diff --git a/.gitignore b/.gitignore
index 1148800..8451cac 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 */materials
-config.json
\ No newline at end of file
+config.json
+homework.xml
\ No newline at end of file
diff --git a/assignment1/homework1.xml b/assignment1/homework1.xml
deleted file mode 100644
index a96e39d..0000000
--- a/assignment1/homework1.xml
+++ /dev/null
@@ -1,176 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-
-
-<homework>
-<item>
-	<id>q1a</id>
-	<question> Count the number of tuples in Inproceedings </question>
-	<sql><![CDATA[
-        SELECT COUNT(*) AS q1a FROM inproceedings;
-	]]></sql>
-    <result>
-        2956396
-    </result>
-</item>
-<item>
-	<id>q1b</id>
-	<question> Count the number of tuples in Article </question>
-	<sql><![CDATA[
-        SELECT COUNT(*) AS q1b FROM article;
-	]]></sql>
-    <result>
-        2738932
-    </result>
-</item>
-<item>
-	<id>q1c</id>
-	<question> Count the number of tuples in Authorship </question>
-	<sql><![CDATA[
-        SELECT COUNT(*) AS q1c FROM authorship;
-	]]></sql>
-    <result>
-        18128940
-    </result>
-</item>
-<item>
-	<id>q2a</id>
-	<question> Add a column "Area" in the Inproceedings table. </question>
-	<sql><![CDATA[
-        ALTER TABLE inproceedings ADD COLUMN area text;
-	]]></sql>
-    <result>
-        Done.
-        []
-    </result>
-</item>
-<item>
-    <id> q2b </id>
-    <question> Populate the column 'Area' with the values from the table if there is a match, otherwise set it to 'UNKNOWN' </question>
-    <sql><![CDATA[
-        UPDATE inproceedings SET area = 'Database' WHERE booktitle IN ('SIGMOD Conference', 'VLDB', 'ICDE', 'PODS');
-        UPDATE inproceedings SET area = 'Theory' WHERE booktitle IN ('STOC', 'FOCS', 'SODA', 'ICALP');
-        UPDATE inproceedings SET area = 'Systems' WHERE booktitle IN ('SIGCOMM', 'ISCA', 'HPCA', 'PLDI');
-        UPDATE inproceedings SET area = 'ML-AI' WHERE booktitle IN ('ICML', 'NIPS', 'NeurIPS', 'AAAI', 'IJCAI');
-        UPDATE inproceedings SET area = 'UNKNOWN' WHERE area IS NULL;
-	]]></sql>
-    <result>
-        13126 rows affected.
-        13758 rows affected.
-        6289 rows affected.
-        43475 rows affected.
-        2879748 rows affected.
-        []
-    </result>
-</item>
-<item>
-    <id>q3a</id>
-    <question>Find the number of authors who published in each area (do not consider UNKNOWN). </question>
-    <sql><![CDATA[
-        SELECT area, COUNT(author) AS cnt FROM inproceedings, authorship 
-        WHERE 
-            inproceedings.pubkey = authorship.pubkey 
-            AND area != 'UNKNOWN'
-        GROUP BY area;
-    ]]></sql>
-    <result>
-        Database 43836
-        ML-AI	143124
-        Systems	23744
-        Theory	33626
-    </result>
-</item>
-<item>
-    <id>q3b</id>
-    <question>Find the top-10 authors who published the most number of ``Database'' papers. </question>
-    <sql><![CDATA[
-        WITH database_authors AS (
-        SELECT authorship.pubkey, author, area FROM inproceedings, authorship
-        WHERE
-            inproceedings.pubkey = authorship.pubkey
-            AND area = 'Database'
-        )
-
-        SELECT author, COUNT(*) as cnt 
-        FROM database_authors 
-        GROUP BY author
-        ORDER BY cnt DESC
-        LIMIT 10; 
-    ]]></sql>
-    <result>
-        Divesh Srivastava	150
-        H. V. Jagadish	127
-        Surajit Chaudhuri	127
-        Jiawei Han 0001	110
-        Philip S. Yu	110
-        Xuemin Lin 0001	109
-        Jeffrey F. Naughton	108
-        Beng Chin Ooi	105
-        Hector Garcia-Molina	104
-        Michael Stonebraker	100
-    </result>
-</item>
-<item>
-	<id>q3c</id>
-	<question>Find the number of authors who published in exactly two of the four areas (do not consider UNKNOWN). </question>
-	<sql><![CDATA[
-        cnt
-        13573
-	]]></sql>
-    <result>
-        WITH area_authors AS (
-            SELECT authorship.pubkey, author, area FROM inproceedings, authorship
-            WHERE 
-                inproceedings.pubkey = authorship.pubkey
-                AND area != 'UNKNOWN'
-        ),
-        area_counts AS (
-            SELECT author, COUNT(area) AS a_cnt FROM area_authors GROUP BY author
-        )
-
-        SELECT COUNT(*) as cnt FROM area_counts WHERE a_cnt = 2;
-    </result>
-</item>
-<item>
-	<id>q3d</id>
-    <question>Find the number of authors who wrote more journal papers than conference papers (irrespective of research areas).</question>
-	<sql><![CDATA[
-        WITH conf_count AS (
-            SELECT authorship.author, COUNT(*) AS ccnt
-            FROM inproceedings, authorship
-            WHERE inproceedings.pubkey = authorship.pubkey
-            GROUP BY authorship.author
-        ),
-        journal_count AS (
-            SELECT authorship.author, COUNT(*) AS jcnt
-            FROM article, authorship
-            WHERE article.pubkey = authorship.pubkey
-            GROUP BY authorship.author 
-        ),
-        combined AS (
-            SELECT journal_count.author, COALESCE(ccnt, 0) AS ccnt, jcnt
-            FROM journal_count
-            LEFT JOIN conf_count ON journal_count.author = conf_count.author
-        )
-
-        SELECT COUNT(*) 
-        FROM combined
-        WHERE jcnt > ccnt
-	]]></sql>
-    <result>
-        1301165
-    </result>
-</item>
-<item>
-	<id>q3e</id>
-    <question>
-    Among the authors who have published at least one “Database” paper (in any year), find the top-5 authors who published the
-    most number of papers (journal OR conference, in any area) since the year 2000 (including the year 2000).
-    </question>
-	<sql><![CDATA[
-        ???
-	]]></sql>
-	<result>
-        ???
-	</result>
-</item>
-</homework>