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mysql:去除重复行，重复行相加，并修改表。

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Release： 2016-06-06 09:44:07
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mysql

| 冷水江 | 0.076923 |
| 一 | 0.076923 |
| 煤矿 | 0.076923 |
| 发生 | 0.076923 |
| 瓦斯 | 0.076923 |
| 爆炸 | 0.076923 |
| 事故 | 0.076923 |
| 南京 | 0.076923 |
| 一 | 0.076923 |
以上是原始表；
目标表：
| 冷水江 | 0.076923 |
| 一 | 0.153865 |
| 煤矿 | 0.076923 |
| 发生 | 0.076923 |
| 瓦斯 | 0.076923 |
| 爆炸 | 0.076923 |
| 事故 | 0.076923 |
| 南京 | 0.076923 |

即将重复的“一”相加并修改表。
大家帮帮忙，谢谢。

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