mslide サンプル1

入力データ
顧客 来店日 生年月日
customer1 19900115 19641222
customer1 19900131 19641222
customer1 19900521 19641222
customer1 19900611 19641222
customer2 19900122 19720103
customer2 19900521 19720103
customer2 19900801 19720103
customer3 19910303 19720103
customer4 * *
customer4 19900131 *
customer4 19900610 19900618
customer4 19900611 19900608

処理コマンド
mslide key=1 field=2

結果データ
顧客 来店日 生年月日 次回来店日
customer1 19900115 19641222 19900131
customer1 19900131 19641222 19900521
customer1 19900521 19641222 19900611
customer1 19900611 19641222 *
customer2 19900122 19720103 19900521
customer2 19900521 19720103 19900801
customer2 19900801 19720103 *
customer3 19910303 19720103 *
customer4 * * 19900131
customer4 19900131 * 19900610
customer4 19900610 19900618 19900611
customer4 19900611 19900608 *