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mysql-MYSQL查询问题，求助？

WBOY
Release： 2016-06-06 09:33:31
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mysqlsql

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我想得到：
extension_id a（report_type=0） b（report_type=1）
4 0 1
5 1 1
6 2 0

<code>求助sql语句如何写？</code>
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mysql sql
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