ADD: function getting all users in database

@@ -72,3 +72,17 @@ database.getKeywordsByUserId = async function(userId) {
 
     return result
 }
+
+database.getAllUsers = async function() {
+
+    const users = await User.findAll({
+        raw: true
+    })
+
+    let result = []
+    for (let i = 0; i < users.length; i++) {
+        result.push(users[i].userId)
+    }
+
+    return result
+}
\ No newline at end of file

@@ -13,6 +13,7 @@ sequelize.sync({ force: false })
         database.addKeyword("rtx3060", "junseok")
         database.getKeywordsByUserId("junseok")
         database.deleteKeyword("phobyjun", "rtx3080")
+        database.getAllUsers()
     })
     .catch((err) => {
         console.log('database connection failed');