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数据库-关于原生mysql语句多表查询更新字段问题 求大神解答

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Release： 2016-06-06 09:43:18
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mysql数据库

如题：
a表
user_id school_id
1233 22013
2346 22017
2344 23445
2247 22017
... ...

b表
user_id term
2346 1
2346 1
2346 2
2247 2
1233 1
... ...

如上两张表：
根据a表中的school_id=22017 得到它的user_id 然后根据此user_id得到b表中的term

并把term=1的变为term=2，把term=2的变为term=1

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mysql 数据库
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