diff --git a/modules/search_api_db/src/Plugin/search_api/backend/Database.php b/modules/search_api_db/src/Plugin/search_api/backend/Database.php
index e68bf5d1..219bf0c2 100644
--- a/modules/search_api_db/src/Plugin/search_api/backend/Database.php
+++ b/modules/search_api_db/src/Plugin/search_api/backend/Database.php
@@ -751,8 +751,6 @@ protected function findFreeColumn($table, $column) {
    *   (optional) The type of table being created. Either "index" (for the
    *   denormalized table for an entire index) or "field" (for field-specific
    *   tables).
-   *
-   * @todo Write a test to ensure a field named "value" doesn't break this.
    */
   protected function createFieldTable(FieldInterface $field = NULL, array $db, $type = 'field') {
     $new_table = !$this->database->schema()->tableExists($db['table']);
@@ -1954,7 +1952,7 @@ protected function createKeysQuery($keys, array $fields, array $all_fields, Inde
       }
 
       if (!$match_parts) {
-        $db_query->condition('word', $words, 'IN');
+        $db_query->condition('t.word', $words, 'IN');
       }
       else {
         $db_or = new Condition('OR');
@@ -1992,7 +1990,9 @@ protected function createKeysQuery($keys, array $fields, array $all_fields, Inde
         $db_query->condition($db_or);
       }
 
-      $db_query->condition('field_name', array_map([__CLASS__, 'getTextFieldName'], array_keys($fields)), 'IN');
+      $field_names = array_keys($fields);
+      $field_names = array_map([__CLASS__, 'getTextFieldName'], $field_names);
+      $db_query->condition('t.field_name', $field_names, 'IN');
     }
 
     if ($nested) {
@@ -2003,7 +2003,7 @@ protected function createKeysQuery($keys, array $fields, array $all_fields, Inde
           if (!$match_parts) {
             $word .= ' ';
             $var = ':word' . strlen($word);
-            $query->addExpression($var, 'word', [$var => $word]);
+            $query->addExpression($var, 't.word', [$var => $word]);
           }
           else {
             $i += $word_count;
@@ -2694,11 +2694,11 @@ public function getAutocompleteSuggestions(QueryInterface $query, SearchInterfac
         }
         $field_query = $this->database->select($fields[$field]['table'], 't');
         $field_query->fields('t', ['word', 'item_id'])
-          ->condition('field_name', $field)
-          ->condition('item_id', $all_results, 'IN');
+          ->condition('t.field_name', $field)
+          ->condition('t.item_id', $all_results, 'IN');
         if ($pass == 1) {
-          $field_query->condition('word', $incomplete_like, 'LIKE')
-            ->condition('word', $keys, 'NOT IN');
+          $field_query->condition('t.word', $incomplete_like, 'LIKE')
+            ->condition('t.word', $keys, 'NOT IN');
         }
         if (!isset($word_query)) {
           $word_query = $field_query;
@@ -2711,10 +2711,10 @@ public function getAutocompleteSuggestions(QueryInterface $query, SearchInterfac
         return [];
       }
       $db_query = $this->database->select($word_query, 't');
-      $db_query->addExpression('COUNT(DISTINCT item_id)', 'results');
+      $db_query->addExpression('COUNT(DISTINCT t.item_id)', 'results');
       $db_query->fields('t', ['word'])
-        ->groupBy('word')
-        ->having('COUNT(DISTINCT item_id) <= :max', [':max' => $max_occurrences])
+        ->groupBy('t.word')
+        ->having('COUNT(DISTINCT t.item_id) <= :max', [':max' => $max_occurrences])
         ->orderBy('results', 'DESC')
         ->range(0, $limit);
       $incomp_len = strlen($incomplete_key);
diff --git a/modules/search_api_db/tests/src/Kernel/BackendTest.php b/modules/search_api_db/tests/src/Kernel/BackendTest.php
index c22a7f1f..a8e5fab0 100644
--- a/modules/search_api_db/tests/src/Kernel/BackendTest.php
+++ b/modules/search_api_db/tests/src/Kernel/BackendTest.php
@@ -68,6 +68,30 @@ public function setUp() {
     ]);
 
     $this->installConfig(['search_api_test_db']);
+
+    // Add additional fields to the search index that have the same ID as
+    // column names used by this backend, to see whether this leads to any
+    // conflicts.
+    $index = $this->getIndex();
+    $fields_helper = \Drupal::getContainer()->get('search_api.fields_helper');
+    $column_names = [
+      'item_id',
+      'field_name',
+      'word',
+      'score',
+      'value',
+    ];
+    $field_info = [
+      'datasource_id' => 'entity:entity_test_mulrev_changed',
+      'property_path' => 'type',
+      'type' => 'string',
+    ];
+    foreach ($column_names as $column_name) {
+      $field_info['label'] = "Test field $column_name";
+      $field = $fields_helper->createField($index, $column_name, $field_info);
+      $index->addField($field);
+    }
+    $index->save();
   }
 
   /**
@@ -111,13 +135,18 @@ protected function checkServerBackend() {
       'body',
       'category',
       'created',
+      'field_name',
       'id',
+      'item_id',
       'keywords',
       'name',
+      'score',
       'search_api_datasource',
       'search_api_language',
       'type',
+      'value',
       'width',
+      'word',
     ];
     $actual_fields = array_keys($field_infos);
     sort($actual_fields);