1、table 方法

　　原生sql方法

　　原生sql语法：select 表1.字段,表2.字段 from 表1as 别名1,表名2 as 别名 2 where 表1.字段 = 表2.字段;

　　select t1.*,t2.name as deptname from sp_user as t1,sp_dept as t2 where t1.dept_id = t2.id;

　　$model -> table(‘表名1[as 别名1],表名2[as 别名2]……‘);

　　$result = $model -> field(‘t1.*,t2.name as deptname‘) -> table(‘sp_user as t1,sp_dept as t2‘) -> where(‘t1.dept_id = t2.id‘) -> select();

2 、join方法

　　select 表1.字段，表2.字段 from 表1 as 别名[inner/left/right] join 表2 as 别名 on 表1.字段 = 表2.字段;

　　原生的sql：select t1.*,t2.name as deptname from sp_dept as t1 left join sp_dept as t2 on t1.pid;

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