diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleAlterTableAddColumn.java b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableAddColumn.java
similarity index 61%
rename from src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleAlterTableAddColumn.java
rename to src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableAddColumn.java
index 32c659dd2b..f1c0dbce0b 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleAlterTableAddColumn.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableAddColumn.java
@@ -1,19 +1,19 @@
-package com.alibaba.druid.sql.dialect.oracle.ast.stmt;
+package com.alibaba.druid.sql.ast.statement;
 
 import java.util.ArrayList;
 import java.util.List;
 
-import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
-import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
+import com.alibaba.druid.sql.ast.SQLObjectImpl;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class OracleAlterTableAddColumn extends OracleAlterTableItem {
+public class SQLAlterTableAddColumn extends SQLObjectImpl implements SQLAlterTableItem {
 
     private static final long         serialVersionUID = 1L;
 
     private List<SQLColumnDefinition> columns          = new ArrayList<SQLColumnDefinition>();
 
     @Override
-    public void accept0(OracleASTVisitor visitor) {
+    protected void accept0(SQLASTVisitor visitor) {
         if (visitor.visit(this)) {
             acceptChild(visitor, columns);
         }
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 e9ac4bc663..777649f2fa 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
@@ -3,6 +3,7 @@ package com.alibaba.druid.sql.ast.statement;
 import java.util.ArrayList;
 import java.util.List;
 
+import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 
 public class SQLAlterTableStatement extends SQLStatementImpl implements SQLDDLStatement {
@@ -28,4 +29,14 @@ public class SQLAlterTableStatement extends SQLStatementImpl implements SQLDDLSt
         this.tableSource = tableSource;
     }
 
+    public SQLName getName() {
+        if (getTableSource() == null) {
+            return null;
+        }
+        return (SQLName) getTableSource().getExpr();
+    }
+
+    public void setName(SQLName name) {
+        this.setTableSource(new SQLExprTableSource(name));
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlAlterTableStatement.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlAlterTableStatement.java
index 2430569058..865d0b3470 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlAlterTableStatement.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlAlterTableStatement.java
@@ -1,8 +1,24 @@
 package com.alibaba.druid.sql.dialect.mysql.ast.statement;
 
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableStatement;
+import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class MySqlAlterTableStatement extends MySqlStatementImpl {
+
+public class MySqlAlterTableStatement extends SQLAlterTableStatement {
 
     private static final long serialVersionUID = 1L;
 
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        if (visitor instanceof MySqlASTVisitor) {
+            accept0((MySqlASTVisitor) visitor);
+        } else {
+            throw new IllegalArgumentException("not support visitor type : " + visitor.getClass().getName());
+        }
+    }
+    
+    public void accept0(MySqlASTVisitor visitor) {
+        throw new UnsupportedOperationException(this.getClass().getName());
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleAlterTableStatement.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleAlterTableStatement.java
index 9a357bcb4b..0c83ded0f7 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleAlterTableStatement.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleAlterTableStatement.java
@@ -1,8 +1,6 @@
 package com.alibaba.druid.sql.dialect.oracle.ast.stmt;
 
-import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.statement.SQLAlterTableStatement;
-import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
@@ -41,15 +39,4 @@ public class OracleAlterTableStatement extends SQLAlterTableStatement implements
     public void setInvalidateGlobalIndexes(boolean invalidateGlobalIndexes) {
         this.invalidateGlobalIndexes = invalidateGlobalIndexes;
     }
-
-    public SQLName getName() {
-        if (getTableSource() == null) {
-            return null;
-        }
-        return (SQLName) getTableSource().getExpr();
-    }
-
-    public void setName(SQLName name) {
-        this.setTableSource(new SQLExprTableSource(name));
-    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleStatementParser.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleStatementParser.java
index 4b69ceae1e..b4b089fc11 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleStatementParser.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleStatementParser.java
@@ -27,6 +27,7 @@ import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator;
 import com.alibaba.druid.sql.ast.expr.SQLCharExpr;
 import com.alibaba.druid.sql.ast.expr.SQLNullExpr;
 import com.alibaba.druid.sql.ast.expr.SQLQueryExpr;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddColumn;
 import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
 import com.alibaba.druid.sql.ast.statement.SQLConstaint;
 import com.alibaba.druid.sql.ast.statement.SQLDropTableStatement;
@@ -46,7 +47,6 @@ import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterIndexStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterProcedureStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterSessionStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterSynonymStatement;
-import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableAddColumn;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableAddConstaint;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableDropPartition;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableItem;
@@ -816,7 +816,7 @@ public class OracleStatementParser extends SQLStatementParser {
                 if (lexer.token() == Token.LPAREN) {
                     lexer.nextToken();
 
-                    OracleAlterTableAddColumn item = new OracleAlterTableAddColumn();
+                    SQLAlterTableAddColumn item = new SQLAlterTableAddColumn();
 
                     for (;;) {
                         SQLColumnDefinition columnDef = this.exprParser.parseColumn();
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleASTVisitor.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleASTVisitor.java
index c3396c00ff..376e0dc6ac 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleASTVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleASTVisitor.java
@@ -16,6 +16,7 @@
 package com.alibaba.druid.sql.dialect.oracle.visitor;
 
 import com.alibaba.druid.sql.ast.expr.SQLObjectCreateExpr;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddColumn;
 import com.alibaba.druid.sql.dialect.oracle.ast.OracleHint;
 import com.alibaba.druid.sql.dialect.oracle.ast.OracleOrderBy;
 import com.alibaba.druid.sql.dialect.oracle.ast.clause.CycleClause;
@@ -56,7 +57,6 @@ import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterIndexStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterProcedureStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterSessionStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterSynonymStatement;
-import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableAddColumn;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableAddConstaint;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableDropPartition;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableModify;
@@ -473,10 +473,6 @@ public interface OracleASTVisitor extends SQLASTVisitor {
 
     void endVisit(OracleAlterTableModify x);
 
-    boolean visit(OracleAlterTableAddColumn x);
-
-    void endVisit(OracleAlterTableAddColumn x);
-
     boolean visit(OracleCreateIndexStatement x);
 
     void endVisit(OracleCreateIndexStatement x);
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleASTVisitorAdapter.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleASTVisitorAdapter.java
index 252e056954..e322d904b3 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleASTVisitorAdapter.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleASTVisitorAdapter.java
@@ -50,7 +50,6 @@ import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterIndexStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterProcedureStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterSessionStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterSynonymStatement;
-import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableAddColumn;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableAddConstaint;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableDropPartition;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableModify;
@@ -1032,16 +1031,6 @@ public class OracleASTVisitorAdapter extends SQLASTVisitorAdapter implements Ora
 
     }
 
-    @Override
-    public boolean visit(OracleAlterTableAddColumn x) {
-        return true;
-    }
-
-    @Override
-    public void endVisit(OracleAlterTableAddColumn x) {
-
-    }
-
     @Override
     public boolean visit(OracleCreateIndexStatement x) {
         return true;
@@ -1391,15 +1380,15 @@ public class OracleASTVisitorAdapter extends SQLASTVisitorAdapter implements Ora
     public void endVisit(OracleSavePointStatement x) {
 
     }
-    
+
     @Override
     public boolean visit(OracleCreateProcedureStatement x) {
         return true;
     }
-    
+
     @Override
     public void endVisit(OracleCreateProcedureStatement x) {
-        
+
     }
 
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleOutputVisitor.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleOutputVisitor.java
index b52957e4f2..559747344b 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleOutputVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleOutputVisitor.java
@@ -88,7 +88,6 @@ import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterIndexStatement.R
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterProcedureStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterSessionStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterSynonymStatement;
-import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableAddColumn;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableAddConstaint;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableDropPartition;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableModify;
@@ -2179,19 +2178,6 @@ public class OracleOutputVisitor extends SQLASTOutputVisitor implements OracleAS
 
     }
 
-    @Override
-    public boolean visit(OracleAlterTableAddColumn x) {
-        print("ADD (");
-        printAndAccept(x.getColumns(), ", ");
-        print(")");
-        return false;
-    }
-
-    @Override
-    public void endVisit(OracleAlterTableAddColumn x) {
-
-    }
-
     @Override
     public boolean visit(OracleCreateIndexStatement x) {
         print("CREATE INDEX ");
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleSchemaStatVisitor.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleSchemaStatVisitor.java
index 6e017733b6..3597b27c12 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleSchemaStatVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleSchemaStatVisitor.java
@@ -11,6 +11,7 @@ import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
 import com.alibaba.druid.sql.ast.expr.SQLObjectCreateExpr;
 import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddColumn;
 import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
 import com.alibaba.druid.sql.ast.statement.SQLCreateTableStatement;
 import com.alibaba.druid.sql.ast.statement.SQLDeleteStatement;
@@ -69,7 +70,6 @@ import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterIndexStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterProcedureStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterSessionStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterSynonymStatement;
-import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableAddColumn;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableAddConstaint;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableDropPartition;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterTableModify;
@@ -1422,23 +1422,6 @@ public class OracleSchemaStatVisitor extends SchemaStatVisitor implements Oracle
 
     }
 
-    @Override
-    public boolean visit(OracleAlterTableAddColumn x) {
-        OracleAlterTableStatement stmt = (OracleAlterTableStatement) x.getParent();
-        String table = stmt.getName().toString();
-
-        for (SQLColumnDefinition column : x.getColumns()) {
-            String columnName = column.getName().toString();
-            addColumn(table, columnName);
-        }
-        return false;
-    }
-
-    @Override
-    public void endVisit(OracleAlterTableAddColumn x) {
-
-    }
-
     @Override
     public boolean visit(OracleCreateIndexStatement x) {
         this.setCurrentTable(x);
diff --git a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java
index 38b77c1c0b..2571a3c00f 100644
--- a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTOutputVisitor.java
@@ -68,6 +68,7 @@ import com.alibaba.druid.sql.ast.statement.SQLInsertStatement;
 import com.alibaba.druid.sql.ast.statement.SQLInsertStatement.ValuesClause;
 import com.alibaba.druid.sql.ast.statement.SQLJoinTableSource;
 import com.alibaba.druid.sql.ast.statement.SQLJoinTableSource.JoinType;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddColumn;
 import com.alibaba.druid.sql.ast.statement.SQLSelect;
 import com.alibaba.druid.sql.ast.statement.SQLSelectGroupByClause;
 import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
@@ -1005,4 +1006,16 @@ public class SQLASTOutputVisitor extends SQLASTVisitorAdapter {
         return false;
     }
 
+    @Override
+    public boolean visit(SQLAlterTableAddColumn x) {
+        print("ADD (");
+        printAndAccept(x.getColumns(), ", ");
+        print(")");
+        return false;
+    }
+
+    @Override
+    public void endVisit(SQLAlterTableAddColumn x) {
+
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitor.java b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitor.java
index 60ffbd1344..54cd4b89db 100644
--- a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitor.java
@@ -51,6 +51,7 @@ import com.alibaba.druid.sql.ast.expr.SQLSomeExpr;
 import com.alibaba.druid.sql.ast.expr.SQLUnaryExpr;
 import com.alibaba.druid.sql.ast.expr.SQLVariantRefExpr;
 import com.alibaba.druid.sql.ast.statement.NotNullConstraint;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddColumn;
 import com.alibaba.druid.sql.ast.statement.SQLAssignItem;
 import com.alibaba.druid.sql.ast.statement.SQLCallStatement;
 import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
@@ -336,4 +337,7 @@ public interface SQLASTVisitor {
     
     boolean visit(SQLUseStatement x);
 
+    boolean visit(SQLAlterTableAddColumn x);
+
+    void endVisit(SQLAlterTableAddColumn x);
 }
diff --git a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitorAdapter.java b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitorAdapter.java
index d37f7a3abe..8d9a6de033 100644
--- a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitorAdapter.java
+++ b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitorAdapter.java
@@ -62,6 +62,7 @@ import com.alibaba.druid.sql.ast.statement.SQLDropTableStatement;
 import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
 import com.alibaba.druid.sql.ast.statement.SQLInsertStatement;
 import com.alibaba.druid.sql.ast.statement.SQLInsertStatement.ValuesClause;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddColumn;
 import com.alibaba.druid.sql.ast.statement.SQLJoinTableSource;
 import com.alibaba.druid.sql.ast.statement.SQLSelect;
 import com.alibaba.druid.sql.ast.statement.SQLSelectGroupByClause;
@@ -585,4 +586,13 @@ public class SQLASTVisitorAdapter implements SQLASTVisitor {
         return true;
     }
 
+    @Override
+    public boolean visit(SQLAlterTableAddColumn x) {
+        return true;
+    }
+
+    @Override
+    public void endVisit(SQLAlterTableAddColumn x) {
+
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/visitor/SchemaStatVisitor.java b/src/main/java/com/alibaba/druid/sql/visitor/SchemaStatVisitor.java
index fcabbc2f11..500a4e2ddb 100644
--- a/src/main/java/com/alibaba/druid/sql/visitor/SchemaStatVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/visitor/SchemaStatVisitor.java
@@ -21,6 +21,8 @@ import com.alibaba.druid.sql.ast.expr.SQLInSubQueryExpr;
 import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
 import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
 import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableAddColumn;
+import com.alibaba.druid.sql.ast.statement.SQLAlterTableStatement;
 import com.alibaba.druid.sql.ast.statement.SQLCallStatement;
 import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
 import com.alibaba.druid.sql.ast.statement.SQLCommentStatement;
@@ -899,4 +901,21 @@ public class SchemaStatVisitor extends SQLASTVisitorAdapter {
     public boolean visit(SQLCurrentOfCursorExpr x) {
         return false;
     }
+    
+    @Override
+    public boolean visit(SQLAlterTableAddColumn x) {
+        SQLAlterTableStatement stmt = (SQLAlterTableStatement) x.getParent();
+        String table = stmt.getName().toString();
+
+        for (SQLColumnDefinition column : x.getColumns()) {
+            String columnName = column.getName().toString();
+            addColumn(table, columnName);
+        }
+        return false;
+    }
+
+    @Override
+    public void endVisit(SQLAlterTableAddColumn x) {
+
+    }
 }