diff --git a/sqlTranslate/.idea/workspace.xml b/sqlTranslate/.idea/workspace.xml
index 02dd6433e..84a3005ad 100644
--- a/sqlTranslate/.idea/workspace.xml
+++ b/sqlTranslate/.idea/workspace.xml
@@ -4,8 +4,8 @@
     <option name="autoReloadType" value="SELECTIVE" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="d8d12963-4777-48e3-9669-309cf5e41d60" name="更改" comment="add alter table grammar document">
-      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/AlterTable/AlterNode.java" afterDir="false" />
+    <list default="true" id="d8d12963-4777-48e3-9669-309cf5e41d60" name="更改" comment="add alter table ast class">
+      <change beforePath="$PROJECT_DIR$/src/main/java/Lexer/OracleLexer.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/Lexer/OracleLexer.java" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -439,7 +439,14 @@
       <option name="project" value="LOCAL" />
       <updated>1726153173228</updated>
     </task>
-    <option name="localTasksCounter" value="49" />
+    <task id="LOCAL-00049" summary="add alter table ast class">
+      <created>1726153977485</created>
+      <option name="number" value="00049" />
+      <option name="presentableId" value="LOCAL-00049" />
+      <option name="project" value="LOCAL" />
+      <updated>1726153977485</updated>
+    </task>
+    <option name="localTasksCounter" value="50" />
     <servers />
   </component>
   <component name="Vcs.Log.Tabs.Properties">
@@ -454,7 +461,6 @@
     </option>
   </component>
   <component name="VcsManagerConfiguration">
-    <MESSAGE value="add AST node" />
     <MESSAGE value="add functions" />
     <MESSAGE value="add parser function" />
     <MESSAGE value="add function" />
@@ -479,7 +485,8 @@
     <MESSAGE value="add Delete ast class" />
     <MESSAGE value="add Delete" />
     <MESSAGE value="add alter table grammar document" />
-    <option name="LAST_COMMIT_MESSAGE" value="add alter table grammar document" />
+    <MESSAGE value="add alter table ast class" />
+    <option name="LAST_COMMIT_MESSAGE" value="add alter table ast class" />
   </component>
   <component name="XDebuggerManager">
     <watches-manager>
diff --git a/sqlTranslate/src/main/java/Lexer/OracleLexer.java b/sqlTranslate/src/main/java/Lexer/OracleLexer.java
index 39e2987c2..c45153568 100644
--- a/sqlTranslate/src/main/java/Lexer/OracleLexer.java
+++ b/sqlTranslate/src/main/java/Lexer/OracleLexer.java
@@ -16,13 +16,15 @@ public class OracleLexer {
             "LONG RAW", "BOOLEAN", "INTERVAL YEAR TO MONTH", "INTERVAL DAY TO SECOND", "ROWID", "UROWID", "REF CURSOR",
             "NOT NULL", "PRIMARY KEY", "UNIQUE", "CHECK", "REFERENCES", "DEFAULT", "CONSTRAINT", "FOREIGN KEY"
             // keywords of drop table
-            , "DROP", "CASCADE", "CONSTRAINTS"
+            , "DROP", "CASCADE"
             // keywords of select
             , "DISTINCT", "JOIN", "GROUP BY", "ORDER BY", "HAVING", "UNION", "CASE", "WHEN", "END", "AS"
             // keywords of join
             , "INNER JOIN", "LEFT JOIN", "LEFT OUTER JOIN", "RIGHT JOIN", "RIGHT OUTER JOIN", "FULL JOIN", "FULL OUTER JOIN", "CROSS JOIN", "JOIN", "ON", "USING"
             // keywords of update
             , "SET"
+            // keywords of alter table
+            , "ALTER", "ADD", "DROP", "MODIFY", "RENAME", "TO"
     };
     private static final Pattern TOKEN_PATTERN = Pattern.compile(
             "(NUMBER\\(.*?\\))|" +                     // NUMBER() function