diff --git a/sqlTranslate/.idea/workspace.xml b/sqlTranslate/.idea/workspace.xml
index 859aff4d..fb9ca0c3 100644
--- a/sqlTranslate/.idea/workspace.xml
+++ b/sqlTranslate/.idea/workspace.xml
@@ -5,17 +5,15 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" id="d8d12963-4777-48e3-9669-309cf5e41d60" name="更改" comment="add todolist">
-      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/DropTable/DropTableEndNode.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/DropTable/DropTableNameNode.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/DropTable/DropTableNode.java" afterDir="false" />
-      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/DropTable/DropTableOptionNode.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/Select/SelectEndNode.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/Select/SelectNode.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/Select/SelectObjNode.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/Select/SelectOptionNode.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/Select/SelectTableNode.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/Select/SelectUnionNode.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/Select/SelectWhereClauseNode.java" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
       <change beforePath="$PROJECT_DIR$/src/main/java/Document/Todolist" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/Document/Todolist" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/Generator/OpenGaussGenerator.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/Generator/OpenGaussGenerator.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/Lexer/OracleLexer.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/Lexer/OracleLexer.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/Main.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/Main.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/Parser/AST/ASTNode.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/Parser/AST/ASTNode.java" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/Parser/OracleParser.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/Parser/OracleParser.java" afterDir="false" />
     </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
@@ -274,7 +272,14 @@
       <option name="project" value="LOCAL" />
       <updated>1725890826442</updated>
     </task>
-    <option name="localTasksCounter" value="24" />
+    <task id="LOCAL-00024" summary="add todolist">
+      <created>1725896687932</created>
+      <option name="number" value="00024" />
+      <option name="presentableId" value="LOCAL-00024" />
+      <option name="project" value="LOCAL" />
+      <updated>1725896687932</updated>
+    </task>
+    <option name="localTasksCounter" value="25" />
     <servers />
   </component>
   <component name="Vcs.Log.Tabs.Properties">
diff --git a/sqlTranslate/src/main/java/Document/Todolist b/sqlTranslate/src/main/java/Document/Todolist
index cbb370f7..e5bafb05 100644
--- a/sqlTranslate/src/main/java/Document/Todolist
+++ b/sqlTranslate/src/main/java/Document/Todolist
@@ -1,9 +1,9 @@
 Operation
- select.. from.. where
- join
- group by
- order by
- union
+ select.. from.. where 1
+ join 1
+ group by 1
+ order by 1
+ union 1
  insert into 1
  update... set
  delete
@@ -20,7 +20,7 @@ Operation
  create table 1
  drop table 1
 Object
- table
+ table 1
  view
  function
  procedure
diff --git a/sqlTranslate/src/main/java/Parser/AST/Select/SelectEndNode.java b/sqlTranslate/src/main/java/Parser/AST/Select/SelectEndNode.java
new file mode 100644
index 00000000..3db2798f
--- /dev/null
+++ b/sqlTranslate/src/main/java/Parser/AST/Select/SelectEndNode.java
@@ -0,0 +1,28 @@
+package Parser.AST.Select;
+
+import Lexer.Token;
+import Parser.AST.ASTNode;
+
+import java.util.List;
+
+public class SelectEndNode extends ASTNode {
+    public SelectEndNode(List<Token> tokens)
+    {
+        super(tokens);
+    }
+
+    public SelectEndNode(ASTNode node)
+    {
+        super(node);
+    }
+
+    @Override
+    public void visit(ASTNode node, StringBuilder queryString)
+    {
+        queryString.append(toString());
+        for (ASTNode child : getChildren())
+        {
+            child.visit(child, queryString);
+        }
+    }
+}
diff --git a/sqlTranslate/src/main/java/Parser/AST/Select/SelectNode.java b/sqlTranslate/src/main/java/Parser/AST/Select/SelectNode.java
new file mode 100644
index 00000000..a56ade48
--- /dev/null
+++ b/sqlTranslate/src/main/java/Parser/AST/Select/SelectNode.java
@@ -0,0 +1,29 @@
+package Parser.AST.Select;
+
+import Parser.AST.ASTNode;
+import Lexer.Token;
+
+import java.util.List;
+
+public class SelectNode extends ASTNode {
+    public SelectNode(List<Token> tokens)
+    {
+        super(tokens);
+    }
+
+    public SelectNode(ASTNode node)
+    {
+        super(node);
+    }
+
+    @Override
+    public void visit(ASTNode node, StringBuilder queryString)
+    {
+        queryString.append(toString() + " ");
+        for (ASTNode child : getChildren())
+        {
+            child.visit(child, queryString);
+        }
+    }
+
+}
diff --git a/sqlTranslate/src/main/java/Parser/AST/Select/SelectObjNode.java b/sqlTranslate/src/main/java/Parser/AST/Select/SelectObjNode.java
new file mode 100644
index 00000000..3ceb5140
--- /dev/null
+++ b/sqlTranslate/src/main/java/Parser/AST/Select/SelectObjNode.java
@@ -0,0 +1,42 @@
+package Parser.AST.Select;
+
+import Lexer.Token;
+import Parser.AST.ASTNode;
+
+import java.util.List;
+
+public class SelectObjNode extends ASTNode {
+    public SelectObjNode(List<Token> tokens)
+    {
+        super(tokens);
+    }
+
+    public SelectObjNode(ASTNode node)
+    {
+        super(node);
+    }
+
+    @Override
+    public String toString()
+    {
+        List<Token> tokens = getTokens();
+        String str = "";
+        for (int i = 0; i < tokens.size(); i++) {
+            if (i < tokens.size() - 1)
+                str += tokens.get(i).getValue() + ", ";
+            else
+                str += tokens.get(i).getValue();
+        }
+        return str;
+    }
+
+    @Override
+    public void visit(ASTNode node, StringBuilder queryString)
+    {
+        queryString.append(toString() + " FROM ");
+        for (ASTNode child : getChildren())
+        {
+            child.visit(child, queryString);
+        }
+    }
+}
diff --git a/sqlTranslate/src/main/java/Parser/AST/Select/SelectOptionNode.java b/sqlTranslate/src/main/java/Parser/AST/Select/SelectOptionNode.java
new file mode 100644
index 00000000..a70b71e9
--- /dev/null
+++ b/sqlTranslate/src/main/java/Parser/AST/Select/SelectOptionNode.java
@@ -0,0 +1,28 @@
+package Parser.AST.Select;
+
+import Lexer.Token;
+import Parser.AST.ASTNode;
+
+import java.util.List;
+
+public class SelectOptionNode extends ASTNode {
+    public SelectOptionNode(List<Token> tokens)
+    {
+        super(tokens);
+    }
+
+    public SelectOptionNode(ASTNode node)
+    {
+        super(node);
+    }
+
+    @Override
+    public void visit(ASTNode node, StringBuilder queryString)
+    {
+        queryString.append(toString() + " ");
+        for (ASTNode child : getChildren())
+        {
+            child.visit(child, queryString);
+        }
+    }
+}
diff --git a/sqlTranslate/src/main/java/Parser/AST/Select/SelectTableNode.java b/sqlTranslate/src/main/java/Parser/AST/Select/SelectTableNode.java
new file mode 100644
index 00000000..86c7ae51
--- /dev/null
+++ b/sqlTranslate/src/main/java/Parser/AST/Select/SelectTableNode.java
@@ -0,0 +1,27 @@
+package Parser.AST.Select;
+
+import Lexer.Token;
+import Parser.AST.ASTNode;
+
+import java.util.List;
+
+public class SelectTableNode extends ASTNode {
+    public SelectTableNode(List<Token> tokens)
+    {
+        super(tokens);
+    }
+
+    public SelectTableNode(ASTNode node)
+    {
+        super(node);
+    }
+
+    public void visit(ASTNode node, StringBuilder queryString)
+    {
+        queryString.append(toString() + " ");
+        for (ASTNode child : getChildren())
+        {
+            child.visit(child, queryString);
+        }
+    }
+}
diff --git a/sqlTranslate/src/main/java/Parser/AST/Select/SelectUnionNode.java b/sqlTranslate/src/main/java/Parser/AST/Select/SelectUnionNode.java
new file mode 100644
index 00000000..762c5526
--- /dev/null
+++ b/sqlTranslate/src/main/java/Parser/AST/Select/SelectUnionNode.java
@@ -0,0 +1,28 @@
+package Parser.AST.Select;
+
+import Lexer.Token;
+import Parser.AST.ASTNode;
+
+import java.util.List;
+
+public class SelectUnionNode extends ASTNode {
+    public SelectUnionNode(List<Token> tokens)
+    {
+        super(tokens);
+    }
+
+    public SelectUnionNode(ASTNode node)
+    {
+        super(node);
+    }
+
+    @Override
+    public void visit(ASTNode node, StringBuilder queryString)
+    {
+        queryString.append(toString() + " ");
+        for (ASTNode child : getChildren())
+        {
+            child.visit(child, queryString);
+        }
+    }
+}
diff --git a/sqlTranslate/src/main/java/Parser/AST/Select/SelectWhereClauseNode.java b/sqlTranslate/src/main/java/Parser/AST/Select/SelectWhereClauseNode.java
new file mode 100644
index 00000000..b1f6a0a1
--- /dev/null
+++ b/sqlTranslate/src/main/java/Parser/AST/Select/SelectWhereClauseNode.java
@@ -0,0 +1,28 @@
+package Parser.AST.Select;
+
+import Lexer.Token;
+import Parser.AST.ASTNode;
+
+import java.util.List;
+
+public class SelectWhereClauseNode extends ASTNode {
+    public SelectWhereClauseNode(List<Token> tokens)
+    {
+        super(tokens);
+    }
+
+    public SelectWhereClauseNode(ASTNode node)
+    {
+        super(node);
+    }
+
+    @Override
+    public void visit(ASTNode node, StringBuilder queryString)
+    {
+        queryString.append(toString() + " ");
+        for (ASTNode child : getChildren())
+        {
+            child.visit(child, queryString);
+        }
+    }
+}