diff --git a/advisor/index.go b/advisor/index.go
index 03581b86fb1ae35e7e1c75811bbcd32beb959b8c..0c00818eddc5ef96b2e0dc6018f028a4fc75a129 100644
--- a/advisor/index.go
+++ b/advisor/index.go
@@ -135,7 +135,7 @@ func NewAdvisor(env *env.VirtualEnv, rEnv database.Connector, q Query4Audit) (*I
 		whereINEQ: ast.FindWhereINEQ(q.Stmt),
 		groupBy:   ast.FindGroupByCols(q.Stmt),
 		orderBy:   ast.FindOrderByCols(q.Stmt),
-		where:     ast.FindAllCols(q.Stmt, "where"),
+		where:     ast.FindAllCols(q.Stmt, ast.WhereExpression),
 		IndexMeta: make(map[string]map[string]*database.TableIndexInfo),
 	}, nil
 }
diff --git a/ast/meta.go b/ast/meta.go
index 25e04a9da4f1991d838ba8e3110bc9ac37022e81..48323ffd86c1c75c9adb8ea281aeb71770e91c77 100644
--- a/ast/meta.go
+++ b/ast/meta.go
@@ -450,15 +450,15 @@ func FindJoinTable(node sqlparser.SQLNode, meta common.Meta) common.Meta {
 		switch expr := node.(type) {
 		case *sqlparser.JoinTableExpr:
 			switch expr.Join {
-			case "join", "natural join":
+			case sqlparser.JoinStr, sqlparser.NaturalJoinStr:
 				// 两边表都需要
 				findJoinTable(expr.LeftExpr, meta)
 				findJoinTable(expr.RightExpr, meta)
-			case "left join", "natural left join", "straight_join":
+			case sqlparser.LeftJoinStr, sqlparser.NaturalLeftJoinStr, sqlparser.StraightJoinStr:
 				// 只需要右表
 				findJoinTable(expr.RightExpr, meta)
 
-			case "right join", "natural right join":
+			case sqlparser.RightJoinStr, sqlparser.NaturalRightJoinStr:
 				// 只需要左表
 				findJoinTable(expr.LeftExpr, meta)
 			}
@@ -673,8 +673,22 @@ func FindAllCondition(node sqlparser.SQLNode) []interface{} {
 	return conditions
 }
 
+// Expression describe sql expression type
+type Expression string
+
+const (
+	// WhereExpression 用于标记 where
+	WhereExpression Expression = "where"
+	// JoinExpression 用于标记 join
+	JoinExpression Expression = "join"
+	// GroupByExpression 用于标记 group by
+	GroupByExpression Expression = "group by"
+	// OrderByExpression 用于标记 order by
+	OrderByExpression Expression = "order by"
+)
+
 // FindAllCols 获取 AST 中某个节点下所有的 columns
-func FindAllCols(node sqlparser.SQLNode, targets ...string) []*common.Column {
+func FindAllCols(node sqlparser.SQLNode, targets ...Expression) []*common.Column {
 	var result []*common.Column
 	// 获取节点内所有的列
 	f := func(node sqlparser.SQLNode) {
@@ -699,25 +713,24 @@ func FindAllCols(node sqlparser.SQLNode, targets ...string) []*common.Column {
 	} else {
 		// 根据target获取所有的节点
 		for _, target := range targets {
-			target = strings.Replace(strings.ToLower(target), " ", "", -1)
 			err := sqlparser.Walk(func(node sqlparser.SQLNode) (kontinue bool, err error) {
 				switch node := node.(type) {
 				case *sqlparser.Subquery:
 					// 忽略子查询
 				case *sqlparser.JoinTableExpr:
-					if target == "join" {
+					if target == JoinExpression {
 						f(node)
 					}
 				case *sqlparser.Where:
-					if target == "where" {
+					if target == WhereExpression {
 						f(node)
 					}
-				case *sqlparser.GroupBy:
-					if target == "groupby" {
+				case sqlparser.GroupBy:
+					if target == GroupByExpression {
 						f(node)
 					}
 				case sqlparser.OrderBy:
-					if target == "orderby" {
+					if target == OrderByExpression {
 						f(node)
 					}
 				}
diff --git a/ast/meta_test.go b/ast/meta_test.go
index 60b7c54768eede4784dd3179cb323c0a15e63470..f072978ec88b4cc376b8f8e486bae1e98a15a964 100644
--- a/ast/meta_test.go
+++ b/ast/meta_test.go
@@ -270,29 +270,31 @@ func TestFindColumn(t *testing.T) {
 
 func TestFindAllCols(t *testing.T) {
 	sqlList := []string{
-		"SELECT * FROM t1 LEFT JOIN (t2 CROSS JOIN t3 CROSS JOIN t4) ON (t2.a = t1.a AND t3.b = t1.b AND t4.c = t1.c)",
-		"select t from a LEFT JOIN b USING (c1, c2, c3)",
-		"select ID,name from (select address from customer_list where SID=1 order by phone limit 50,10) a join customer_list l on (a.address=l.address) join city c on (c.city=l.city) order by phone desc;",
-		"SELECT * FROM t1 LEFT JOIN (t2, t3, t4) ON (t2.a = t1.a AND t3.b = t1.b AND t4.c = t1.c)",
-		"SELECT * FROM t1 RIGHT JOIN (t2, t3, t4) ON (t2.a = t1.a AND t3.b = t1.b AND t4.c = t1.c)",
-		"SELECT left_tbl.* FROM left_tbl LEFT JOIN right_tbl ON left_tbl.id = right_tbl.id WHERE right_tbl.id IS NULL;",
-		"SELECT left_tbl.* FROM left_tbl RIGHT JOIN right_tbl ON left_tbl.id = right_tbl.id WHERE right_tbl.id IS NULL;",
-		"SELECT * FROM t1 where a in ('a','b')",
-		"SELECT * FROM t1 where a BETWEEN 'bar' AND 'foo'",
-		"SELECT * FROM t1 where a = sum(a,b)",
-		"SELECT distinct a FROM t1 where a = '2001-01-01 01:01:01'",
+		"select * from tb where a = '1' order by c",
+		"select * from tb where a = '1' group by c",
+		"select * from tb where c = '1' group by a",
+		"select * from tb join tb2 on c = c where c = '1' group by a",
 	}
 
-	for _, sql := range sqlList {
-		fmt.Println(sql)
+	targets := []Expression{
+		OrderByExpression,
+		GroupByExpression,
+		WhereExpression,
+		JoinExpression,
+	}
+
+	for i, sql := range sqlList {
 		stmt, err := sqlparser.Parse(sql)
-		// pretty.Println(stmt)
 		if err != nil {
-			panic(err)
+			t.Error(err)
+			return
 		}
 
-		columns := FindAllCols(stmt, "order by")
-		pretty.Println(columns)
+		columns := FindAllCols(stmt, targets[i])
+		if columns[0].Name != "c" {
+			fmt.Println(sql)
+			t.Error(fmt.Errorf("want 'c' got %v", columns))
+		}
 	}
 }