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I am currently wondering what is the fastest way of using Select By Attributes in arcpy. I have a GDB with a feature class that is quite big. This feature class has a field called CODE with values of type LONG.

I want to select 3 types of these features, namely the ones that have either 5020, 5601 or 8002 in the CODE field.

I tried running the following code:

SelectByAttribute=' "CODE" = ' 5020 ' OR "CODE" = ' 5601 ' OR "CODE" = ' 8002
arcpy.SelectLayerByAttribute_management("Bat_StudyArea", "NEW_Selection", SelectByAttribute)

I am getting a syntax error, but I am too blind to find the error.

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    Your SelectByAttribute string is not properly build. Try using this one: 'CODE = 5020 OR CODE = 5601 OR CODE = 8002'. Your values are numeric so you don't need to wrap quotes around them. – Marcelo Villa May 31 at 15:29
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    For a pick list, use CODE in (5020, 5601, 8002) – Vince May 31 at 15:35
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    If this is a database you use often, you may want to add an attribute/secondary index for the DB on the Code field. That will cost a small amount of disk space but should in theory speed up selects in ArcMap or ArcPy. And I echo what Vince said: it is a lot easier to read and avoid typos when you use IN for selects. – danak May 31 at 15:38
  • Ok thanks for your input! Did not thought it was that easy! – Cliff May 31 at 16:24
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Use IN in your SQL query, and don't include single quotes for numeric field values.

CODE in (5020, 5601, 8002)

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Check your quotation marks, also look at the ESRI SQL reference page

Try this:
SelectByAttribute = """CODE = '5020' OR CODE = '5601' OR CODE = '8002'""" arcpy.SelectLayerByAttribute_management("Bat_StudyArea", "NEW_Selection", SelectByAttribute)

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