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select * from a; +------+------+------+ 发器
| id | name | age | +------+------+------+

| 1 | A1 | 10 | | 2 | A2 | 20 | +------+------+------+
发器mysql >select * from b; +------+------+------+
发器| rid | id | age | +------+------+------+ | 5 | 2 | 20 | +------+------+------+ 1.2.3.4.5.随机阅读
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