diff --git a/library/think/db/builder/Mysql.php b/library/think/db/builder/Mysql.php
index 465e9485..94f82b83 100644
--- a/library/think/db/builder/Mysql.php
+++ b/library/think/db/builder/Mysql.php
@@ -105,7 +105,8 @@ class Mysql extends Builder
                 $table = $options['alias'][$table];
             }
         }
-        if ($strict || !preg_match('/[,\'\"\*\(\)`.\s]/', $key)) {
+
+        if ('*' != $key && ($strict || !preg_match('/[,\'\"\*\(\)`.\s]/', $key))) {
             $key = '`' . $key . '`';
         }
         if (isset($table)) {
diff --git a/library/think/db/builder/Sqlsrv.php b/library/think/db/builder/Sqlsrv.php
index b97886ac..e904827a 100644
--- a/library/think/db/builder/Sqlsrv.php
+++ b/library/think/db/builder/Sqlsrv.php
@@ -92,7 +92,7 @@ class Sqlsrv extends Builder
                 $table = $options['alias'][$table];
             }
         }
-        if ($strict || !preg_match('/[,\'\"\*\(\)\[.\s]/', $key)) {
+        if ('*' != $key && ($strict || !preg_match('/[,\'\"\*\(\)\[.\s]/', $key))) {
             $key = '[' . $key . ']';
         }
         if (isset($table)) {