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如何編寫查詢以顯示每個用戶的最新位置,類似於我的顯示方式?我四處搜索,但仍未能正確實施。我將如何查詢,以便顯示每個用戶最近的位置
+----------+-----------+----------+-----------+-------------------------+
| Username | Firstname | Lastname | Location | DateandTime |
+----------+-----------+----------+-----------+-------------------------+
| ms | mark | smith | labs | 2017-05-04 15:35:00.000 |
| jb | james | brown | home | 2017-05-04 18:55:00.000 |
| cj | charlie | jones | uni | 2017-05-04 18:56:00.000 |
| cj | charlie | jones | home | 2017-05-04 19:33:00.000 |
| ms | mark | smith | shop | 2017-05-05 15:40:00.000 |
| jb | james | brown | somewhere | 2017-05-05 16:31:00.000 |
| ms | mark | smith | work | 2017-05-07 17:42:00.000 |
| ms | mark | smith | market | 2017-05-07 17:45:00.000 |
+----------+-----------+----------+-----------+-------------------------+
+----------+-----------+----------+-----------+-------------------------+
| Username | Firstname | Lastname | Location | DateandTime |
+----------+-----------+----------+-----------+-------------------------+
| cj | charlie | jones | home | 2017-05-04 19:33:00.000 |
| jb | james | brown | somewhere | 2017-05-05 16:31:00.000 |
| ms | mark | smith | market | 2017-05-07 17:45:00.000 |
+----------+-----------+----------+-----------+-------------------------+
通過@Gurwinder辛格其他答案是比我更好。 :) – GandRalph
我不知道我認爲適用更有效率。 – xQbert