为什么分期比全款便宜

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SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1071935,1087337,1087509,1317787,1127070,387575,1422518,1305039,167056,1093799,1922415,1842199,2451054,1070624,554993,3238215,1999130,1112266,1445310,2810860,1580318,1098547,2145489,1095930,243188,1100985,1666959,1465035,1111742,1709414) ORDER BY field (ArticleID,1071935,1087337,1087509,1317787,1127070,387575,1422518,1305039,167056,1093799,1922415,1842199,2451054,1070624,554993,3238215,1999130,1112266,1445310,2810860,1580318,1098547,2145489,1095930,243188,1100985,1666959,1465035,1111742,1709414)