diff --git a/docbow_project/docbow/sql.py b/docbow_project/docbow/sql.py
index c3d77d9..799e029 100644
--- a/docbow_project/docbow/sql.py
+++ b/docbow_project/docbow/sql.py
@@ -68,11 +68,10 @@ GET_UNSEEN_DOCUMENTS_SQL = '''SELECT d.id
     FROM docbow_document AS d
     INNER JOIN docbow_mailbox AS mb
         ON mb.outbox = %%s AND mb.document_id = d.id AND mb.owner_id IN %s
-    LEFT JOIN docbow_seendocument as sd
-        ON sd.document_id = d.id AND sd.user_id = %%s
-    LEFT JOIN docbow_deleteddocument AS dd ON
-        dd.document_id = d.id AND dd.user_id = %%s
-    WHERE dd.id IS NULL AND sd.id IS NULL AND (d.private = %%s OR (mb.owner_id = %%s AND d.private = %%s))
+    WHERE
+        NOT EXISTS(SELECT 1 FROM docbow_deleteddocument dd WHERE dd.document_id = d.id AND dd.user_id = %%s)
+        AND NOT EXISTS(SELECT 1 FROM docbow_seendocument sd WHERE sd.document_id = d.id AND sd.user_id = %%s)
+        AND (d.private = %%s OR (mb.owner_id = %%s AND d.private = %%s))
     GROUP BY d.id, d.date
     ORDER BY d.date
     '''
@@ -81,9 +80,9 @@ GET_DOCUMENTS_SQL = '''SELECT d.id
     FROM docbow_document AS d
     INNER JOIN docbow_mailbox AS mb ON
         mb.outbox = %%s AND mb.document_id = d.id AND mb.owner_id IN %s
-    LEFT JOIN docbow_deleteddocument AS dd ON
-        dd.document_id = d.id AND dd.user_id = %%s
-    WHERE dd.id IS NULL AND (d.private = %%s OR (mb.owner_id = %%s AND d.private = %%s))
+    WHERE
+        NOT EXISTS(SELECT 1 FROM docbow_deleteddocument dd WHERE dd.document_id = d.id AND dd.user_id = %%s)
+        AND (d.private = %%s OR (mb.owner_id = %%s AND d.private = %%s))
     GROUP BY d.id, d.date
     ORDER BY d.date'''
 
@@ -93,8 +92,8 @@ GET_TRASH_DOCUMENTS_SQL = '''SELECT d.id
     INNER JOIN docbow_mailbox AS mb ON
         mb.outbox = %%s AND mb.document_id = d.id AND mb.owner_id IN %s
     LEFT JOIN docbow_deleteddocument AS dd ON
-        dd.document_id = d.id AND dd.user_id = %%s
-    WHERE dd.soft_delete AND (d.private = %%s OR (mb.owner_id = %%s AND d.private = %%s))
+        dd.document_id = d.id AND dd.user_id = %%s AND dd.soft_delete
+    WHERE (d.private = %%s OR (mb.owner_id = %%s AND d.private = %%s))
     GROUP BY d.id, d.date
     ORDER BY d.date'''