建表:spa
CREATE TABLE `my_tb` ( `id` int(11) NOT NULL AUTO_INCREMENT, `parent_code` varchar(255) DEFAULT NULL, `code` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8;
初始數據:code
INSERT INTO `my_tb` ( `parent_code`, `code`) VALUES ('01', '001'); INSERT INTO `my_tb` ( `parent_code`, `code`) VALUES ('01', '002'); INSERT INTO `my_tb` ( `parent_code`, `code`) VALUES ('02', '001'); INSERT INTO `my_tb` ( `parent_code`, `code`) VALUES ('01', '003'); INSERT INTO `my_tb` ( `parent_code`, `code`) VALUES ('02', '002'); INSERT INTO `my_tb` ( `parent_code`, `code`) VALUES ('03', '001'); INSERT INTO `my_tb` ( `parent_code`, `code`) VALUES ('04', '001');
查詢行號:blog
-- 生成 行號 select @r:=@r+1 as row_num , a.* from my_tb a ,(select @r:=0) b
顯示分組號:排序
-- 生成 分組排序號 select @group_row:=CASE when @parent_code=a.parent_code then @group_row+1 else 1 end as groupRow, @parent_code:=a.parent_code as parent_code, a.code from my_tb a ,( select @group_row:=1, @parent_code:='') as b ORDER BY a.parent_code , a.code