使用oracle数据库筛选sql

fkaflof6  于 2021-07-24  发布在  Java
关注(0)|答案(3)|浏览(283)

我想知道以下是否可行
例如,我有一家鞋厂。在这家工厂我有一条生产线,这条生产线的每一步都被记录到oracle数据库中。
如果清选筛已完成生产步骤,则结果为=1
示例表

Shoe_nr    production step      result
1              1                 1 
1              2                 1
1              3
2              1                 1
2              2                 1 
2              3               
3              1 
3              2 
3              3

现在的问题是,有没有可能过滤掉生产步骤3,其中只有鞋子通过了生产步骤2,结果等于1。
我知道如果能做到这一点可能很容易,但如果你不知道我发现这有点棘手。
谢谢,
克里斯

jpfvwuh4

jpfvwuh41#

是的,你可以用in和subselect来做

select * 
from shoes
where shoe.id in (
    select shoe.id
    from shoes
    where production_step = 2
    and result = 1
)
and production_step = 3
rdlzhqv9

rdlzhqv92#

这可能是一种选择;参见代码中的注解(第1-12行表示示例数据;你已经有了,别打了。您可能感兴趣的查询从第13行开始。

SQL> with shoes (shoe_nr, production_step, result) as
  2  -- sample data
  3    (select 1, 1, 1    from dual union all
  4     select 1, 2, 1    from dual union all
  5     select 1, 3, null from dual union all
  6     select 2, 1, 1    from dual union all
  7     select 2, 2, 1    from dual union all
  8     select 2, 3, null from dual union all
  9     select 3, 1, null from dual union all
 10     select 3, 2, null from dual union all
 11     select 3, 3, null from dual
 12    ),
 13  -- which shoes' production step #3 should be skipped?
 14  skip as
 15    (select shoe_nr
 16     from shoes
 17     where production_step = 2
 18       and result = 1
 19    )
 20  -- finally:
 21  select a.shoe_nr, a.production_step, a.result
 22  from shoes a
 23  where (a.shoe_nr, a.production_step) not in (select b.shoe_nr, 3
 24                                               from skip b
 25                                              )
 26  order by a.shoe_nr, a.production_step;

   SHOE_NR PRODUCTION_STEP     RESULT
---------- --------------- ----------
         1               1          1
         1               2          1
         2               1          1
         2               2          1
         3               1
         3               2
         3               3

7 rows selected.

SQL>
1cosmwyk

1cosmwyk3#

如果你只是想 shoe_nr 如果满足条件,可以使用聚合和 having 条款:

select shoe_nr
from mytable
group by shoe_nr
having 
    max(case when production_step = 2 then result end) = 0
    and max(case when production_step = 3 then 1 end) = 1

如果你想让整行都和这个对应 shoe_nr 在步骤3中,请改用窗口函数:

select 1
from (
    select 
        t.*, 
        max(case when production_step = 2 then result end) 
            over(partition by shoe_nr) as has_completed_step_2
    from mytable t
) t
where production_step = 3 and has_completed_step_2 = 0

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