diff --git a/src/grung/db.py b/src/grung/db.py
index ddce634..ba970f1 100644
--- a/src/grung/db.py
+++ b/src/grung/db.py
@@ -51,22 +51,18 @@ class RecordTable(table.Table):
         self._check_unique(document)
 
     def _check_unique(self, document) -> bool:
-        matches = [
-            dict(match)
-            for match in super().search(
-                reduce(
-                    ior,
-                    [
-                        Query()[field.name].matches(document[field.name], flags=re.IGNORECASE)
-                        for field in document._metadata.fields.values()
-                        if field.unique
-                    ],
-                )
-            )
-            if match.doc_id != document.doc_id
-        ]
+        matches = []
+        queries = reduce(
+            ior,
+            [
+                Query()[field.name].matches(document[field.name], flags=re.IGNORECASE)
+                for field in document._metadata.fields.values()
+                if field.unique
+            ],
+        )
+        matches = [dict(match) for match in super().search(queries) if match.doc_id != document.doc_id]
         if matches != []:
-            raise UniqueConstraintError(document, matches)
+            raise UniqueConstraintError(document, queries, matches)
 
 
 class GrungDB(TinyDB):
diff --git a/src/grung/exceptions.py b/src/grung/exceptions.py
index 9b60c50..711e32c 100644
--- a/src/grung/exceptions.py
+++ b/src/grung/exceptions.py
@@ -3,10 +3,11 @@ class UniqueConstraintError(Exception):
     Thrown when a db write operation cannot complete due to a field's unique constraint.
     """
 
-    def __init__(self, document, collisions):
+    def __init__(self, document, query, collisions):
         super().__init__(
             "\n"
             f"  * Record:  {dict(document)}\n"
+            f"  * Query:   {query}\n"
             f"  * Error:   Unique constraint failure\n"
             "   * The record matches the following existing records:\n\n" + "\n".join(str(c) for c in collisions)
         )