From 86516e4fc06bb4d0a3a87f221c802b43bda79a95 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=AB=98=E9=93=81?= <szujobs@gmail.com>
Date: Tue, 3 Oct 2017 23:54:03 -0500
Subject: [PATCH] Updated Druid_SQL_AST (markdown)

---
 Druid_SQL_AST.md | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/Druid_SQL_AST.md b/Druid_SQL_AST.md
index 8ced183..0261f70 100644
--- a/Druid_SQL_AST.md
+++ b/Druid_SQL_AST.md
@@ -163,7 +163,8 @@ class SQLUnionQuery implements SQLSelectQuery {
 }
 ```
 
-## 2.5 SQLCreateTableStatement
+## 2.5. SQLCreateTableStatement
+建表语句包含了一系列方法，用于方便各种操作
 ```java
 public class SQLCreateTableStatement extends SQLStatementImpl implements SQLDDLStatement, SQLCreateStatement {
     SQLExprTableSource tableSource;
@@ -174,7 +175,10 @@ public class SQLCreateTableStatement extends SQLStatementImpl implements SQLDDLS
     public SQLColumnDefinition findColumn(String columName) {}
 
     // 忽略大小写的查找SQLCreateTableStatement中的column关联的索引
-    public SQLTableElement findIndex(String columnName);
+    public SQLTableElement findIndex(String columnName) {}
+
+    // 是否外键依赖另外一个表
+    public boolean isReferenced(String tableName) {}
 }
 ```