diff --git a/expression.go b/expression.go
index e2c52fc..82bf9ff 100644
--- a/expression.go
+++ b/expression.go
@@ -76,11 +76,6 @@ type NumberExpression interface {
 	Avg() NumberExpression
 	Min() UnknownExpression
 	Max() UnknownExpression
-
-	BitWiseAnd(other interface{}) NumberExpression
-	BitWiseOr(other interface{}) NumberExpression
-	BitWiseXor(other interface{}) NumberExpression
-	BitWiseNot() NumberExpression
 }
 
 // StringExpression is the interface of an SQL expression with string value.
@@ -539,23 +534,6 @@ func (e expression) Contains(substring string) BooleanExpression {
 	return function("LOCATE", substring, e).GreaterThan(0)
 }
 
-func (e expression) BitWiseAnd(other interface{}) NumberExpression {
-	return e.binaryOperation("&", other, 9, false)
-}
-
-func (e expression) BitWiseOr(other interface{}) NumberExpression {
-	return e.binaryOperation("|", other, 10, false)
-}
-
-func (e expression) BitWiseXor(other interface{}) NumberExpression {
-	return e.binaryOperation("^", other, 5, false)
-}
-
-func (e expression) BitWiseNot() NumberExpression {
-	return e.prefixSuffixExpression("~", "", 4, false)
-
-}
-
 func (e expression) binaryOperation(operator string, value interface{}, priority priority, isBool bool) expression {
 	return expression{builder: func(scope scope) (string, error) {
 		leftSql, err := e.GetSQL(scope)