Question

我正在尝试根据行数更新sql中的列SortOrder。列名是SortOrder，ASP.net将显示列＆quot; reportdisplayname＆＃39;基于排序顺序。＆＃39; reportdisplayname＆＃39;列全部分组。在下面，reportdisplayname有数据＆＃39; FADMS - 测试＆＃39; FADMS - 主题＆＃39;。 sortorder的想法是一起显示相似的值。所以，＆＃39; FADMS - 主题＆＃39;将出现在FADMS - 测试＆＃39;。

之后

UPDATE managementreports
SET sortorder = rownum
where eventid = 'xxxxx';

UPDATE managementreports SET sortorder = 9
where eventid = 'xxx' and reportdisplayname = 'FADMS - Test';

UPDATE managementreports SET sortorder = 10
where eventid = 'xxx' and reportdisplayname = 'Results - xxx';

UPDATE managementreports
SET sortorder = sortorder + 1
where eventid = 'xxx' and sortorder > 10;

有没有更好的方法来做到这一点。目前，我为新字段设置了排序顺序＆＃39; FADMS - 测试＆＃39;，然后将现有无关字段的排序顺序更新为1.

Answer 1

是的，您可以使用CASE表达式一次更新所有内容，如下所示：

UPDATE managementreports
SET sortorder = CASE 
                    WHEN eventid = 'xxxxx' THEN rownum
                    WHEN eventid = 'xxx' AND reportdisplayname = 'FADMS - Test' THEN 9
                    WHEN eventid = 'xxx' AND reportdisplayname = 'Results - xxx' THEN 10
                    WHEN eventid = 'xxx' AND sortorder > 10 THEN (sortorder + 1)
                    ELSE sortorder
                END

基于groupby更新SQL中的列

1 个答案: