diff --git a/dialects/mssql.go b/dialects/mssql.go
index 083fb65d..15d1cd06 100644
--- a/dialects/mssql.go
+++ b/dialects/mssql.go
@@ -284,7 +284,7 @@ func (db *mssql) SQLType(c *schemas.Column) string {
 	case schemas.TimeStampz:
 		res = "DATETIMEOFFSET"
 		c.Length = 7
-	case schemas.MediumInt:
+	case schemas.MediumInt, schemas.UnsignedInt:
 		res = schemas.Int
 	case schemas.Text, schemas.MediumText, schemas.TinyText, schemas.LongText, schemas.Json:
 		res = db.defaultVarchar + "(MAX)"
@@ -296,7 +296,7 @@ func (db *mssql) SQLType(c *schemas.Column) string {
 	case schemas.TinyInt:
 		res = schemas.TinyInt
 		c.Length = 0
-	case schemas.BigInt:
+	case schemas.BigInt, schemas.UnsignedBigInt:
 		res = schemas.BigInt
 		c.Length = 0
 	case schemas.NVarchar:
diff --git a/dialects/mysql.go b/dialects/mysql.go
index 769e30b1..2b530daf 100644
--- a/dialects/mysql.go
+++ b/dialects/mysql.go
@@ -254,6 +254,10 @@ func (db *mysql) SQLType(c *schemas.Column) string {
 		c.Length = 40
 	case schemas.Json:
 		res = schemas.Text
+	case schemas.UnsignedInt:
+		res = schemas.Int
+	case schemas.UnsignedBigInt:
+		res = schemas.BigInt
 	default:
 		res = t
 	}
@@ -271,6 +275,11 @@ func (db *mysql) SQLType(c *schemas.Column) string {
 	} else if hasLen1 {
 		res += "(" + strconv.Itoa(c.Length) + ")"
 	}
+
+	if c.SQLType.Name == schemas.UnsignedBigInt || c.SQLType.Name == schemas.UnsignedInt {
+		res += " UNSIGNED"
+	}
+
 	return res
 }
 
@@ -331,16 +340,16 @@ func (db *mysql) GetColumns(queryer core.Queryer, ctx context.Context, tableName
 		col := new(schemas.Column)
 		col.Indexes = make(map[string]int)
 
-		var columnName, isNullable, colType, colKey, extra, comment string
-		var alreadyQuoted bool
+		var columnName, nullableStr, colType, colKey, extra, comment string
+		var alreadyQuoted, isUnsigned bool
 		var colDefault *string
-		err = rows.Scan(&columnName, &isNullable, &colDefault, &colType, &colKey, &extra, &comment, &alreadyQuoted)
+		err = rows.Scan(&columnName, &nullableStr, &colDefault, &colType, &colKey, &extra, &comment, &alreadyQuoted)
 		if err != nil {
 			return nil, nil, err
 		}
 		col.Name = strings.Trim(columnName, "` ")
 		col.Comment = comment
-		if "YES" == isNullable {
+		if nullableStr == "YES" {
 			col.Nullable = true
 		}
 
@@ -351,6 +360,11 @@ func (db *mysql) GetColumns(queryer core.Queryer, ctx context.Context, tableName
 			col.DefaultIsEmpty = true
 		}
 
+		fields := strings.Fields(colType)
+		if len(fields) == 2 && fields[1] == "unsigned" {
+			isUnsigned = true
+		}
+		colType = fields[0]
 		cts := strings.Split(colType, "(")
 		colName := cts[0]
 		// Remove the /* mariadb-5.3 */ suffix from coltypes
@@ -389,11 +403,8 @@ func (db *mysql) GetColumns(queryer core.Queryer, ctx context.Context, tableName
 				}
 			}
 		}
-		if colType == "FLOAT UNSIGNED" {
-			colType = "FLOAT"
-		}
-		if colType == "DOUBLE UNSIGNED" {
-			colType = "DOUBLE"
+		if isUnsigned {
+			colType = "UNSIGNED " + colType
 		}
 		col.Length = len1
 		col.Length2 = len2
diff --git a/dialects/postgres.go b/dialects/postgres.go
index a2c0de74..2b234c66 100644
--- a/dialects/postgres.go
+++ b/dialects/postgres.go
@@ -833,12 +833,12 @@ func (db *postgres) SQLType(c *schemas.Column) string {
 	case schemas.Bit:
 		res = schemas.Boolean
 		return res
-	case schemas.MediumInt, schemas.Int, schemas.Integer:
+	case schemas.MediumInt, schemas.Int, schemas.Integer, schemas.UnsignedInt:
 		if c.IsAutoIncrement {
 			return schemas.Serial
 		}
 		return schemas.Integer
-	case schemas.BigInt:
+	case schemas.BigInt, schemas.UnsignedBigInt:
 		if c.IsAutoIncrement {
 			return schemas.BigSerial
 		}
@@ -1052,6 +1052,10 @@ WHERE n.nspname= s.table_schema AND c.relkind = 'r'::char AND c.relname = $1%s A
 			}
 		}
 
+		if colDefault != nil && *colDefault == "unique_rowid()" { // ignore the system column added by cockroach
+			continue
+		}
+
 		col.Name = strings.Trim(colName, `" `)
 
 		if colDefault != nil {
diff --git a/dialects/sqlite3.go b/dialects/sqlite3.go
index 62a38397..82683606 100644
--- a/dialects/sqlite3.go
+++ b/dialects/sqlite3.go
@@ -193,7 +193,8 @@ func (db *sqlite3) SQLType(c *schemas.Column) string {
 	case schemas.Char, schemas.Varchar, schemas.NVarchar, schemas.TinyText,
 		schemas.Text, schemas.MediumText, schemas.LongText, schemas.Json:
 		return schemas.Text
-	case schemas.Bit, schemas.TinyInt, schemas.SmallInt, schemas.MediumInt, schemas.Int, schemas.Integer, schemas.BigInt:
+	case schemas.Bit, schemas.TinyInt, schemas.SmallInt, schemas.MediumInt, schemas.Int, schemas.Integer, schemas.BigInt,
+		schemas.UnsignedBigInt, schemas.UnsignedInt:
 		return schemas.Integer
 	case schemas.Float, schemas.Double, schemas.Real:
 		return schemas.Real
diff --git a/go.mod b/go.mod
index b9eec3a0..5e073207 100644
--- a/go.mod
+++ b/go.mod
@@ -1,9 +1,9 @@
 module xorm.io/xorm
 
-go 1.11
+go 1.13
 
 require (
-	github.com/denisenkom/go-mssqldb v0.0.0-20200428022330-06a60b6afbbc
+	github.com/denisenkom/go-mssqldb v0.9.0
 	github.com/go-sql-driver/mysql v1.5.0
 	github.com/lib/pq v1.7.0
 	github.com/mattn/go-sqlite3 v1.14.6
diff --git a/go.sum b/go.sum
index 7c72c699..230c16aa 100644
--- a/go.sum
+++ b/go.sum
@@ -2,8 +2,8 @@ gitea.com/xorm/sqlfiddle v0.0.0-20180821085327-62ce714f951a h1:lSA0F4e9A2NcQSqGq
 gitea.com/xorm/sqlfiddle v0.0.0-20180821085327-62ce714f951a/go.mod h1:EXuID2Zs0pAQhH8yz+DNjUbjppKQzKFAn28TMYPB6IU=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/denisenkom/go-mssqldb v0.0.0-20200428022330-06a60b6afbbc h1:VRRKCwnzqk8QCaRC4os14xoKDdbHqqlJtJA0oc1ZAjg=
-github.com/denisenkom/go-mssqldb v0.0.0-20200428022330-06a60b6afbbc/go.mod h1:xbL0rPBG9cCiLr28tMa8zpbdarY27NDyej4t/EjAShU=
+github.com/denisenkom/go-mssqldb v0.9.0 h1:RSohk2RsiZqLZ0zCjtfn3S4Gp4exhpBWHyQ7D0yGjAk=
+github.com/denisenkom/go-mssqldb v0.9.0/go.mod h1:xbL0rPBG9cCiLr28tMa8zpbdarY27NDyej4t/EjAShU=
 github.com/dustin/go-humanize v1.0.0 h1:VSnTsYCnlFHaM2/igO1h6X3HA71jcobQuxemgkq4zYo=
 github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
diff --git a/integrations/types_test.go b/integrations/types_test.go
index 112308f3..d0357d6b 100644
--- a/integrations/types_test.go
+++ b/integrations/types_test.go
@@ -375,3 +375,30 @@ func TestCustomType2(t *testing.T) {
 
 	fmt.Println(users)
 }
+
+func TestUnsigned(t *testing.T) {
+	type MyUnsignedStruct struct {
+		Id uint64
+	}
+
+	assert.NoError(t, PrepareEngine())
+	assertSync(t, new(MyUnsignedStruct))
+
+	tables, err := testEngine.DBMetas()
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, len(tables))
+	assert.EqualValues(t, 1, len(tables[0].Columns()))
+
+	switch testEngine.Dialect().URI().DBType {
+	case schemas.SQLITE:
+		assert.EqualValues(t, "INTEGER", tables[0].Columns()[0].SQLType.Name)
+	case schemas.MYSQL:
+		assert.EqualValues(t, "UNSIGNED BIGINT", tables[0].Columns()[0].SQLType.Name)
+	case schemas.POSTGRES:
+		assert.EqualValues(t, "BIGINT", tables[0].Columns()[0].SQLType.Name)
+	case schemas.MSSQL:
+		assert.EqualValues(t, "BIGINT", tables[0].Columns()[0].SQLType.Name)
+	default:
+		assert.False(t, true, "Unsigned is not implemented")
+	}
+}
diff --git a/schemas/type.go b/schemas/type.go
index f0ede296..6b50d184 100644
--- a/schemas/type.go
+++ b/schemas/type.go
@@ -73,13 +73,16 @@ func (s *SQLType) IsXML() bool {
 }
 
 var (
-	Bit       = "BIT"
-	TinyInt   = "TINYINT"
-	SmallInt  = "SMALLINT"
-	MediumInt = "MEDIUMINT"
-	Int       = "INT"
-	Integer   = "INTEGER"
-	BigInt    = "BIGINT"
+	Bit            = "BIT"
+	UnsignedBit    = "UNSIGNED BIT"
+	TinyInt        = "TINYINT"
+	SmallInt       = "SMALLINT"
+	MediumInt      = "MEDIUMINT"
+	Int            = "INT"
+	UnsignedInt    = "UNSIGNED INT"
+	Integer        = "INTEGER"
+	BigInt         = "BIGINT"
+	UnsignedBigInt = "UNSIGNED BIGINT"
 
 	Enum = "ENUM"
 	Set  = "SET"
@@ -136,13 +139,16 @@ var (
 	Array = "ARRAY"
 
 	SqlTypes = map[string]int{
-		Bit:       NUMERIC_TYPE,
-		TinyInt:   NUMERIC_TYPE,
-		SmallInt:  NUMERIC_TYPE,
-		MediumInt: NUMERIC_TYPE,
-		Int:       NUMERIC_TYPE,
-		Integer:   NUMERIC_TYPE,
-		BigInt:    NUMERIC_TYPE,
+		Bit:            NUMERIC_TYPE,
+		UnsignedBit:    NUMERIC_TYPE,
+		TinyInt:        NUMERIC_TYPE,
+		SmallInt:       NUMERIC_TYPE,
+		MediumInt:      NUMERIC_TYPE,
+		Int:            NUMERIC_TYPE,
+		UnsignedInt:    NUMERIC_TYPE,
+		Integer:        NUMERIC_TYPE,
+		BigInt:         NUMERIC_TYPE,
+		UnsignedBigInt: NUMERIC_TYPE,
 
 		Enum:  TEXT_TYPE,
 		Set:   TEXT_TYPE,
@@ -280,10 +286,14 @@ var (
 // Type2SQLType generate SQLType acorrding Go's type
 func Type2SQLType(t reflect.Type) (st SQLType) {
 	switch k := t.Kind(); k {
-	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32:
+	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32:
 		st = SQLType{Int, 0, 0}
-	case reflect.Int64, reflect.Uint64:
+	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32:
+		st = SQLType{UnsignedInt, 0, 0}
+	case reflect.Int64:
 		st = SQLType{BigInt, 0, 0}
+	case reflect.Uint64:
+		st = SQLType{UnsignedBigInt, 0, 0}
 	case reflect.Float32:
 		st = SQLType{Float, 0, 0}
 	case reflect.Float64: