我有一个名为 tblData 的表,其中包含以下数据。
查询前:
ID DisplayNum Called
1 A1 NULL
2 A1 NULL
3 A1 NULL
4 B4 NULL
5 B4 NULL
我现在有了:
UPDATE TOP (1) tblData SET Called = GETDATE() WHERE DisplayNum = @DisplayNo AND Called IS NULL
ID DisplayNum Called
1 A1 7/1/2013 9:00 AM
2 A1 7/1/2013 9:00 AM
3 A1 7/1/2013 9:00 AM
4 B4 7/1/2013 9:30 AM
5 B4 7/1/2013 9:30 AM
我只想更新那个特定 DisplayNum 调用为空的顶级记录
ID DisplayNum Called
1 A1 7/1/2013 9:00 AM
2 A1 7/1/2013 9:05 AM
3 A1 7/1/2013 9:08 AM
4 B4 7/1/2013 9:20 AM
5 B4 7/1/2013 9:26 AM
当该特定组的不同 ID 时,我如何获得它?