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201308/20130806_01.md

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@@ -162,6 +162,7 @@ digoal=# select * from (select *,ST_Distance(jwd, ST_Transform(ST_GeomFromText('
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## 极致优化
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进一步优化, 使用游标, 可以将数据扫描降到极限. (前提是for循环中的sql order by使用了索引)
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```

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