Question

我有一张桌子：

sou_id  sou-name  rool_upid  roll_upname
1        AA          null       null
2        BB          null       null
3        CC          null       null
1        DD          null       null
2        EE          null       null
5        CC          null       null

我需要首先使用更新语句来获取 - 如果在roll_upid和roll_upname

中有多个名称我需要获取最多的名称

即。更新上面的表后应该有这样的价值

sou_id  sou-name  rool_upid  roll_upname
1        AA           1          DD
2        BB           2          EE
3        CC           3          CC
1        DD           1          DD
2        EE           2          EE
5        CC           5          CC

现在AGAIN检查并更新gor ----如果roll_upname相同而且roll_upid是多次占用最多。

我需要另一个更新语句。

因此，第二次更新后的决赛桌应该是这样的：

sou_id  sou-name  rool_upid  roll_upname
1        AA           1          DD
2        BB           2          EE
3        CC           5          CC
1        DD           1          DD
2        EE           2          EE
5        CC           5          CC

请尽快帮助我，我需要它提前谢谢

Answer 1

CREATE TABLE TABLE1
    (SOU_ID int, SOU_NAME varchar2(2), ROOL_UPID varchar2(4), ROLL_UPNAME varchar2(4));

INSERT ALL 
    INTO Table1 (SOU_ID, SOU_NAME, ROOL_UPID, ROLL_UPNAME)
         VALUES (1, 'AA', NULL, NULL)
    INTO Table1 (SOU_ID, SOU_NAME, ROOL_UPID, ROLL_UPNAME)
         VALUES (2, 'BB', NULL, NULL)
    INTO Table1 (SOU_ID, SOU_NAME, ROOL_UPID, ROLL_UPNAME)
         VALUES (3, 'CC', NULL, NULL)
    INTO Table1 (SOU_ID, SOU_NAME, ROOL_UPID, ROLL_UPNAME)
         VALUES (1, 'DD', NULL, NULL)
    INTO Table1 (SOU_ID, SOU_NAME, ROOL_UPID, ROLL_UPNAME)
         VALUES (2, 'EE', NULL, NULL)
    INTO Table1 (SOU_ID, SOU_NAME, ROOL_UPID, ROLL_UPNAME)
         VALUES (5, 'CC', NULL, NULL)
SELECT * FROM dual;

6 rows affected

update table1 t
set t.roll_upname = (select max(table1.sou_name) from table1 where table1.sou_id = t.sou_id)

6 rows affected

update table1 t
set t.rool_upid = (select max(table1.sou_id) from table1 where table1.roll_upname = t.roll_upname)

6 rows affected

select * from table1

SOU_ID | SOU_NAME | ROOL_UPID | ROLL_UPNAME
-----: | :------- | :-------- | :----------
     1 | AA       | 1         | DD         
     2 | BB       | 2         | EE         
     3 | CC       | 5         | CC         
     1 | DD       | 1         | DD         
     2 | EE       | 2         | EE         
     5 | CC       | 5         | CC

dbfiddle here

选择最大值

1 个答案: