+----+------------+------------+------------+----------+
| id | phone_no | join_date | city | blood_gp |
+----+------------+------------+------------+----------+
| 1 | 80077672xx | 1997-07-19 | Delhi | NULL |
| 2 | 80077642xx | 1998-07-19 | New Delhi | NULL |
| 3 | 80477642xx | 1999-07-19 | Mumbai | NULL |
| 4 | 80077654xx | 1997-05-31 | Kolkata | NULL |
+----+------------+------------+------------+----------+
+----+------------+------------+------------+--
阅读背景：
如何为Mysql中的单个查询中的所有行插入一列的数据？
来源：互联网
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