diff --git a/politicians.csv b/politicians.csv
new file mode 100644
index 0000000..9cd6217
--- /dev/null
+++ b/politicians.csv
@@ -0,0 +1,21 @@
+name,party,location,grade_current
+Aaron Schock,R,IL,11.5362423
+Adam Kinzinger,R,IL,8.995621754
+Adam Schiff,D,LA,13.0347375
+Adam Smith,D,WA,10.23695519
+Anna Eshoo,D,WA,10.65351543
+Bill Cassidy,R,LA,9.285165569
+Candice Miller,R,WA,11.70865922
+Carolyn Maloney,D,NY,13.03522892
+Dana Rohrabacher,R,NY,10.64634133
+Duncan Hunter,R,IL,13.66509733
+Erik Paulsen,R,LA,11.69134788
+Frank Guinta,R,HI,10.94131093
+Frank LoBiondo,R,HI,13.08452404
+John Kerry,D,LA,11.01029616
+Joseph Lieberman,I,NY,7.95536381
+Michael Bennet,D,IL,7.98091322
+Olympia Snowe,R,WA,13.80125838
+Richard Shelby,R,HI,11.31326157
+Yvette Clarke,D,NY,12.45211362
+Zoe Lofgren,D,HI,12.76643582
diff --git a/poll-db.txt b/poll-db.txt
new file mode 100644
index 0000000..e69de29
diff --git a/poll.db b/poll.db
new file mode 100644
index 0000000..58b3447
Binary files /dev/null and b/poll.db differ
diff --git a/poll.md b/poll.md
new file mode 100644
index 0000000..9dd4532
--- /dev/null
+++ b/poll.md
@@ -0,0 +1,23 @@
+<!-- Release 1  -->
+
+<!-- 1. Hitung jumlah vote untuk Sen. Olympia Snowe yang memiliki id 524. -->
+
+<!-- 2. Sekarang lakukan JOIN tanpa menggunakan id `524`. Query kedua tabel votes dan congress_members. -->
+
+<!-- 3. Sekarang gimana dengan representative Erik Paulsen? Berapa banyak vote yang dia dapatkan? -->
+
+<!-- 4. Buatlah daftar peserta Congress yang mendapatkan vote terbanyak. Jangan sertakan field `created_at` dan `updated_at`. -->
+
+<!-- 5. Sekarang buatlah sebuah daftar semua anggota Congress yang setidaknya mendapatkan beberapa vote dalam urutan dari yang paling sedikit. Dan juga jangan sertakan field-field yang memiliki tipe date. -->
+
+<!-- Release 2  -->
+
+<!-- 1. Siapa anggota Congress yang mendapatkan vote terbanyak? List nama mereka dan jumlah vote-nya. Siapa saja yang memilih politisi tersebut? List nama mereka, dan jenis kelamin mereka. -->
+
+<!-- 2. Berapa banyak vote yang diterima anggota Congress yang memiliki grade di bawah 9 (gunakan field `grade_current`)? Ambil nama, lokasi, grade_current dan jumlah vote. -->
+
+<!-- 3. Apa saja 10 negara bagian yang memiliki voters terbanyak? List semua orang yang melakukan vote di negara bagian yang paling populer. (Akan menjadi daftar yang panjang, kamu bisa gunakan hasil dari query pertama untuk menyederhanakan query berikut ini.) -->
+
+<!-- 4. List orang-orang yang vote lebih dari dua kali. Harusnya mereka hanya bisa vote untuk posisi Senator dan satu lagi untuk wakil. Wow, kita dapat si tukang curang! Segera laporkan ke KPK!! -->
+
+<!-- 5. Apakah ada orang yang melakukan vote kepada politisi yang sama dua kali? Siapa namanya dan siapa nama politisinya? -->
diff --git a/query.js b/query.js
new file mode 100644
index 0000000..9514d38
--- /dev/null
+++ b/query.js
@@ -0,0 +1,46 @@
+const sqlite3 = require('sqlite3').verbose();
+const db = new sqlite3.Database('./poll.db');
+
+
+function release_0_1() {
+    db.serialize(function(){
+        db.all("SELECT name,location,grade_current,(SELECT COUNT(*) FROM votes WHERE politicians_id = politicians.politicians_id) AS totalValue FROM politicians WHERE grade_current < 9 ORDER BY grade_current ASC", (err,rows)=>{
+            console.log("\nRelease 0 1:");
+            console.log(rows);
+        });
+    });
+}
+
+
+
+function release_0_2() {
+    db.serialize(function(){
+        db.all(`SELECT (SELECT COUNT(*) FROM votes WHERE politicians_id = politicians.politicians_id) AS totalVote, politicians.name AS politicianName,(first_name||' '||last_name) AS voterName,gender FROM voters
+        LEFT JOIN votes ON politicians.politicians_id = votes.politicians_id
+        LEFT JOIN politicians ON voters.voters_id = votes.voters_id WHERE totalVote IN (SELECT (SELECT COUNT(*) FROM votes WHERE politicians_id = politicians.politicians_id) AS totalVote FROM politicians ORDER BY totalVote DESC LIMIT 3)
+        ORDER BY totalVote DESC`,(err,rows)=>{
+            if(err)
+                console.log(err);
+            console.log("\nRelease 0 2:");
+            console.log(rows);
+        })
+    })
+}
+
+function release_0_3() {
+    db.serialize(function() {
+        db.all("SELECT (SELECT COUNT(*) FROM votes WHERE voters_id = voters.voters_id) AS totalVote,(first_name|| ' '||last_name) AS name,gender,age FROM voters WHERE totalVote > 1 ORDER BY totalVote DESC",
+            (err, rows) => {
+                if(err)
+                    console.log(err);
+                console.log("\nRelease 0 3:");
+                console.log(rows);
+            });
+    });
+}
+
+
+
+// release_0_1();
+// release_0_2();
+release_0_3();
diff --git a/seed-data.js b/seed-data.js
new file mode 100644
index 0000000..0a8e2c9
--- /dev/null
+++ b/seed-data.js
@@ -0,0 +1,48 @@
+//your code here
+const sqlite3 = require('sqlite3').verbose();
+const db = new sqlite3.Database('./poll.db');
+
+const fs = require('fs');
+const voters = fs.readFileSync('./voters.csv','utf8').split('\n');
+const votes = fs.readFileSync('./votes.csv', 'utf8').split('\n');
+const politicians = fs.readFileSync('./politicians.csv','utf8').split("\n");
+
+write_database(politicians,'politicians');
+write_database(voters,'voters');
+write_database(votes,'votes');
+
+db.close();
+
+
+function write_database(arr,table){
+    db.serialize(function(){
+        for(let i = 1; i < arr.length-1; i++){
+            db.run(`INSERT INTO ${table} VALUES (null,${convert_array_value(arr[i])})`);
+        }
+        console.log(`Succeed to insert ${table} data to database`);
+    });
+}
+
+function convert_array_value(arr){
+    let tempArr = arr.split(',');
+    for(let i = 0;i<tempArr.length;i++){
+        if(typeof tempArr[i] == 'string'){
+            tempArr[i] = `"${tempArr[i]}"`
+        }
+    }
+    return tempArr.join(',');
+}
+
+function delete_data(table,id){
+    db.serialize(function(){
+        db.run(`DELETE FROM ${table} WHERE id = ${id}`);
+        console.log(`Deleted data ${id}`);
+    });
+}
+
+function update_data(table,id,parameter,data){
+    db.serialize(function(){
+        db.run(`UPDATE ${table} SET ${parameter} = ${data} WHERE id = ${id}`);
+        console.log(`Update ${parameter} to ${data} in ${id}`);
+    });
+}
diff --git a/setup.js b/setup.js
new file mode 100644
index 0000000..beb6249
--- /dev/null
+++ b/setup.js
@@ -0,0 +1,42 @@
+//your code here
+const sqlite3 = require('sqlite3').verbose();
+const db = new sqlite3.Database('./poll.db');
+
+const fs = require('fs');
+const voters = fs.readFileSync('./voters.csv','utf8').split('\n');
+const votes = fs.readFileSync('./votes.csv', 'utf8').split('\n');
+const politicians = fs.readFileSync('./politicians.csv','utf8').split("\n");
+
+create_database_politicians();
+create_database_voters();
+create_database_votes();
+
+db.close();
+
+
+function create_database_politicians(){
+    let tempArr = politicians[0].split(',');
+    db.serialize(function(){
+        db.run(`DROP TABLE politicians`);
+        db.run(`CREATE TABLE IF NOT EXISTS politicians (politicians_id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, ${tempArr[0]} VARCHAR(50) NOT NULL, ${tempArr[1]} VARCHAR(2) NOT NULL, ${tempArr[2]} VARCHAR(2) NOT NULL, ${tempArr[3]} REAL NOT NULL);`);
+        console.log(`Succeed to create politicians table!`);
+    });
+}
+
+function create_database_voters(){
+    let tempArr = voters[0].split(',');
+    db.serialize(function(){
+        db.run(`DROP TABLE voters`);
+        db.run(`CREATE TABLE IF NOT EXISTS voters (voters_id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, ${tempArr[0]} VARCHAR(20) NOT NULL,${tempArr[1]} VARCHAR(20) NOT NULL,${tempArr[2]} VARCHAR(6) NOT NULL,${tempArr[3]} INTEGER NOT NULL);`);
+        console.log(`Succeed to create voters table!`);
+    });
+}
+
+function create_database_votes(){
+    let tempArr = votes[0].split(',');
+    db.serialize(function(){
+        db.run(`DROP TABLE votes`);
+        db.run(`CREATE TABLE IF NOT EXISTS votes (votes_id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,${tempArr[0]} INTEGER NOT NULL,${tempArr[1]} INTEGER NOT NULL, FOREIGN KEY (${tempArr[1]}) REFERENCES politicians(${tempArr[1]}),FOREIGN KEY (${tempArr[0]}) REFERENCES voters(${tempArr[0]}));`);
+        console.log(`Succeed to create votes table!`);
+    });
+}
diff --git a/voters.csv b/voters.csv
new file mode 100644
index 0000000..54956f0
--- /dev/null
+++ b/voters.csv
@@ -0,0 +1,151 @@
+first_name,last_name,gender,age
+Aaliyah,Langworth,male,61
+Aaliyah,VonRueden,male,73
+Aaliyah,Konopelski,female,39
+Abdullah,Block,male,66
+Amaya,Satterfield,male,23
+Barbara,Ortiz,female,76
+Barney,Lubowitz,female,76
+Berniece,Sanford,female,23
+Betsy,Blick,male,23
+Buster,Hodkiewicz,male,56
+Cade,Batz,female,61
+Cameron,Walsh,female,30
+Cameron,Dickinson,female,36
+Camilla,Feil,male,23
+Candice,Torp,female,23
+Courtney,Spinka,female,42
+Devon,Kutch,female,26
+Devon,Mayer,female,71
+Devon,Waters,female,70
+Devonte,Erdman,female,27
+Devonte,Pfeffer,male,29
+Dora,Schinner,male,78
+Dora,Cole,female,18
+Duncan,Dach,male,70
+Duncan,O'Reilly,male,75
+Durward,Stroman,male,37
+Elias,Watsica,female,50
+Eliezer,Predovic,female,30
+Elinore,Collier,female,75
+Emmett,Corkery,female,88
+Emmie,Swaniawski,female,76
+Fabian,Murphy,female,85
+Fabian,Keeling,male,76
+Fabian,Nolan,male,70
+Fabiola,Klocko,female,45
+Furman,Crist,male,23
+Furman,Waelchi,female,26
+Gabriel,Ledner,male,62
+Gabriel,Dicki,female,87
+Gerald,Bernier,male,23
+Graciela,Berge,female,21
+Grady,Grady,female,34
+Graham,Hoppe,female,19
+Graham,Padberg,male,58
+Harley,Murphy,male,72
+Harley,Runolfsdottir,female,37
+Hudson,Streich,male,25
+Hudson,Donnelly,male,20
+Hugh,Feil,male,33
+Hunter,Erdman,male,68
+Hyman,Grant,male,74
+Ian,Dibbert,male,40
+Isaac,Ratke,male,81
+Isabell,Price,male,73
+Iva,Roob,female,44
+Ivah,Raynor,male,71
+Ivory,Gorczany,female,61
+Ivory,Wolf,female,38
+Ivy,Stehr,female,89
+Janice,Zboncak,male,48
+Janice,Erdman,male,57
+Jason,Erdman,male,37
+Jason,Lang,female,56
+Jenifer,Lind,male,47
+Jennie,Mante,female,21
+Margarett,Wilkinson,male,73
+Margarett,Schultz,female,36
+Margaretta,Koepp,male,72
+Neoma,Gottlieb,male,38
+Nona,Murazik,female,88
+Norbert,Kozey,male,41
+Ottilie,Lakin,female,88
+Prudence,Bergstrom,female,33
+Prudence,Brakus,female,67
+Prudence,Goldner,male,37
+Prudence,Kilback,female,88
+Queen,White,female,64
+Ricardo,Koss,female,65
+Richie,Eichmann,male,85
+Richie,Sanford,female,70
+Santino,Labadie,male,18
+Santino,Nienow,female,62
+Santos,Hintz,female,20
+Santos,Jaskolski,female,79
+Sarah,Feeney,female,64
+Sarah,Hyatt,female,26
+Theodore,Ferry,female,89
+Theodore,Stamm,male,56
+Theresa,Price,female,83
+Theresia,Fay,male,64
+Theresia,Rohan,female,20
+Tobin,Streich,male,77
+Toby,Terry,female,19
+Toby,Wehner,male,18
+Tom,Huel,female,45
+Ursula,Bednar,male,65
+Ursula,Mayer,male,63
+Ursula,Hahn,female,87
+Vanessa,O'Hara,male,28
+Vanessa,Rodriguez,female,40
+Walker,Sauer,male,19
+Walker,Reichert,male,21
+Walker,Stoltenberg,female,59
+Walker,Stiedemann,female,32
+Wallace,Klein,female,41
+Walter,Franecki,female,68
+Walter,Kuvalis,male,22
+Walton,Jerde,female,73
+Xavier,Harber,female,38
+Xavier,Braun,female,41
+Xavier,Streich,female,28
+Yadira,Krajcik,female,81
+Yasmeen,Lubowitz,male,41
+Yasmeen,Thompson,female,80
+Yasmine,Keeling,male,61
+Yasmine,Rippin,female,77
+Yesenia,Schaden,female,55
+Yesenia,Watsica,female,26
+Yessenia,Hudson,female,42
+Yolanda,Jones,male,24
+Yolanda,Reynolds,female,26
+Yolanda,Abernathy,male,90
+Yoshiko,Zulauf,male,42
+Yoshiko,Klein,male,37
+Yvette,Schuster,male,76
+Yvette,Russel,male,88
+Yvonne,Wolff,male,31
+Zachariah,Dach,male,18
+Zachary,Hackett,female,45
+Zachary,Durgan,male,69
+Zachery,Metz,female,52
+Zachery,Lehner,female,25
+Zackary,Funk,female,77
+Zackery,Schuster,female,53
+Zakary,Schiller,male,78
+Zakary,Lehner,female,19
+Zakary,Hodkiewicz,female,62
+Zakary,Padberg,male,30
+Zander,Runte,male,50
+Zane,Little,female,59
+Zaria,Reichert,male,55
+Zaria,Towne,male,85
+Zechariah,Wolff,female,60
+Zechariah,Johnson,female,61
+Zelma,Langworth,male,87
+Zoe,Bernier,female,55
+Zoe,Crona,male,32
+Zoie,Waters,female,21
+Zoila,Leffler,male,72
+Zoila,Cummings,male,52
diff --git a/votes.csv b/votes.csv
new file mode 100644
index 0000000..1ceb779
--- /dev/null
+++ b/votes.csv
@@ -0,0 +1,164 @@
+voters_id,politicians_id,
+1,17
+2,3
+3,7
+4,20
+5,11
+6,12
+7,13
+8,7
+9,1
+10,2
+11,3
+12,4
+13,5
+14,6
+15,7
+16,8
+17,9
+18,10
+19,11
+20,12
+21,7
+22,13
+23,19
+24,18
+25,16
+26,16
+27,7
+28,10
+29,9
+30,1
+31,2
+32,3
+33,7
+34,5
+35,10
+36,7
+37,7
+38,7
+39,2
+40,4
+41,20
+42,7
+43,7
+44,7
+45,4
+46,2
+47,11
+48,13
+49,6
+50,5
+51,15
+52,19
+53,20
+54,4
+55,7
+56,4
+57,6
+58,7
+59,8
+60,12
+61,7
+62,11
+63,7
+64,5
+65,11
+66,13
+67,14
+68,7
+69,7
+70,2
+71,7
+72,9
+73,7
+74,5
+75,7
+76,17
+77,18
+78,17
+79,7
+80,5
+81,4
+82,7
+83,3
+84,4
+85,6
+86,14
+87,12
+88,12
+89,12
+90,7
+91,1
+92,1
+93,4
+94,2
+95,6
+96,7
+97,9
+98,10
+99,10
+100,10
+101,12
+102,7
+103,4
+104,6
+105,7
+106,7
+107,8
+108,8
+109,7
+110,6
+111,5
+112,7
+113,7
+114,7
+115,7
+116,7
+117,7
+118,7
+119,7
+120,7
+121,4
+122,6
+123,7
+124,7
+125,7
+126,7
+127,7
+128,3
+129,19
+130,12
+131,12
+132,5
+133,9
+134,10
+135,10
+136,14
+137,13
+138,13
+139,11
+140,6
+141,5
+142,7
+143,5
+144,7
+145,6
+146,7
+147,7
+148,7
+149,7
+150,7
+1,4
+18,3
+20,9
+44,10
+44,8
+56,11
+56,5
+56,3
+101,7
+101,14
+143,17
+35,13
+28,12