关键字 row_number() over (partition by)

例如，下面的数据， 这是按照name分组后，展示property值。

我们想得到这样的值;

第一步：将每一组的property标上序号

select name,property,row_number() over (partition by name order by property desc) column_num from test

得到的结果:

partition by 后面接的就应该是将要分组的字段。如果partition by property 相当于按照property分组，那么后面的列序号column_num就是1，1，1，1，1，1，1

	select  b.MineID,b.MineName,b.economy,b.address,MAX(CASE WHEN num = 1 THEN name END) AS value1,MAX(CASE WHEN num = 1 THEN jobType END) AS jobType1,MAX(CASE WHEN num = 1 THEN mobile END) AS phone1,MAX(CASE WHEN num = 2 THEN name END) AS value2,MAX(CASE WHEN num = 2 THEN jobType END) AS jobType2,MAX(CASE WHEN num = 2 THEN mobile END) AS phone2,MAX(CASE WHEN num = 3 THEN name END) AS value3,MAX(CASE WHEN num = 3 THEN jobType END) AS jobType3,MAX(CASE WHEN num = 3 THEN mobile END) AS phone3,MAX(CASE WHEN num = 4 THEN name END) AS value4,MAX(CASE WHEN num = 4 THEN jobType END) AS jobType4,MAX(CASE WHEN num = 4 THEN mobile END) AS phone4,MAX(CASE WHEN num = 5 THEN name END) AS value5,MAX(CASE WHEN num = 5 THEN jobType END) AS jobType5,MAX(CASE WHEN num = 5 THEN mobile END) AS phone5,MAX(CASE WHEN num = 6 THEN name END) AS value6,MAX(CASE WHEN num = 6 THEN jobType END) AS jobType6,MAX(CASE WHEN num = 6 THEN mobile END) AS phone6,MAX(CASE WHEN num = 7 THEN name END) AS value7,MAX(CASE WHEN num = 7 THEN jobType END) AS jobType7,MAX(CASE WHEN num = 7 THEN mobile END) AS phone7,MAX(CASE WHEN num = 8 THEN name END) AS value8,MAX(CASE WHEN num = 8 THEN jobType END) AS jobType8,MAX(CASE WHEN num = 8 THEN mobile END) AS phone8,MAX(CASE WHEN num = 9 THEN name END) AS value9,MAX(CASE WHEN num = 9 THEN jobType END) AS jobType9,MAX(CASE WHEN num = 9 THEN mobile END) AS phone9,MAX(CASE WHEN num = 10 THEN name END) AS value10,MAX(CASE WHEN num = 10 THEN jobType END) AS jobType10,MAX(CASE WHEN num = 10 THEN mobile END) AS phone10from (select a.*,row_number() over (partition by a.MineName order by a.job_id asc) num from   (selectm.MineID,m.MineName,dic.LABEL economy,t.ADDRESS address,a.job_id, person_name name,mobile,if (a.job_id is null,a.job,b.dic_name) jobTypefrom m_mine_keeper_info aLEFT JOIN k_dictionary b on b.dic_code=a.job_id and b.dic_type='JobType'	left join k_mine m on m.MineID=a.MineIdleft join t_aj1_mj_jcxx_baseinfo t on t.CORP_ID=m.MineID and t.DEL_FLAG=0left join jcxx_sys_dict dic on dic.`VALUE`=t.ECONOMY_TYPE and dic.TYPE='base_economy_type'where  ( a.is_deleted=0 or a.is_deleted is null ) and a.job_id is not null ) a) b group by MineName