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Person.count(:conditions=>"age > 26 AND job.salary > 60000",:include=>:job)# because of the named association, it finds the DISTINCT count using LEFT OUTER JOIN. Person.count(:conditions=>"age > 26 AND job.salary > 60000",:joins=>"LEFT JOIN jobs on jobs.person_id = person.id")#...
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SALARY float(8,2), RESUME LONGTEXT ); 查看表结构 desc EMPLOYEE; 在上面员工表的基本上增加一个image列。 alter table EMPLOYEE add (IMAGE longblob); 修改job列,使其长度为60。 alter table EMPLOYEE modify JOB varchar(60); 删除image列。