diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..b512c09d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+node_modules
\ No newline at end of file
diff --git a/api/accounts/accounts-middleware.js b/api/accounts/accounts-middleware.js
index ca95d597..b099f504 100644
--- a/api/accounts/accounts-middleware.js
+++ b/api/accounts/accounts-middleware.js
@@ -1,12 +1,77 @@
+const Account = require("./accounts-model");
+const yup = require("yup");
+//yup ile yaparsak:
+const accountSchema = yup.object().shape({
+  name: yup
+    .string()
+    .required("name and budget are required")
+    .min(3, "name of account must be between 3 and 100")
+    .max(100, "name of account must be between 3 and 100"),
+  budget: yup
+    .number("budget of account must be a number")
+    .required("name and budget are required")
+    .min(0, "budget of account is too large or too small")
+    .max(1000000, "budget of account is too large or too small"),
+});
 exports.checkAccountPayload = (req, res, next) => {
   // KODLAR BURAYA
   // Not: Validasyon için Yup(şu an yüklü değil!) kullanabilirsiniz veya kendiniz manuel yazabilirsiniz.
-}
+  //yup ile yaparsak:(async ile yaptık)
+  // try {
+  //   await accountSchema.validate(req.body);
+  //   req.account=req.body
+  // } catch (error) {
+  //   res.status(400).json({mesaage:error.mesaage || "Hata oluştu"})
+  // }
+  const { name, budget } = req.body;
+  if (!name || budget === undefined) {
+    res.status(400).json({ message: "name and budget are required" });
+  } else if (name.trim().length < 3 || name.trim().length > 100) {
+    res
+      .status(400)
+      .json({ message: "name of account must be between 3 and 100" });
+  } else if (typeof budget !== "number") {
+    res.status(400).json({ message: "budget of account must be a number" });
+  } else if (budget < 0 || budget > 1000000) {
+    res
+      .status(400)
+      .json({ message: "budget of account is too large or too small" });
+  }
+  next();
+};
 
-exports.checkAccountNameUnique = (req, res, next) => {
+exports.checkAccountNameUnique = async (req, res, next) => {
   // KODLAR BURAYA
-}
+  try {
+    req.body.name = req.body.name.trim();
+    //await accountSchema.validate(req.body);
+    let allAccount = await Account.getAll();
+    let isFound = false;
+    for (let i = 0; i < allAccount.length; i++) {
+      if (allAccount[i].name == req.body.name) {
+        isFound = true;
+        break;
+      }
+    }
+    if (isFound) {
+      res.status(400).json({ message: "that name is taken" });
+    }
+  } catch (error) {
+    next(error);
+  }
+  next();
+};
 
-exports.checkAccountId = (req, res, next) => {
-  // KODLAR BURAYA
-}
+exports.checkAccountId = async (req, res, next) => {
+  try {
+    const account = await Account.getById(req.params.id);
+    if (!account) {
+      res.status(404).json({ message: "account not found" });
+    } else {
+      req.account = account;
+      next();
+    }
+  } catch (error) {
+    next(error);
+  }
+};
diff --git a/api/accounts/accounts-model.js b/api/accounts/accounts-model.js
index b963499f..301febec 100644
--- a/api/accounts/accounts-model.js
+++ b/api/accounts/accounts-model.js
@@ -1,22 +1,40 @@
+const db = require("../../data/db-config");
+
 const getAll = () => {
-  // KODLAR BURAYA
-}
+  //select * from accounts
+  return db("accounts");
+};
 
-const getById = id => {
-  // KODLAR BURAYA
-}
+const getById = (id) => {
+  //select * from accounts where id=id
+  // return db("accounts").where({id}).first();
+  return db("accounts").where("id", id).first();
+};
 
-const create = account => {
-  // KODLAR BURAYA
-}
+const create = (account) => {
+  //inset into account values (id,name,budget)
+  const insertedAccount = db("accounts")
+    .insert(account)
+    .then((id) => {
+      return getById(id[0]);
+    });
+  return insertedAccount;
+};
 
 const updateById = (id, account) => {
-  // KODLAR BURAYA
-}
+  // update accounts name=account.name, budget=account.budget where id=id
+  return db("accounts")
+    .where("id", id)
+    .update(account)
+    .then((rows) => {
+      return getById(id);
+    });
+};
 
-const deleteById = id => {
-  // KODLAR BURAYA
-}
+const deleteById = (id) => {
+  // delete from accounts where id=id
+  return db("accounts").where("id", id).del();
+};
 
 module.exports = {
   getAll,
@@ -24,4 +42,4 @@ module.exports = {
   create,
   updateById,
   deleteById,
-}
+};
diff --git a/api/accounts/accounts-router.js b/api/accounts/accounts-router.js
index a8ba969f..f1b5ac3f 100644
--- a/api/accounts/accounts-router.js
+++ b/api/accounts/accounts-router.js
@@ -1,27 +1,71 @@
-const router = require('express').Router()
+const router = require("express").Router();
+const Account = require("./accounts-model");
+const mw = require("./accounts-middleware");
 
-router.get('/', (req, res, next) => {
-  // KODLAR BURAYA
-})
+router.get("/", (req, res, next) => {
+  Account.getAll()
+    .then((account) => {
+      res.json(account);
+    })
+    .catch((err) => {
+      res.json([]);
+    });
+});
 
-router.get('/:id', (req, res, next) => {
-  // KODLAR BURAYA
-})
+router.get("/:id", mw.checkAccountId, async (req, res, next) => {
+  try {
+    res.json(req.account);
+  } catch (error) {
+    next(error);
+  }
+});
 
-router.post('/', (req, res, next) => {
-  // KODLAR BURAYA
-})
+router.post(
+  "/",
+  mw.checkAccountPayload,
+  mw.checkAccountNameUnique,
+  async (req, res, next) => {
+    // KODLAR BURAYA
+    try {
+      let insertData = await Account.create(req.body);
+      res.status(201).json(insertData);
+    } catch (error) {
+      next(error);
+    }
+  }
+);
 
-router.put('/:id', (req, res, next) => {
-  // KODLAR BURAYA
-});
+router.put(
+  "/:id",
+  mw.checkAccountId,
+  mw.checkAccountPayload,
+  async (req, res, next) => {
+    try {
+      const updateAccount = await Account.updateById(req.params.id, req.body);
+      res.json(updateAccount);
+    } catch (error) {
+      next(error);
+    }
+  }
+);
 
-router.delete('/:id', (req, res, next) => {
+router.delete("/:id", mw.checkAccountId, async (req, res, next) => {
   // KODLAR BURAYA
-})
+  try {
+    await Account.deleteById(req.params.id);
+    res.json(req.account);
+  } catch (error) {
+    next(error);
+  }
+});
 
-router.use((err, req, res, next) => { // eslint-disable-line
+router.use((err, req, res, next) => {
+  // eslint-disable-line
   // KODLAR BURAYA
-})
+  res.status(err.status || 500).json({
+    customMessage: "Bir hata oluştu",
+    message: err.message,
+  });
+});
 
 module.exports = router;
diff --git a/api/server.js b/api/server.js
index 5d25c978..e2a64bd8 100644
--- a/api/server.js
+++ b/api/server.js
@@ -4,4 +4,11 @@ const server = express();
 
 server.use(express.json());
 
+const userAccount = require("./accounts/accounts-router");
+
+server.use("/api/accounts", userAccount);
+server.get("/", (req, res) => {
+  res.json({ message: "Hey, server is up and running..." });
+});
+
 module.exports = server;
diff --git a/data/budget.db3 b/data/budget.db3
index 0df1e8ec..a906b8bd 100644
Binary files a/data/budget.db3 and b/data/budget.db3 differ
diff --git a/data/testing.db3 b/data/testing.db3
new file mode 100644
index 00000000..893650bc
Binary files /dev/null and b/data/testing.db3 differ
diff --git a/package-lock.json b/package-lock.json
index 4ce88d1e..16a055c1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,16 +1,17 @@
 {
-  "name": "node-db1-project",
+  "name": "node-db-project-1",
   "version": "1.0.0",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
-      "name": "node-db1-project",
+      "name": "node-db-project-1",
       "version": "1.0.0",
       "dependencies": {
         "express": "^4.18.1",
         "knex": "^2.0.0",
-        "sqlite3": "^5.0.8"
+        "sqlite3": "^5.0.8",
+        "yup": "^1.0.2"
       },
       "devDependencies": {
         "@types/jest": "^27.5.0",
@@ -5719,6 +5720,11 @@
         "node": ">= 6"
       }
     },
+    "node_modules/property-expr": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/property-expr/-/property-expr-2.0.5.tgz",
+      "integrity": "sha512-IJUkICM5dP5znhCckHSv30Q4b5/JA5enCtkRHYaOVOAocnH/1BQEYTC5NMfT3AVl/iXKdr3aqQbQn9DxyWknwA=="
+    },
     "node_modules/proxy-addr": {
       "version": "2.0.7",
       "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.7.tgz",
@@ -6544,6 +6550,11 @@
         "node": ">=8"
       }
     },
+    "node_modules/tiny-case": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/tiny-case/-/tiny-case-1.0.3.tgz",
+      "integrity": "sha512-Eet/eeMhkO6TX8mnUteS9zgPbUMQa4I6Kkp5ORiBD5476/m+PIRiumP5tmh5ioJpH7k51Kehawy2UDfsnxxY8Q=="
+    },
     "node_modules/tmpl": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.5.tgz",
@@ -6588,6 +6599,11 @@
         "node": ">=0.6"
       }
     },
+    "node_modules/toposort": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/toposort/-/toposort-2.0.2.tgz",
+      "integrity": "sha512-0a5EOkAUp8D4moMi2W8ZF8jcga7BgZd91O/yabJCFY8az+XSzeGyTKs0Aoo897iV1Nj6guFq8orWDS96z91oGg=="
+    },
     "node_modules/touch": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/touch/-/touch-3.1.0.tgz",
@@ -6974,6 +6990,28 @@
       "engines": {
         "node": ">=12"
       }
+    },
+    "node_modules/yup": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/yup/-/yup-1.0.2.tgz",
+      "integrity": "sha512-Lpi8nITFKjWtCoK3yQP8MUk78LJmHWqbFd0OOMXTar+yjejlQ4OIIoZgnTW1bnEUKDw6dZBcy3/IdXnt2KDUow==",
+      "dependencies": {
+        "property-expr": "^2.0.5",
+        "tiny-case": "^1.0.3",
+        "toposort": "^2.0.2",
+        "type-fest": "^2.19.0"
+      }
+    },
+    "node_modules/yup/node_modules/type-fest": {
+      "version": "2.19.0",
+      "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-2.19.0.tgz",
+      "integrity": "sha512-RAH822pAdBgcNMAfWnCBU3CFZcfZ/i1eZjwFU/dsLKumyuuP3niueg2UAukXYF0E2AAoc82ZSSf9J0WQBinzHA==",
+      "engines": {
+        "node": ">=12.20"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
     }
   },
   "dependencies": {
@@ -11350,6 +11388,11 @@
         "sisteransi": "^1.0.5"
       }
     },
+    "property-expr": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/property-expr/-/property-expr-2.0.5.tgz",
+      "integrity": "sha512-IJUkICM5dP5znhCckHSv30Q4b5/JA5enCtkRHYaOVOAocnH/1BQEYTC5NMfT3AVl/iXKdr3aqQbQn9DxyWknwA=="
+    },
     "proxy-addr": {
       "version": "2.0.7",
       "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.7.tgz",
@@ -11965,6 +12008,11 @@
       "resolved": "https://registry.npmjs.org/tildify/-/tildify-2.0.0.tgz",
       "integrity": "sha512-Cc+OraorugtXNfs50hU9KS369rFXCfgGLpfCfvlc+Ud5u6VWmUQsOAa9HbTvheQdYnrdJqqv1e5oIqXppMYnSw=="
     },
+    "tiny-case": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/tiny-case/-/tiny-case-1.0.3.tgz",
+      "integrity": "sha512-Eet/eeMhkO6TX8mnUteS9zgPbUMQa4I6Kkp5ORiBD5476/m+PIRiumP5tmh5ioJpH7k51Kehawy2UDfsnxxY8Q=="
+    },
     "tmpl": {
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/tmpl/-/tmpl-1.0.5.tgz",
@@ -11997,6 +12045,11 @@
       "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
       "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA=="
     },
+    "toposort": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/toposort/-/toposort-2.0.2.tgz",
+      "integrity": "sha512-0a5EOkAUp8D4moMi2W8ZF8jcga7BgZd91O/yabJCFY8az+XSzeGyTKs0Aoo897iV1Nj6guFq8orWDS96z91oGg=="
+    },
     "touch": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/touch/-/touch-3.1.0.tgz",
@@ -12300,6 +12353,24 @@
       "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-21.0.1.tgz",
       "integrity": "sha512-9BK1jFpLzJROCI5TzwZL/TU4gqjK5xiHV/RfWLOahrjAko/e4DJkRDZQXfvqAsiZzzYhgAzbgz6lg48jcm4GLg==",
       "dev": true
+    },
+    "yup": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/yup/-/yup-1.0.2.tgz",
+      "integrity": "sha512-Lpi8nITFKjWtCoK3yQP8MUk78LJmHWqbFd0OOMXTar+yjejlQ4OIIoZgnTW1bnEUKDw6dZBcy3/IdXnt2KDUow==",
+      "requires": {
+        "property-expr": "^2.0.5",
+        "tiny-case": "^1.0.3",
+        "toposort": "^2.0.2",
+        "type-fest": "^2.19.0"
+      },
+      "dependencies": {
+        "type-fest": {
+          "version": "2.19.0",
+          "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-2.19.0.tgz",
+          "integrity": "sha512-RAH822pAdBgcNMAfWnCBU3CFZcfZ/i1eZjwFU/dsLKumyuuP3niueg2UAukXYF0E2AAoc82ZSSf9J0WQBinzHA=="
+        }
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 95ffa00e..916c56d8 100644
--- a/package.json
+++ b/package.json
@@ -9,9 +9,10 @@
     "resetdb": "knex migrate:rollback && knex migrate:latest && knex seed:run"
   },
   "dependencies": {
-    "sqlite3": "^5.0.8",
     "express": "^4.18.1",
-    "knex": "^2.0.0"
+    "knex": "^2.0.0",
+    "sqlite3": "^5.0.8",
+    "yup": "^1.0.2"
   },
   "devDependencies": {
     "@types/jest": "^27.5.0",
diff --git a/queries.sql b/queries.sql
index 6c251068..ac9f41ef 100644
--- a/queries.sql
+++ b/queries.sql
@@ -2,16 +2,42 @@
 
 -- Posta kodu 1010 olan tüm müşterileri bulun
 
+        SELECT * FROM Customers 
+        WHERE PostalCode=1010;
+
 -- id'si 11 olan tedarikçinin telefon numarasını bulun
 
+        SELECT Phone FROM Suppliers
+        WHERE SupplierID=11;
+
 -- Verilen ilk 10 siparişi, sipariş tarihine göre azalan şekilde listeleyin
 
+        SELECT * FROM Orders
+        ORDER BY OrderDate DESC
+        Limit 10;
+
 -- Londra, Madrid veya Brezilya'da yaşayan tüm müşterileri bulun
 
+        SELECT * FROM Customers
+        WHERE City="London" OR 
+        City="Madrid" OR Country="Brazil";
+
 -- "The Shire" için bir müşteri kaydı ekleyin, ilgili kişi adı "Bilbo Baggins", adres - "Bag End" içinde "1 Hobbit-Hole", posta kodu "111" ve ülke "Middle Earth"
 
+        INSERT INTO Customers 
+        (CustomerName,ContactName,Address,City,PostalCode,Country)
+        VALUES 
+        ("The Shire","Bilbo Baggins","Bag End","1 Hobbit-Hole",111,"Middle Earth");
+
 -- Posta kodu "11122" olarak değişecek şekilde Bilbo Baggins kaydını güncelleyin
 
+        UPDATE Customers SET PostalCode=11122
+        WHERE ContactName="Bilbo Baggins";
+
 -- (Zorlayıcı Görev) Müşteriler tablosunda kaç farklı şehrin saklandığını keşfetmek için bir sorgu bulun. Tekrarlar çift sayılmamalıdır
 
--- (Zorlayıcı Görev) 20 karakterden uzun adları olan tüm tedarikçileri bulun. Adın uzunluğunu almak için "length(SupplierName)" kullanabilirsiniz.
\ No newline at end of file
+        SELECT COUNT(DISTINCT City) AS NumberOfCity FROM Customers;
+
+-- (Zorlayıcı Görev) 20 karakterden uzun adları olan tüm tedarikçileri bulun. Adın uzunluğunu almak için "length(SupplierName)" kullanabilirsiniz.
+
+        SELECT * from Suppliers WHERE LEN("SupplierName") > 20 ;
\ No newline at end of file