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I have an attribute field in my file geodatabase (GDB) where I'm trying to select all records that contain an underbar in the string field. The issue is that the underbar is considered a SQL wildcard on its own.

To illustrate: I need all data similar to "ID" = '42W_42_42E' or "ID" = '31A_31'

Using "ID" LIKE '%_%' returns all records, which isn't helpful. The perfect solution would simply return a count on the number of records with the underbar in their ID attribute.

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From the page on SQL reference for query expressions used in ArcGIS

To include the percent symbol or underscore in your search string, use the ESCAPE keyword to designate another character as the escape character, which in turn indicates that a real percent sign or underscore immediately follows.

For example, this expression returns any string containing 10%, such as 10% DISCOUNT or A10%:

"AMOUNT" LIKE '%10$%%' ESCAPE '$'

For your case, try the following:

ID LIKE '%$_%' ESCAPE '$'
  • Thank you very much, i wasn't aware of the ESCAPE functionality. I searched through the stack pages but somehow overlooked that one. – M.Smith Mar 30 '16 at 19:00

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