所有行的 LISTAGG 并在一次选择中生成哈希

Question

I have a query. This query looks for records from a table and writes them to a string. But the problem for me is this script only works for one key ( where t.keys = 'STIG6JGK' ) and not for all keys that are tables. I can't fix it.

select LISTAGG(t.DEVNAME , ',') WITHIN GROUP (ORDER BY 1) as alldev
from ( select t.DEVNAME,   
              row_number () over (partition by keys order by SEQUENCE) rn_asc     
       from ASU_DEVICES t
       where t.keys = 'STIG6JGK' 
) t 

But then I want it that will be in the "alldev" column, convert it to hash and write it in the column

SELECT DBMS_OBFUSCATION_TOOLKIT.md5 (input => UTL_RAW.cast_to_raw(alldev)) md5_val
FROM DUAL;

And then I want to write this file to the "HASH" table, in column 'key', and the 'hash'.

insert into hesh(key,hesh) VALUES ( t.keys ,md5_val)

This is all I want to do with one request or two, but for all keys at the same time. I would appreciate your help.

I just can't merge three different queries into one.

Answer 1

You can combine all of them using the following for all the KEYS :

INSERT INTO HESH (KEY, HESH)
    SELECT
        KEYS,
        DBMS_OBFUSCATION_TOOLKIT.MD5(INPUT => UTL_RAW.CAST_TO_RAW(ALLDEV))
    FROM
        ( SELECT T.KEYS,
                 LISTAGG(T.DEVNAME, ',') WITHIN GROUP( ORDER BY 1) AS ALLDEV
            FROM ASU_DEVICES T
        GROUP BY T.KEYS
        );

Update

You can use merge to achieve to update in the ecisting record as follows:

MERGE INTO HESH H
USING ( SELECT T.KEYS,
                     LISTAGG(T.DEVNAME, ',') WITHIN GROUP( ORDER BY 1) AS ALLDEV
                FROM ASU_DEVICES T
            GROUP BY T.KEYS
            ) SRC
ON (H.KEY = SRC.KEY)
WHEN MATCHED THEN
UPDATE SET H.HESH = DBMS_OBFUSCATION_TOOLKIT.MD5(INPUT => UTL_RAW.CAST_TO_RAW(ALLDEV));

Answer 2

I did it this way but didn't make a table entry

 with txn as ( select keys, hesh from ( select keys , LISTAGG(t.DEVNAME , ',') WITHIN GROUP (ORDER BY 1) as hesh from ( select t.keys, t.DEVNAME, row_number () over (partition by keys order by TO_NUMBER(SEQUENCE, '99')) rn_asc from ASU_DEVICES t ) t group by keys )) SELECT DBMS_OBFUSCATION_TOOLKIT.md5 (input => UTL_RAW.cast_to_raw(txn.hesh)) md5_val , txn.keys FROM txn;

As one solution to the problem, I think so, but it does not work

 UPDATE ASU_ROYTE SET hesh SELECT DBMS_OBFUSCATION_TOOLKIT.md5 (input => UTL_RAW.cast_to_raw(txn.hesh)) md5_val FROM txn WHERE ASU_ROYTE.keys = txn.keys