type database/sql.NullString

4 uses

	database/sql (current package)
		sql.go#L188: type NullString struct {
		sql.go#L194: func (ns *NullString) Scan(value any) error {
		sql.go#L204: func (ns NullString) Value() (driver.Value, error) {

	github.com/go-pg/pg/v10/orm
		table.go#L48: 	nullStringType     = reflect.TypeOf((*sql.NullString)(nil)).Elem()