diff --git a/src/parser/bison_parser.y b/src/parser/bison_parser.y
index 08ebaf9..2e32ca4 100644
--- a/src/parser/bison_parser.y
+++ b/src/parser/bison_parser.y
@@ -661,12 +661,11 @@ logic_expr:
 	|	expr OR expr	{ $$ = Expr::makeOpBinary($1, Expr::OR, $3); }
 	;
 
-// TODO:
 in_expr:
-		operand IN '(' expr_list ')'			{ $$ = Expr::makeInOperator($1, $4, false); }
-	|	operand NOT IN '(' expr_list ')'		{ $$ = Expr::makeInOperator($1, $5, true); }
-	|	operand IN '(' select_no_paren ')'		{ $$ = Expr::makeInOperator($1, $4, false); }
-	|	operand NOT IN '(' select_no_paren ')'	{ $$ = Expr::makeInOperator($1, $5, true); }
+		operand IN '(' expr_list ')'			{ $$ = Expr::makeInOperator($1, $4); }
+	|	operand NOT IN '(' expr_list ')'		{ $$ = Expr::makeOpUnary(Expr::NOT, Expr::makeInOperator($1, $5)); }
+	|	operand IN '(' select_no_paren ')'		{ $$ = Expr::makeInOperator($1, $4); }
+	|	operand NOT IN '(' select_no_paren ')'	{ $$ = Expr::makeOpUnary(Expr::NOT, Expr::makeInOperator($1, $5)); }
 	;
 
 // TODO: allow no else specified
@@ -676,6 +675,7 @@ case_expr:
 
 exists_expr:
 		EXISTS '(' select_no_paren ')' { $$ = Expr::makeExists($3); }
+	|	NOT EXISTS '(' select_no_paren ')' { $$ = Expr::makeOpUnary(Expr::NOT, Expr::makeExists($4)); }
 	;
 
 comp_expr:
diff --git a/src/sql/Expr.cpp b/src/sql/Expr.cpp
index 2deb8c6..a4d4c80 100644
--- a/src/sql/Expr.cpp
+++ b/src/sql/Expr.cpp
@@ -137,37 +137,21 @@ namespace hsql {
     return e;
   }
 
-  Expr* Expr::makeInOperator(Expr* expr, std::vector<Expr*>* exprList, bool notIn) {
+  Expr* Expr::makeInOperator(Expr* expr, std::vector<Expr*>* exprList) {
     Expr* e = new Expr(kExprOperator);
     e->opType = IN;
     e->expr = expr;
     e->exprList = exprList;
 
-    // If it is NOT IN, wrap the IN in a NOT operator.
-    if (notIn) {
-      Expr* neg = new Expr(kExprOperator);
-      neg->opType = NOT;
-      neg->expr = e;
-      return neg;
-    }
-
     return e;
   }
 
-  Expr* Expr::makeInOperator(Expr* expr, SelectStatement* select, bool notIn) {
+  Expr* Expr::makeInOperator(Expr* expr, SelectStatement* select) {
     Expr* e = new Expr(kExprOperator);
     e->opType = IN;
     e->expr = expr;
     e->select = select;
-
-    // If it is NOT IN, wrap the IN in a NOT operator.
-    if (notIn) {
-      Expr* neg = new Expr(kExprOperator);
-      neg->opType = NOT;
-      neg->expr = e;
-      return neg;
-    }
-
+    
     return e;
   }
 
diff --git a/src/sql/Expr.h b/src/sql/Expr.h
index 4bbd435..3284802 100644
--- a/src/sql/Expr.h
+++ b/src/sql/Expr.h
@@ -133,9 +133,9 @@ namespace hsql {
 
     static Expr* makeExists(SelectStatement* select);
 
-    static Expr* makeInOperator(Expr* expr, std::vector<Expr*>* exprList, bool notIn);
+    static Expr* makeInOperator(Expr* expr, std::vector<Expr*>* exprList);
 
-    static Expr* makeInOperator(Expr* expr, SelectStatement* select, bool notIn);
+    static Expr* makeInOperator(Expr* expr, SelectStatement* select);
   };
 
 // Zero initializes an Expr object and assigns it to a space in the heap