diff --git a/11.sql b/11.sql
index 648221d..f5732b7 100644
--- a/11.sql
+++ b/11.sql
@@ -3,5 +3,5 @@ FROM movies
 JOIN ratings ON movies.id = ratings.movie_id
 JOIN stars ON movies.id = stars.movie_id
 JOIN people ON stars.person_id = people.id
-WHERE name = "Chadwick Boseman"
+WHERE name = 'Chadwick Boseman'
 ORDER BY rating DESC LIMIT 5;
diff --git a/12.sql b/12.sql
index 24bc945..80cef2c 100644
--- a/12.sql
+++ b/12.sql
@@ -1,20 +1,6 @@
-SELECT title
-FROM movies
-WHERE id IN (
-    SELECT movie_id
-    FROM stars
-    WHERE person_id IN (
-         SELECT id
-         FROM people
-         WHERE name LIKE "Bradley Cooper"
-    )
-    )
-AND id IN (
-    SELECT movie_id
-    FROM stars
-    WHERE person_id IN (
-         SELECT id
-         FROM people
-         WHERE name LIKE "Bradley Cooper"
-    )
-);
+SELECT movies.title FROM stars
+JOIN movies ON stars.movie_id = movies.id
+JOIN people ON stars.person_id = people.id
+WHERE people.name IN ('Bradley Cooper', 'Jennifer Lawrence')
+GROUP BY movies.title
+HAVING COUNT(movies.title) = 2;
diff --git a/13.sql b/13.sql
index 82453c4..4da8a02 100644
--- a/13.sql
+++ b/13.sql
@@ -1,9 +1,9 @@
 SELECT DISTINCT(name)
 FROM people
-WHERE name IS NOT "Kevin Bacon" AND id IN(
+WHERE name IS NOT 'Kevin Bacon' AND id IN(
     SELECT person_id FROM stars WHERE movie_id IN(
         SELECT movie_id FROM stars WHERE person_id IN(
-            SELECT id FROM people WHERE name IS "Kevin Bacon" and birth = 1958
+            SELECT id FROM people WHERE name IS 'Kevin Bacon' and birth = 1958
         )
     )
 )