diff --git a/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/CodeFirst/MySqlCodeFirst.cs b/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/CodeFirst/MySqlCodeFirst.cs
index bd45e64f9..32fa5fefa 100644
--- a/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/CodeFirst/MySqlCodeFirst.cs
+++ b/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/CodeFirst/MySqlCodeFirst.cs
@@ -25,6 +25,10 @@ namespace SqlSugar.MySqlConnector
                     DbColumnInfo dbColumnInfo = this.EntityColumnToDbColumn(entityInfo, tableName, item);
                     columns.Add(dbColumnInfo);
                 }
+                if (entityInfo.IsCreateTableFiledSort)
+                {
+                    columns = columns.OrderBy(c => c.CreateTableFieldSort).ToList();
+                }
             }
             this.Context.DbMaintenance.CreateTable(tableName, columns,true);
         }
@@ -42,7 +46,8 @@ namespace SqlSugar.MySqlConnector
                 DefaultValue = item.DefaultValue,
                 ColumnDescription = item.ColumnDescription,
                 Length = item.Length,
-                DecimalDigits=item.DecimalDigits
+                DecimalDigits=item.DecimalDigits,
+                CreateTableFieldSort = item.CreateTableFieldSort
             };
             GetDbType(item, propertyType, result);
             if (result.DataType.Equals("varchar", StringComparison.CurrentCultureIgnoreCase) && result.Length == 0)
diff --git a/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/DbMaintenance/MySqlDbMaintenance.cs b/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/DbMaintenance/MySqlDbMaintenance.cs
index 8897225ad..2b5a0ec8d 100644
--- a/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/DbMaintenance/MySqlDbMaintenance.cs
+++ b/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/DbMaintenance/MySqlDbMaintenance.cs
@@ -269,7 +269,7 @@ namespace SqlSugar.MySqlConnector
         {
             get
             {
-                return "SELECT count(*) FROM information_schema.statistics WHERE index_name = '{0}'";
+                return "SELECT count(*) FROM information_schema.statistics WHERE index_name = '{0}' and index_schema = '{1}'";
             }
         }
         #endregion
@@ -308,7 +308,9 @@ namespace SqlSugar.MySqlConnector
             }
             var oldDatabaseName = this.Context.Ado.Connection.Database;
             var connection = this.Context.CurrentConnectionConfig.ConnectionString;
-            Check.Exception(Regex.Split(connection,oldDatabaseName).Length > 2, "The user name and password cannot be the same as the database name ");
+            Check.ExceptionEasy(Regex.Split(connection,oldDatabaseName).Length > 2
+                , "The user name and password cannot be the same as the database name ",
+                " 创建数据库失败, 请换一个库名，库名不能 password 或者 username 有重叠 ");
             connection = connection.Replace(oldDatabaseName, "mysql");
             var newDb = new SqlSugarClient(new ConnectionConfig()
             {
diff --git a/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/SqlBuilder/MySqlBlukCopy.cs b/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/SqlBuilder/MySqlBlukCopy.cs
index 6e4ead42c..a72728b68 100644
--- a/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/SqlBuilder/MySqlBlukCopy.cs
+++ b/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/SqlBuilder/MySqlBlukCopy.cs
@@ -176,7 +176,7 @@ namespace SqlSugar.MySqlConnector
                     {
                         sb.Append(row[colum].ObjToDate().ToString("yyyy-MM-dd HH:mm:ss.fff"));
                     }
-                    else if (colum.DataType == UtilConstants.DateType && row[colum] != null && row[colum] == DBNull.Value)
+                    else if (row[colum] == null || row[colum] == DBNull.Value)
                     {
                         sb.Append("NULL");
                     }
diff --git a/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/SqlBuilder/MySqlExpressionContext.cs b/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/SqlBuilder/MySqlExpressionContext.cs
index f75efc99b..64c130407 100644
--- a/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/SqlBuilder/MySqlExpressionContext.cs
+++ b/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/SqlBuilder/MySqlExpressionContext.cs
@@ -14,6 +14,10 @@ namespace SqlSugar.MySqlConnector
     }
     public class MySqlMethod : DefaultDbMethod, IDbMethods
     {
+        public override string GetStringJoinSelector(string result, string separator)
+        {
+            return $"group_concat({result}  separator '{separator}') ";
+        }
         public override string DateDiff(MethodCallExpressionModel model)
         {
             var parameter = model.Args[0];
@@ -146,7 +150,14 @@ namespace SqlSugar.MySqlConnector
         {
             var parameter = model.Args[0];
             var parameter1 = model.Args[1];
-            return string.Format("IFNULL({0},{1})", parameter.MemberName, parameter1.MemberName);
+            if (parameter1.MemberValue is bool)
+            {
+                return string.Format("IFNULL(CAST({0} as SIGNED),{1})", parameter.MemberName, parameter1.MemberName);
+            }
+            else
+            {
+                return string.Format("IFNULL({0},{1})", parameter.MemberName, parameter1.MemberName);
+            }
         }
         public override string GetDate()
         {
diff --git a/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/SqlBuilder/MySqlQueryBuilder.cs b/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/SqlBuilder/MySqlQueryBuilder.cs
index 1278400d7..86c9810ef 100644
--- a/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/SqlBuilder/MySqlQueryBuilder.cs
+++ b/Src/Asp.NetCore2/SqlSugar.MySqlConnectorCore/MySql/SqlBuilder/MySqlQueryBuilder.cs
@@ -53,6 +53,10 @@ namespace SqlSugar.MySqlConnector
             }
             else if (Skip != null && Take != null)
             {
+                if (Skip == 0 && Take == 1 && this.OrderByValue == "ORDER BY NOW() ")
+                {
+                    this.OrderByValue = null;
+                }
                 if (this.OrderByValue == "ORDER BY ") this.OrderByValue += GetSelectValue.Split(',')[0];
                 result = string.Format(PageTempalte, GetSelectValue, GetTableNameString, GetWhereValueString, GetGroupByString + HavingInfos, GetOrderByString, Skip.ObjToInt() > 0 ? Skip.ObjToInt() : 0, Take);
             }
@@ -111,7 +115,7 @@ namespace SqlSugar.MySqlConnector
         }
         public override string ToCountSql(string sql)
         {
-            if (this.GroupByValue.HasValue())
+            if (this.GroupByValue.HasValue()||this.IsDistinct)
             {
                 return base.ToCountSql(sql);
             }