alias

\n alias用于设置当前数据表的别名，便于使用其他的连贯操作例如join方法等。\n\n示例：\n\n~~~\nDb::table('think_user')->alias('a')->join('__DEPT__ b ','b.user_id= a.id')->select();\n~~~\n最终生成的SQL语句类似于：\n\n~~~\nSELECT * FROM think_user a INNER JOIN think_dept b ON b.user_id= a.id\n~~~\n\n`v5.0.2+`版本开始，可以传入数组批量设置数据表以及别名，例如：\n~~~\nDb::table('think_user')->alias(['think_user'=>'user','think_dept'=>'dept'])->join('think_dept','dept.user_id= user.id')->select();\n~~~\n最终生成的SQL语句类似于：\n\n~~~\nSELECT * FROM think_user user INNER JOIN think_dept dept ON dept.user_id= user.id\n~~~\n