add test for column percentage

Author: erfannariman

pandas/tests/io/test_sql.py

@@ -952,7 +952,6 @@ def test_escaped_table_name(self):
 
         tm.assert_frame_equal(res, df)
 
-
 @pytest.mark.single
 @pytest.mark.skipif(not SQLALCHEMY_INSTALLED, reason="SQLAlchemy not installed")
 class TestSQLApi(SQLAlchemyMixIn, _TestSQLApi):
@@ -1118,6 +1117,15 @@ def test_query_by_select_obj(self):
         all_names = set(iris_df["Name"])
         assert all_names == {"Iris-setosa"}
 
+    def test_column_with_percentage(self):
+        # GH 37157
+        df = DataFrame({"A": [0, 1, 2], "%_variation": [3, 4, 5]})
+        df.to_sql("test_column_percentage", self.conn, index=False)
+
+        res = sql.read_sql_table("test_column_percentage", self.conn)
+
+        tm.assert_frame_equal(res, df)
+
 
 class _EngineToConnMixin:
     """