diff --git a/src/binder/expr.rs b/src/binder/expr.rs
index b021c904..f35a4afa 100644
--- a/src/binder/expr.rs
+++ b/src/binder/expr.rs
@@ -110,22 +110,21 @@ impl<'a, T: Transaction> Binder<'a, T> {
             }),
             Expr::Subquery(subquery) => {
                 let (sub_query, column) = self.bind_subquery(subquery)?;
-                self.context.sub_query(SubQueryType::SubQuery(sub_query));
-
-                if self.context.is_step(&QueryBindStep::Where) {
-                    Ok(self.bind_temp_column(column))
+                let (expr, sub_query) = if self.context.is_step(&QueryBindStep::Where) {
+                    self.bind_temp_table(column, sub_query)?
                 } else {
-                    Ok(ScalarExpression::ColumnRef(column))
-                }
+                    (ScalarExpression::ColumnRef(column), sub_query)
+                };
+                self.context.sub_query(SubQueryType::SubQuery(sub_query));
+                Ok(expr)
             }
             Expr::InSubquery {
                 expr,
                 subquery,
                 negated,
             } => {
+                let left_expr = Box::new(self.bind_expr(expr)?);
                 let (sub_query, column) = self.bind_subquery(subquery)?;
-                self.context
-                    .sub_query(SubQueryType::InSubQuery(*negated, sub_query));
 
                 if !self.context.is_step(&QueryBindStep::Where) {
                     return Err(DatabaseError::UnsupportedStmt(
@@ -133,11 +132,13 @@ impl<'a, T: Transaction> Binder<'a, T> {
                     ));
                 }
 
-                let alias_expr = self.bind_temp_column(column);
+                let (alias_expr, sub_query) = self.bind_temp_table(column, sub_query)?;
+                self.context
+                    .sub_query(SubQueryType::InSubQuery(*negated, sub_query));
 
                 Ok(ScalarExpression::Binary {
                     op: expression::BinaryOperator::Eq,
-                    left_expr: Box::new(self.bind_expr(expr)?),
+                    left_expr,
                     right_expr: Box::new(alias_expr),
                     ty: LogicalType::Boolean,
                 })
@@ -203,16 +204,22 @@ impl<'a, T: Transaction> Binder<'a, T> {
         }
     }
 
-    fn bind_temp_column(&mut self, column: ColumnRef) -> ScalarExpression {
+    fn bind_temp_table(
+        &mut self,
+        column: ColumnRef,
+        sub_query: LogicalPlan,
+    ) -> Result<(ScalarExpression, LogicalPlan), DatabaseError> {
         let mut alias_column = ColumnCatalog::clone(&column);
         alias_column.set_table_name(self.context.temp_table());
 
-        ScalarExpression::Alias {
+        let alias_expr = ScalarExpression::Alias {
             expr: Box::new(ScalarExpression::ColumnRef(column)),
             alias: AliasType::Expr(Box::new(ScalarExpression::ColumnRef(Arc::new(
                 alias_column,
             )))),
-        }
+        };
+        let alias_plan = self.bind_project(sub_query, vec![alias_expr.clone()])?;
+        Ok((alias_expr, alias_plan))
     }
 
     fn bind_subquery(
@@ -289,7 +296,7 @@ impl<'a, T: Transaction> Binder<'a, T> {
         } else {
             // handle col syntax
             let mut got_column = None;
-            for table_catalog in self.context.bind_table.values() {
+            for table_catalog in self.context.bind_table.values().rev() {
                 if let Some(column_catalog) = table_catalog.get_column_by_name(&column_name) {
                     got_column = Some(column_catalog);
                 }
diff --git a/src/binder/select.rs b/src/binder/select.rs
index 7e2da9d7..0832fb74 100644
--- a/src/binder/select.rs
+++ b/src/binder/select.rs
@@ -76,7 +76,7 @@ impl<'a, T: Transaction> Binder<'a, T> {
         // Resolve scalar function call.
         // TODO support SRF(Set-Returning Function).
 
-        let mut select_list = self.normalize_select_item(&select.projection)?;
+        let mut select_list = self.normalize_select_item(&select.projection, &plan)?;
 
         if let Some(predicate) = &select.selection {
             plan = self.bind_where(plan, predicate)?;
@@ -341,6 +341,7 @@ impl<'a, T: Transaction> Binder<'a, T> {
     fn normalize_select_item(
         &mut self,
         items: &[SelectItem],
+        plan: &LogicalPlan,
     ) -> Result<Vec<ScalarExpression>, DatabaseError> {
         let mut select_items = vec![];
 
@@ -359,6 +360,9 @@ impl<'a, T: Transaction> Binder<'a, T> {
                     });
                 }
                 SelectItem::Wildcard(_) => {
+                    if let Operator::Project(op) = &plan.operator {
+                        return Ok(op.exprs.clone());
+                    }
                     for (table_name, _) in self.context.bind_table.keys() {
                         self.bind_table_column_refs(&mut select_items, table_name.clone())?;
                     }
@@ -510,7 +514,7 @@ impl<'a, T: Transaction> Binder<'a, T> {
         Ok(FilterOperator::build(having, children, true))
     }
 
-    fn bind_project(
+    pub(crate) fn bind_project(
         &mut self,
         children: LogicalPlan,
         select_list: Vec<ScalarExpression>,
diff --git a/src/expression/mod.rs b/src/expression/mod.rs
index 7c9cb659..78672a4c 100644
--- a/src/expression/mod.rs
+++ b/src/expression/mod.rs
@@ -121,7 +121,13 @@ pub enum ScalarExpression {
 
 impl ScalarExpression {
     pub fn unpack_alias(self) -> ScalarExpression {
-        if let ScalarExpression::Alias { expr, .. } = self {
+        if let ScalarExpression::Alias {
+            alias: AliasType::Expr(expr),
+            ..
+        } = self
+        {
+            expr.unpack_alias()
+        } else if let ScalarExpression::Alias { expr, .. } = self {
             expr.unpack_alias()
         } else {
             self
@@ -129,7 +135,13 @@ impl ScalarExpression {
     }
 
     pub fn unpack_alias_ref(&self) -> &ScalarExpression {
-        if let ScalarExpression::Alias { expr, .. } = self {
+        if let ScalarExpression::Alias {
+            alias: AliasType::Expr(expr),
+            ..
+        } = self
+        {
+            expr.unpack_alias_ref()
+        } else if let ScalarExpression::Alias { expr, .. } = self {
             expr.unpack_alias_ref()
         } else {
             self
@@ -137,7 +149,7 @@ impl ScalarExpression {
     }
 
     pub fn try_reference(&mut self, output_exprs: &[ScalarExpression]) {
-        let fn_output_column = |expr: &ScalarExpression| expr.unpack_alias_ref().output_column();
+        let fn_output_column = |expr: &ScalarExpression| expr.output_column();
         let self_column = fn_output_column(self);
         if let Some((pos, _)) = output_exprs
             .iter()
diff --git a/src/optimizer/rule/normalization/combine_operators.rs b/src/optimizer/rule/normalization/combine_operators.rs
index 785b3106..2b59760b 100644
--- a/src/optimizer/rule/normalization/combine_operators.rs
+++ b/src/optimizer/rule/normalization/combine_operators.rs
@@ -61,8 +61,6 @@ impl NormalizationRule for CollapseProject {
                 if let Operator::Project(child_op) = graph.operator(child_id) {
                     if is_subset_exprs(&op.exprs, &child_op.exprs) {
                         graph.remove_node(child_id, false);
-                    } else {
-                        graph.remove_node(node_id, false);
                     }
                 }
             }