试题
表数据：table1：
id name name_wt cert cert_wt
--------------------------------------------
A12510
A2477
Ba3Ha11
Bb999C10
查询结果：table2
id name name_wt cert cert_wt
--------------------------------------------
A1277
Ba3C10
请根据table2的要求，通过编写SQL语句实现：根据ID分组，每个字段值对应的WT最小。
答案：
select A.id, A.name, A.name_wt, B.cert, B.cert_wt
from (select *
from (select t1.id,
t1.name,
t1.name_wt,
row_number() over(partition by id order by to_number(t1.name_wt) asc) unit_id
from table1t1)
where unit_id = 1) A
left join (select *
from (select t1.id,
t1.cert,
t1.cert_wt,
row_number() over(partition by id order by to_number(t1.cert_wt) asc) unit_id
from table1t1)
where unit_id = 1) B
on a.id = b.id