Mysql 艾丽，这是我需要的。我第一次肯定犯了一些愚蠢的语法错误。非常感谢@user2364198我已经用你的数据更新了SQLFIDLE。它给你的正是你所要求的。 ID FEATURE_CLASS FEATURE_ID FEATURE_NAME

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艾丽，这是我需要的。我第一次肯定犯了一些愚蠢的语法错误。非常感谢@user2364198我已经用你的数据更新了SQLFIDLE。它给你的正是你所要求的。

    ID  FEATURE_CLASS   FEATURE_ID  FEATURE_NAME    CENSUS_CODE     CENSUS_CLASS_CODE   GSA_CODE    OPM_CODE    STATE_NUMERIC   STATE_ALPHA     COUNTY_SEQUENCE     COUNTY_NUMERIC  COUNTY_NAME     DATE_CREATED    PRIMARY_LATITUDE    PRIMARY_LONGITUDE   DATE_EDITED     fips    COUNTRY_NAME    POPULATION_DATA     city_county_allocate    is_county
    146627  Populated Place     1616849     Wyandotte   88900   P1  5310    265310163   26  MI  1   163     Wayne   1980-04-14 00:00:00     42.2142064  -83.1499239     03/20/2008  26163   US  25883   100     1
    147139  Populated Place     1617956     Wyandotte   88890   U6  NULL    NULL    26  MI  1   61  Houghton    1980-04-14 00:00:00     46.8899335  -88.8754114     NULL    26061   US  0   0   0

    34  Populated Place     2195    Bumstead    8360    U6  NULL    NULL    4   AZ  1   13  Maricopa    1980-02-08 00:00:00     33.5733726  -112.3568269    NULL    04013   US  0   0   0

SELECT  ... -- Add all the field you need from both intances of your table below
FROM    fedcodes T1 -- First instance of your table
INNER JOIN
        fedcodes T2 -- Second instance of your table
ON      T1.FEATURE_NAME = T2.FEATURE_NAME
AND     T1.STATE_ALPHA = T2.STATE_ALPHA 
AND     T1.COUNTY_NAME <> T2.COUNTY_NAME 

SELECT f1.* 
 FROM fedcodes f1 JOIN
      fedcodes f2 ON f1.feature_name = f2.feature_name
                 AND f1.state_alpha = f2.state_alpha 
                 AND f1.county_name <> f2.county_name