diff --git a/FreeSql/Internal/UtilsExpressionTree.cs b/FreeSql/Internal/UtilsExpressionTree.cs
index b23ef858..fa4fa306 100644
--- a/FreeSql/Internal/UtilsExpressionTree.cs
+++ b/FreeSql/Internal/UtilsExpressionTree.cs
@@ -1150,7 +1150,13 @@ namespace FreeSql.Internal
                             foreach (var col in tbmid.Primarys)
                             {
                                 col.Attribute.IsNullable = false;
-                                col.Attribute.DbType = col.Attribute.DbType.Replace("NOT NULL", "").Replace(" NULL", "").Trim() + " NOT NULL"; //sqlite 主键也可以插入 null
+                                col.Attribute.DbType = col.Attribute.DbType.Replace("NOT NULL", "").Replace(" NULL", "").Trim();
+                                switch (common._orm.Ado.DataType)
+                                {
+                                    case DataType.Sqlite:
+                                        col.Attribute.DbType += " NOT NULL"; //sqlite 主键也可以插入 null
+                                        break;
+                                }
                             }
                         }
                     }
diff --git a/Providers/FreeSql.Provider.QuestDb/QuestDbCodeFirst.cs b/Providers/FreeSql.Provider.QuestDb/QuestDbCodeFirst.cs
index 6c345280..ea4d09ae 100644
--- a/Providers/FreeSql.Provider.QuestDb/QuestDbCodeFirst.cs
+++ b/Providers/FreeSql.Provider.QuestDb/QuestDbCodeFirst.cs
@@ -56,7 +56,7 @@ namespace FreeSql.QuestDb
 
             { typeof(string).FullName, CsToDb.New(NpgsqlDbType.Varchar, "string", "string", false, null, "") },
             { typeof(char).FullName, CsToDb.New(NpgsqlDbType.Char, "char", "char", false, null, '\0') },
-            { typeof(Guid).FullName, CsToDb.New(NpgsqlDbType.Char, "symbol", "symbol NOT NULL", false, null, Guid.Empty) },
+            { typeof(Guid).FullName, CsToDb.New(NpgsqlDbType.Char, "symbol", "symbol", false, null, Guid.Empty) },
             { typeof(Guid?).FullName, CsToDb.New(NpgsqlDbType.Char, "symbol", "symbol", false, true, null) },
 
             { typeof(DateTime).FullName, CsToDb.New(NpgsqlDbType.Timestamp, "timestamp", "timestamp NOT NULL", false, false, new DateTime(1970, 1, 1)) },