Question

我的表格数据如下。我必须找到hh_num列刚刚打印出第三列的预期结果，如下所示。

$value_to_display = $dataArray['some_index_value']['value'];

我会写一个如下的查询。

当rel = 0时的情况hh_num与row_num相同但是当rel＆lt;＆gt; 0然后hh_num将是row_num的最大值，其中rel = 0但小于当前行数。

row_num rel_no  hh_num
1        0        1
2        6        1
3        8        1
4        0        4
5        0        5
6        0        6
7        2        6
8        3        6
9        6        6
10       0       10

Answer 1

create temp table table1 (
row_num int
,rel_no int
,hh_num int

);

insert into table1
select 1,        0,        null
union all
select 2,        6,        null
union all
select 3,        8,        null
union all
select 4,        0,        null
union all
select 5,        0,        null
union all
select 6,        0,        null
union all
select 7,        2,        null
union all
select 8,        3,        null
union all
select 9,        6,        null
union all
select 10,       0,       null;   

 update table1 a set hh_num = sub.hh_num
 from
 (select h.rowid as rown, h.row_num, h.rel_no, max(p.row_num) as hh_num
 from table1 h inner join
 table1 p
 on p.rel_no = 0 and p.row_num <h.row_num
 group by h.rowid, h.row_num, h.rel_no) sub
 where a.rowid=sub.rown;

  update table1 set hh_num = row_num
 where rel_no = 0;

适用于Oracle或sybase，但不适用于netezza。获取错误错误：（2）不支持这种形式的相关查询 - 考虑重写

1 个答案: