diff --git a/main.py b/main.py
index 389988a..dfd548c 100644
--- a/main.py
+++ b/main.py
@@ -2,37 +2,47 @@ import os
 
 from table import Table
 from sql import SQL
+import mysql.connector
 
 def main():
-    print("Bem vindo ao SGBD")
-    print("Digite a pasta onde está os arquivos CSV:")
-    #csv_folder = input()
-    csv_folder = "./source"
+    print("Bem-vindo!")
+    print("Deseja utilizar um banco de dados (BD) ou um arquivo .csv (CSV)?")
+    escolha = input()
 
-    tables = {}
+    if escolha == "CSV":
+        print("Digite a pasta onde estão os arquivos CSV:")
+        #csv_folder = input()
+        csv_folder = "./source"
 
-    # get all csv files in the folder
-    for file in os.listdir(csv_folder):
-        if file.endswith(".csv"):
-            table_name = file.split(".")[0]
-            table = Table(table_name)
-            table.load_from_csv(f"{csv_folder}/{file}")
-            tables[table_name] = table
+        tables = {}
 
-    print("Tabelas carregadas:")
-    print(tables.keys())
+        # Seleciona todos o csv presentes na pasta
+        for file in os.listdir(csv_folder):
+            if file.endswith(".csv"):
+                table_name = file.split(".")[0]
+                table = Table(table_name)
+                table.load_from_csv(f"{csv_folder}/{file}")
+                tables[table_name] = table
 
-    while True:
-        print("Digite a query [0 para sair]:")
-        query = input()
+        print("Tabelas carregadas:")
+        print(tables.keys())
 
-        if query == "0":
-            break
+        while True:
+            print("Digite a query [0 para sair]:")
+            query = input()
 
-        sql = SQL(tables, query)
-        sql.execute()
+            if query == "0":
+                break
 
-        print()
+            sql = SQL(tables, query)
+            sql.execute()
+
+            print()
+
+    elif escolha == "BD":
+        print("BD")
+    else:
+        print("Fora do intervalo!")
 
 if __name__ == "__main__":
     main()
\ No newline at end of file
diff --git a/sql.py b/sql.py
index 5b7a4bc..1ba7528 100644
--- a/sql.py
+++ b/sql.py
@@ -8,28 +8,28 @@ class SQL:
     def __str__(self) -> str:
         pass
 
-    # SELECIONAR * DE tabela
+    # ISCOLHE * DE tabela
     def execute(self):
         query_parts = self.query.split(" ")
 
-        if query_parts[0] == "SELECIONAR":
+        if query_parts[0] == "ISCOLHE":
             self.select(query_parts)
         else:
             pass
 
-    # SELECIONAR * DE tabela JUNTAR tabela2 coluna ONDE coluna = valor
+    # ISCOLHE * DE tabela AJUNTAR tabela2 coluna DONDE coluna = valor
     def select(self, query_parts: list) -> None:
         where_filter = None
         join_stmt = None
 
-        if "JUNTAR" in query_parts:
-            index = query_parts.index("JUNTAR")
+        if "AJUNTAR" in query_parts:
+            index = query_parts.index("AJUNTAR")
             join_table = query_parts[index + 1]
             join_column = query_parts[index + 2]
             join_stmt = [self.tables[join_table], join_column]
 
-        if "ONDE" in query_parts:
-            index = query_parts.index("ONDE")
+        if "DONDE" in query_parts:
+            index = query_parts.index("DONDE")
             where_filter_column = query_parts[index + 1]
             where_filter_operator = query_parts[index + 2]
             where_filter_value = query_parts[index + 3]
diff --git a/table.py b/table.py
index 610bec9..0320fd5 100644
--- a/table.py
+++ b/table.py
@@ -14,7 +14,7 @@ class Table:
         with open(csv_file, 'r') as f:
             reader = f.read().splitlines()
 
-            # First line is the column names
+            # Primeira linha contêm o nome das colunas
             self.columns = reader[0].split(',')
             reader.pop(0)