diff --git a/src/Sql/AbstractSql.php b/src/Sql/AbstractSql.php
index 9265325..563a566 100644
--- a/src/Sql/AbstractSql.php
+++ b/src/Sql/AbstractSql.php
@@ -350,8 +350,12 @@ public function quoteId(string $identifier): string
                 $identifierAry[$key] = ($val != '*') ? $this->openQuote . $val . $this->closeQuote : $val;
             }
             $quotedId = implode('.', $identifierAry);
+        } else if (($identifier != '*') &&
+            ((preg_match('/^\$\d*\d$/', $identifier) == 0) && !is_int($identifier) &&
+                !is_float($identifier) && (preg_match('/^\d*$/', $identifier) == 0))) {
+            $quotedId = $this->openQuote . $identifier . $this->closeQuote;
         } else {
-            $quotedId = ($identifier != '*') ? $this->openQuote . $identifier . $this->closeQuote : $identifier;
+            $quotedId = $identifier;
         }
 
         return $quotedId;
@@ -452,4 +456,4 @@ protected function initQuoteType(): void
         }
     }
 
-}
\ No newline at end of file
+}