MySQL - 选择ID下的行，按列值选择具有最新时间戳的行

Table:

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ID | field_name | field_value | timestamp
----------------------------------------------------
2  | postcode   | LS1         | 2016-11-09 16:45:15
2  | age        | 34          | 2016-11-09 16:45:22
2  | job        | Scientist   | 2016-11-09 16:45:27
2  | age        | 38          | 2016-11-09 16:46:40
7  | postcode   | LS5         | 2016-11-09 16:47:05
7  | age        | 24          | 2016-11-09 16:47:44    
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