diff --git a/chat2db-server/chat2db-plugins/chat2db-mysql/src/main/java/ai/chat2db/plugin/mysql/builder/MysqlSqlBuilder.java b/chat2db-server/chat2db-plugins/chat2db-mysql/src/main/java/ai/chat2db/plugin/mysql/builder/MysqlSqlBuilder.java
index 1a97c843..7a2c3830 100644
--- a/chat2db-server/chat2db-plugins/chat2db-mysql/src/main/java/ai/chat2db/plugin/mysql/builder/MysqlSqlBuilder.java
+++ b/chat2db-server/chat2db-plugins/chat2db-mysql/src/main/java/ai/chat2db/plugin/mysql/builder/MysqlSqlBuilder.java
@@ -11,9 +11,7 @@ import ai.chat2db.spi.model.TableIndex;
 import cn.hutool.core.util.ArrayUtil;
 import org.apache.commons.lang3.StringUtils;
 
-import java.util.Arrays;
-import java.util.HashMap;
-import java.util.Map;
+import java.util.*;
 
 
 public class MysqlSqlBuilder extends DefaultSqlBuilder implements SqlBuilder {
@@ -163,6 +161,12 @@ public class MysqlSqlBuilder extends DefaultSqlBuilder implements SqlBuilder {
         String[] oldColumnArray = oldTable.getColumnList().stream().map(TableColumn::getName).toArray(String[]::new);
         String[] newColumnArray = newTable.getColumnList().stream().map(TableColumn::getName).toArray(String[]::new);
 
+        Set<String> oldColumnSet = new HashSet<>(Arrays.asList(oldColumnArray));
+        Set<String> newColumnSet = new HashSet<>(Arrays.asList(newColumnArray));
+        if (!oldColumnSet.equals(newColumnSet)) {
+            return "";
+        }
+
         buildSql(oldColumnArray, newColumnArray, sql, oldTable, newTable, n);
 
         return sql.toString();