = "SED-CORE", 'Sediment', IIf ([Sample_Collection_Method_ID] = "SED-CORE-C", 'Sediment','other')), IIF ([COMP]="TRUE", Right([TransectA],Len([TransectA])-InStrRev([TransectA],"/"))+'-C', Right([TransectA],Len([TransectA])-InStrRev([TransectA],"/"))) AS Sample_Collection_Method_ID, '' AS Activity_Comment, 'CLPH' as DEQ_SampleTypeID, 'A' as Activity_Transect, Station_Visit_Date as Activity_Start_Date, Time as Activity_Start_Time FROM tblSiteVisit WHERE [transectA] is Not Null UNION ALL select SiteVisitCode + '-' AS Q_SiteVisitCode, IIf ([Sample_Collection_Method_ID] = "SED-CORE-C", SiteVisitCode + '-CC / ' + Station_Name, IIf ([Sample_Collection_Method_ID] = "CHLPHL-1-C", SiteVisitCode + '-CT / ' + Station_Name, IIf ([Sample_Collection_Method_ID] = "HOOP-C", SiteVisitCode + '-CH / ' + Station_Name, SiteVisitCode + '-C(P) / ' + Station_Name))), IIf ([Sample_Collection_Method_ID] = "SED-CORE-C", SiteVisitCode + '-CC ', IIf ([Sample_Collection_Method_ID] = "CHLPHL-1-C", SiteVisitCode + '-CT', IIf ([Sample_Collection_Method_ID] = "HOOP-C", SiteVisitCode + '-CH', SiteVisitCode + '-C(P)'))), 'S-ROUTINE' as Activity_Type, IIf ([Sample_Collection_Method_ID] = "SED-CORE", 'Sediment', IIf ([Sample_Collection_Method_ID] = "SED-CORE-C", 'Sediment','other')), IIF ([COMP]="TRUE", Right([TransectP],Len([TransectP])-InStrRev([TransectP],"/"))+'-C', Right([TransectP],Len([TransectP])-InStrRev([TransectP],"/"))) AS Sample_Collection_Method_ID, '' AS Activity_Comment, 'CLPH' as Q_SampleTypeID, 'P' as Activity_Transect, Station_Visit_Date as Activity_Start_Date, Time as Activity_Start_Time FROM tblSiteVisit WHERE [transectP] is Not Null ; </code></pre> <p>In the example below the 2nd entry should not exist as transect P is null:</p> <pre><code>Q_SiteVisitCode|Sample_ID|Activity_ID|Activity_Type|Medium|Activity_Start_Date|Activity_Start_Time|Sample_Collection_Method_ID|Activity_Transect|DEQ_SampleTypeID|Activity_Comment test123-|test123-CT / Fish Hatchery|test123-CT|S-ROUTINE|other|12/26/2013|1058|CHLPHL-1-C|A|CLPH test123-|test123-C(P) / Fish Hatchery|test123-C(P)|S-ROUTINE|other|12/26/2013|1058|-C|P|CLPH </code></pre> <p>Any assistance would be greatly appreciated</p>
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    1. This table or related slice is empty.
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    1. This table or related slice is empty.
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      1. This table or related slice is empty.
      1. VTUpMod
    1. COHave you tried using a CASE statement in your query instead of the IIF?
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      1. USJohnny Bones
    2. COI'm having a little trouble understanding the way the data is coming in. It looks like you're selecting from a table in the SQL example. Is that the problem query? Is the pipe-delimited data representing that table?
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      1. USMike M
    3. COThe import is a XML which imports as a table, this then needs to parse out into other tables. Each of the transects is a column in the table (there are 16 transects) I only want to populate the existing table if there is data in the column for that particular transect. The problem I am having is that I get a return row even when the transect column of the original table is null.
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