diff --git a/src/sqlParser.jison b/src/sqlParser.jison
@@ -127,6 +127,7 @@ UNION                                                             return 'UNION'
[a-zA-Z_\u4e00-\u9fa5][a-zA-Z0-9_\u4e00-\u9fa5]*                  return 'IDENTIFIER'
\.                                                                return 'DOT'
['"][a-zA-Z_\u4e00-\u9fa5][a-zA-Z0-9_\u4e00-\u9fa5]*["']          return 'QUOTED_IDENTIFIER'

<<EOF>>                                                           return 'EOF'
.                                                                 return 'INVALID'
@@ -279,6 +280,8 @@ selectExprAliasOpt
  : { $$ = {alias: null, hasAs: null} }
  | AS IDENTIFIER { $$ = {alias: $2, hasAs: true} }
  | IDENTIFIER { $$ = {alias: $1, hasAs: false} }
  ;

string