select even列是null oracle

Question

以下命令是我的sql select命令;

sqlcommand = "SELECT * FROM INVENTORY WHERE LOWER(SAPNO) LIKE LOWER('" + sapNo + "%') AND LOWER(PARTDESC) LIKE LOWER('" + partDesc + "%') AND LOWER(PARTNO) LIKE LOWER('" + partNo + "%') AND MINQTY = '" + minQty + "' AND QOH = '" + QOH + "' AND LOWER(CATEGORY) LIKE LOWER('" + category + "%') AND LOWER(EQUIPMENT) LIKE LOWER('" + equipment + "%')";

像类别和设备的例子是确认无效。其余的都有价值。即使类别和设备为空，如何选择行？因为只要设备和类别为空，我就会使用此注释，数据将不会显示！

非常感谢您的评论!! TQ

Answer 1

您可以添加一些OR条件，以便返回可以使特定值为null的行。

AND (LOWER(CATEGORY) LIKE LOWER('" + category + "%') OR CATEGORY IS NULL) AND (LOWER(EQUIPMENT) LIKE LOWER('" + equipment + "%') OR EQUIPMENT IS NULL)