MariaDB [landscapefor]> SELECT wikidata_code, GROUP_CONCAT(poi_ID) FROM poi WHERE wikidata_code <> '' GROUP BY wikidata_code HAVING COUNT(*) > 1 ORDER BY COUNT(*) DESC;
+---------------+----------------------+
| wikidata_code | GROUP_CONCAT(poi_ID) |
+---------------+----------------------+
| Q1033649      | 10112,9581           |
| Q10339        | 8970,14599           |
| Q1054748      | 15765,15886          |
| Q1066935      | 10149,8040           |
| Q111942       | 9568,14422           |
| Q122476       | 8283,8241            |
| Q128202       | 10184,14953          |
| Q131148       | 10205,12780          |
| Q13145        | 14844,7312           |
| Q1324513      | 9269,13529           |
| Q1332930      | 11249,11098          |
| Q1380173      | 8297,8150            |
| Q1585931      | 13493,8101           |
| Q162965       | 15266,15071          |
| Q16596814     | 8939,11071           |
| Q1707242      | 6503,8778            |
| Q17798        | 14315,14651          |
| Q178813       | 13469,11651          |
| Q18040        | 14286,14659          |
| Q18356        | 14264,14637          |
| Q18365        | 14267,14644          |
| Q18368        | 14268,14643          |
| Q18416884     | 10661,10770          |
| Q18755063     | 8108,7944            |
| Q1903         | 12755,16045          |
| Q1916826      | 16018,15043          |
| Q19840        | 7271,16180           |
| Q19846        | 7273,16300           |
| Q20099        | 14341,14638          |
| Q20109        | 14344,14649          |
| Q20191        | 14367,14650          |
| Q20251        | 14648,14383          |
| Q2034331      | 15070,15268          |
| Q2047639      | 8439,8348            |
| Q20478        | 14372,14890          |
| Q20494        | 15028,14896          |
| Q2077168      | 11282,11427          |
| Q21013539     | 16553,16579          |
| Q21192547     | 14489,14485          |
| Q21192550     | 9563,10943           |
| Q21552096     | 9265,9266            |
| Q21552273     | 9204,9280            |
| Q224172       | 14350,14902          |
| Q23291        | 14697,14288          |
| Q2506967      | 10965,11857          |
| Q254139       | 14455,14561          |
| Q266604       | 14463,14544          |
| Q266794       | 14457,14554          |
| Q266941       | 14550,14460          |
| Q266975       | 14547,14449          |
| Q268067       | 14257,14470          |
| Q268995       | 14471,14320          |
| Q269516       | 14404,14474          |
| Q269823       | 14445,14482          |
| Q270032       | 14560,14466          |
| Q270189       | 14456,14571          |
| Q270320       | 14979,14556          |
| Q270328       | 14564,15015          |
| Q270492       | 14526,14441          |
| Q270548       | 14512,15014          |
| Q270613       | 14527,14462          |
| Q270782       | 14506,14454          |
| Q271152       | 14511,14451          |
| Q271236       | 14446,14517          |
| Q271358       | 14528,14444          |
| Q28001134     | 7041,7065            |
| Q2967848      | 9398,7825            |
| Q2968191      | 8829,14751           |
| Q30159213     | 12387,12642          |
| Q3328396      | 9366,15991           |
| Q3361323      | 10637,10944          |
| Q3364763      | 13187,13299          |
| Q34805        | 14994,14708          |
| Q35082        | 14754,14340          |
| Q35226        | 14226,14718          |
| Q358729       | 13328,14696          |
| Q3649109      | 8766,10617           |
| Q3657503      | 15804,16428          |
| Q3662426      | 10052,11652          |
| Q3662456      | 9610,9648            |
| Q3718646      | 8912,15404           |
| Q3757770      | 15285,9066           |
| Q3763803      | 9230,9232            |
| Q376739       | 8897,9080            |
| Q3785099      | 14180,14073          |
| Q3867520      | 8925,9025            |
| Q3867716      | 9135,16096           |
| Q3867764      | 8009,8047            |
| Q3867831      | 9173,9172            |
| Q3867851      | 8262,8263            |
| Q3867963      | 9037,8790            |
| Q3867973      | 9024,9005            |
| Q3868051      | 8677,9075            |
| Q3868253      | 8885,8886            |
| Q3868400      | 7993,7994            |
| Q3868487      | 9151,9022            |
| Q3886621      | 15832,16466          |
| Q3886642      | 15944,16441          |
| Q3889575      | 16554,15277          |
| Q3889607      | 14759,6493           |
| Q3889659      | 10800,10632          |
| Q3890190      | 15254,15264          |
| Q3890261      | 15287,15286          |
| Q3890698      | 13602,13612          |
| Q3892388      | 14518,14686          |
| Q3895631      | 14591,13206          |
| Q3895646      | 13216,16177          |
| Q3895647      | 13217,14666          |
| Q3895726      | 14083,13180          |
| Q3934723      | 11345,11336          |
| Q3936898      | 10762,10555          |
| Q3951389      | 10456,10245          |
| Q4011905      | 6985,6977            |
| Q47467390     | 15045,13962          |
| Q50119        | 15133,15132          |
| Q54087650     | 8914,8525            |
| Q54874186     | 9059,9058            |
| Q55354223     | 8004,8003            |
| Q55370383     | 16161,8884           |
| Q55372377     | 14812,8944           |
| Q55375790     | 8823,8840            |
| Q55379362     | 8237,8238            |
| Q55391578     | 9733,9732            |
| Q55686292     | 11359,11360          |
| Q55832719     | 11241,10842          |
| Q574879       | 13491,13490          |
| Q58844        | 13273,14184          |
| Q606494       | 7856,7891            |
| Q635414       | 13324,14116          |
| Q867361       | 13318,7208           |
+---------------+----------------------+
130 rows in set (0.03 sec)