列定義を保持したまま、行だけを削除する
DATAGRID_CLEARDATA関数
DATAGRID_CLEARDATA(dataGrid)
https://go.documentation.sas.com/doc/jp/edmcdc/v_056/edmdatagrids/n1shy8y4bvhh6gn112k7w50mpifx.htm
DATAGRID_CLEARDATA(dataGrid)
https://go.documentation.sas.com/doc/jp/edmcdc/v_056/edmdatagrids/n1shy8y4bvhh6gn112k7w50mpifx.htm