diff --git a/crates/squawk_syntax/src/ast/generated/nodes.rs b/crates/squawk_syntax/src/ast/generated/nodes.rs
index 2a3ed469..be44131f 100644
--- a/crates/squawk_syntax/src/ast/generated/nodes.rs
+++ b/crates/squawk_syntax/src/ast/generated/nodes.rs
@@ -7733,6 +7733,10 @@ impl ParenExpr {
         support::child(&self.syntax)
     }
     #[inline]
+    pub fn select(&self) -> Option<Select> {
+        support::child(&self.syntax)
+    }
+    #[inline]
     pub fn l_paren_token(&self) -> Option<SyntaxToken> {
         support::token(&self.syntax, SyntaxKind::L_PAREN)
     }
@@ -10591,6 +10595,10 @@ pub enum Expr {
     IndexExpr(IndexExpr),
     Literal(Literal),
     NameRef(NameRef),
+    ParenExpr(ParenExpr),
+    PostfixExpr(PostfixExpr),
+    PrefixExpr(PrefixExpr),
+    TupleExpr(TupleExpr),
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
@@ -20986,6 +20994,10 @@ impl AstNode for Expr {
                 | SyntaxKind::INDEX_EXPR
                 | SyntaxKind::LITERAL
                 | SyntaxKind::NAME_REF
+                | SyntaxKind::PAREN_EXPR
+                | SyntaxKind::POSTFIX_EXPR
+                | SyntaxKind::PREFIX_EXPR
+                | SyntaxKind::TUPLE_EXPR
         )
     }
     #[inline]
@@ -21001,6 +21013,10 @@ impl AstNode for Expr {
             SyntaxKind::INDEX_EXPR => Expr::IndexExpr(IndexExpr { syntax }),
             SyntaxKind::LITERAL => Expr::Literal(Literal { syntax }),
             SyntaxKind::NAME_REF => Expr::NameRef(NameRef { syntax }),
+            SyntaxKind::PAREN_EXPR => Expr::ParenExpr(ParenExpr { syntax }),
+            SyntaxKind::POSTFIX_EXPR => Expr::PostfixExpr(PostfixExpr { syntax }),
+            SyntaxKind::PREFIX_EXPR => Expr::PrefixExpr(PrefixExpr { syntax }),
+            SyntaxKind::TUPLE_EXPR => Expr::TupleExpr(TupleExpr { syntax }),
             _ => {
                 return None;
             }
@@ -21020,6 +21036,10 @@ impl AstNode for Expr {
             Expr::IndexExpr(it) => &it.syntax,
             Expr::Literal(it) => &it.syntax,
             Expr::NameRef(it) => &it.syntax,
+            Expr::ParenExpr(it) => &it.syntax,
+            Expr::PostfixExpr(it) => &it.syntax,
+            Expr::PrefixExpr(it) => &it.syntax,
+            Expr::TupleExpr(it) => &it.syntax,
         }
     }
 }
@@ -21083,6 +21103,30 @@ impl From<NameRef> for Expr {
         Expr::NameRef(node)
     }
 }
+impl From<ParenExpr> for Expr {
+    #[inline]
+    fn from(node: ParenExpr) -> Expr {
+        Expr::ParenExpr(node)
+    }
+}
+impl From<PostfixExpr> for Expr {
+    #[inline]
+    fn from(node: PostfixExpr) -> Expr {
+        Expr::PostfixExpr(node)
+    }
+}
+impl From<PrefixExpr> for Expr {
+    #[inline]
+    fn from(node: PrefixExpr) -> Expr {
+        Expr::PrefixExpr(node)
+    }
+}
+impl From<TupleExpr> for Expr {
+    #[inline]
+    fn from(node: TupleExpr) -> Expr {
+        Expr::TupleExpr(node)
+    }
+}
 impl AstNode for FuncOption {
     #[inline]
     fn can_cast(kind: SyntaxKind) -> bool {
diff --git a/crates/squawk_syntax/src/postgresql.ungram b/crates/squawk_syntax/src/postgresql.ungram
index 076deb36..9bc8d324 100644
--- a/crates/squawk_syntax/src/postgresql.ungram
+++ b/crates/squawk_syntax/src/postgresql.ungram
@@ -223,6 +223,10 @@ Expr =
 | FieldExpr
 | IndexExpr
 | BetweenExpr
+| ParenExpr
+| TupleExpr
+| PrefixExpr
+| PostfixExpr
 
 ArrayType =
   // int array[]
@@ -1005,7 +1009,7 @@ ReleaseSavepoint =
   'release' 'savepoint' NameRef
 
 ParenExpr =
-  '(' Expr ')'
+  '(' Expr | Select ')'
 
 TupleExpr =
   '(' ')'