如何根據條件對數據進行分組並依次對這些組進行編號？

Question

我有一個數據：

with t as 
(select 1 as id, '1324345' as amount, 7821 as code 
    from dual 
    union all 
    select 2 as id, 'current' as amount, 2210 as code 
    from dual 
    union all 
    select 3 as id, 'link' as amount, 2210 as code 
    from dual 
    union all 
    select 4 as id, '56236400' as amount, 6740 as code 
    from dual 
    union all 
    select 5 as id, '45562330' as amount, 5578 as code 
    from dual 
    union all 
    select 6 as id, '34875930' as amount, 5828 as code 
    from dual 
    union all 
    select 7 as id, 'current' as amount, 8520 as code 
    from dual 
    union all 
    select 8 as id, 'link' as amount, 8520 as code 
    from dual 
    union all 
    select 9 as id, '6731347060' as amount, 4740 as code 
    from dual 
    union all 
    select 10 as id, '346008600' as amount, 6575 as code 
    from dual) 
select * from t 

，我希望得到以下幾點：

with t as 
(select 1 as id, '1324345' as amount, 7821 as code, 1 as group_id 
    from dual 
    union all 
    select 2 as id, 'current' as amount, 2210 as code, 2 as group_id 
    from dual 
    union all 
    select 3 as id, 'link' as amount, 2210 as code, 2 as group_id 
    from dual 
    union all 
    select 4 as id, '56236400' as amount, 6740 as code, 3 as group_id 
    from dual 
    union all 
    select 5 as id, '45562330' as amount, 5578 as code, 3 as group_id 
    from dual 
    union all 
    select 6 as id, '34875930' as amount, 5828 as code, 3 as group_id 
    from dual 
    union all 
    select 7 as id, 'current' as amount, 8520 as code, 4 as group_id 
    from dual 
    union all 
    select 8 as id, 'link' as amount, 8520 as code, 4 as group_id 
    from dual 
    union all 
    select 9 as id, '6731347060' as amount, 4740 as code, 5 as group_id 
    from dual 
    union all 
    select 10 as id, '346008600' as amount, 6575 as code, 5 as group_id 
    from dual) 
select * from t 

的條件是「量」字段的值。它可能是數字或文字。

UPD：預期結果：

id | amount  | code | group_id 
--------------------------------------------- 
1 | 1324345  | 7821 |  1 
--------------------------------------------- 
2 | current  | 2210 |  2 
--------------------------------------------- 
3 | link  | 2210 |  2 
--------------------------------------------- 
4 | 56236400 | 6740 |  3 
--------------------------------------------- 
5 | 45562330 | 5578 |  3 
--------------------------------------------- 
6 | 34875930 | 5828 |  3 
--------------------------------------------- 
7 | current  | 8520 |  4 
--------------------------------------------- 
8 | link  | 8520 |  4 
--------------------------------------------- 
9 | 6731347060 | 4740 |  5 
--------------------------------------------- 
10 | 346008600 | 6575 |  5 
--------------------------------------------- 

編輯：最好的解決辦法：

with tmain as 
(select t.*, 
     decode(isnumeric(Amount), 
       lag(isnumeric(Amount)) over(order by id), 
       null, 
       1) lg 
    from t 
    order by id) 
select id, amount, code, count(lg) over(order by id) group_id from tmain 

凡ISNUMERIC功能（基於@valexhome答案）：

CREATE OR REPLACE FUNCTION ISNUMERIC (Str IN CHAR) RETURN NUMBER AS 
    TMP int; 
BEGIN 
    if Str is null then 
     return(null); 
    end if; 
    TMP:=TO_NUMBER(Str); 
    RETURN (1); 
EXCEPTION 
    WHEN OTHERS THEN 
     RETURN (0); 
END; 

Answer 1

這裏是功能ISNUMERIC到查詢運行之前定義：

CREATE OR REPLACE FUNCTION ISNUMERIC (Str IN CHAR) RETURN NUMBER AS 
    TMP int; 
BEGIN 
    if Str is null then 
     return(null); 
    end if; 
    --if input null return NULL 
    TMP:=TO_NUMBER(Str); 
    RETURN (1); 
EXCEPTION 
    WHEN OTHERS THEN 
     RETURN (0); 
END; 

這裏是查詢：

select id, amount, code, 
(
select count(id) 
from t Tab 
where tab.id<=t.id 
    and 
    isnumeric(Amount)<>nvl(isnumeric((select Amount from t d1 where d1.id=(select max(d.id) from t d where (d.id<Tab.id)))),isnumeric(Amount)-1) 
) Group_id 

from t order by id 

Answer 2

我找到了另一種解決方案：

with tmain as 
(select t.*, 
     decode(isnumeric(Amount), 
       lag(isnumeric(Amount)) over(order by id), 
       null, 
       1) lg 
    from t 
    order by id) 
select id, amount, code, count(lg) over(order by id) group_id from tmain 

它適用於大量數據的罰款。