diff --git a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableStatement.java b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableStatement.java
index 77cc5ac99f..e9ac4bc663 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableStatement.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableStatement.java
@@ -5,7 +5,7 @@ import java.util.List;
 
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 
-public class SQLAlterTableStatement extends SQLStatementImpl {
+public class SQLAlterTableStatement extends SQLStatementImpl implements SQLDDLStatement {
 
     private static final long       serialVersionUID = 1L;
 
diff --git a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateTableStatement.java b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateTableStatement.java
index 0dc3d692fe..6f87eb3353 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateTableStatement.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateTableStatement.java
@@ -23,7 +23,7 @@ import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
 @SuppressWarnings("serial")
-public class SQLCreateTableStatement extends SQLStatementImpl {
+public class SQLCreateTableStatement extends SQLStatementImpl implements SQLDDLStatement {
 
     protected Type                  type;
     protected SQLExprTableSource    tableSource;
diff --git a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateViewStatement.java b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateViewStatement.java
index 60270ab887..6e1c20beb9 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateViewStatement.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateViewStatement.java
@@ -23,7 +23,7 @@ import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLCreateViewStatement extends SQLStatementImpl {
+public class SQLCreateViewStatement extends SQLStatementImpl implements SQLDDLStatement {
 
     private static final long     serialVersionUID = 1L;
     protected SQLName             name;
diff --git a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLDDLStatement.java b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLDDLStatement.java
new file mode 100644
index 0000000000..9cf20e962d
--- /dev/null
+++ b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLDDLStatement.java
@@ -0,0 +1,8 @@
+package com.alibaba.druid.sql.ast.statement;
+
+import com.alibaba.druid.sql.ast.SQLStatement;
+
+
+public interface SQLDDLStatement extends SQLStatement {
+
+}
diff --git a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropTableStatement.java b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropTableStatement.java
index 61b4abbbad..1916a97723 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropTableStatement.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropTableStatement.java
@@ -22,7 +22,7 @@ import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLDropTableStatement extends SQLStatementImpl {
+public class SQLDropTableStatement extends SQLStatementImpl implements SQLDDLStatement {
 
     private static final long          serialVersionUID = 1L;