diff --git a/src/pg/sql/42_observatory_exploration.sql b/src/pg/sql/42_observatory_exploration.sql
index 8a72777..b40a0ae 100644
--- a/src/pg/sql/42_observatory_exploration.sql
+++ b/src/pg/sql/42_observatory_exploration.sql
@@ -62,7 +62,7 @@ BEGIN
         observatory.OBS_column_table,
         observatory.OBS_column
       WHERE
-        observatory.OBS_column_table.column_id = observatory.obs_column.id
+        observatory.OBS_column_table.column_id = observatory.obs_column.id AND
         observatory.OBS_column_table.table_id = observatory.obs_table.id
       AND
         observatory.OBS_column.type='Geometry'