ORA-01407: cannot update to null 错误解决

ORA-01407: cannot update to null 错误解决

在更新客户数据时 出现ORA-01407错误

SQL> select table_id,game_deal_log_id from tb_test_log;

TABLE_ID GAME_DEAL_LOG_ID
---------- ----------------
G 0
10001 4923601
AA 4923676
BB 4923672
CC 4923677
DD 4923674
FF 4923673
GG 4923671
HH 2616668
II 4923668
C 0
D 0
E 0
F 0

14 rows selected

SQL> select * from test;

GAME_DEAL_LOG_ID TABLE_ID
---------------- ----------
4661667 10001
4661556 AA
4661558 BB
4661559 CC
4661553 DD
4661552 FF
4661555 GG
2616668 HH
4661557 II

9 rows selected

SQL>
SQL> update tb_test_log a
2 set game_deal_log_id = (select game_deal_log_id
3 from test b
4 where a.table_id = b.table_id);

update tb_adjustment_handledeal_log a
set game_deal_log_id = (select game_deal_log_id
from test b
here a.table_id = b.table_id)
ORA-01407: cannot update ("TEST"."TB_TEST_LOG"."GAME_DEAL_LOG_ID") to NULL

这是因为上面sql运行时 会更新所有game_deal_log_id字段 下面我删除不相等的table_id

QL> delete from tb_test_log where table_id in ('C','D','E','F','G');

5 rows deleted

SQL>
SQL> update tb_test_log a
2 set game_deal_log_id = (select game_deal_log_id
from test b
4 where a.table_id = b.table_id);

9 rows updated

更新成功 这个sql就只能保证两边数据记录一致 才能更新成功

SQL> select table_id,game_deal_log_id from tb_test_log;

TABLE_ID GAME_DEAL_LOG_ID
---------- ----------------
10001 4661667
AA 4661556
BB 4661558
CC 4661559
DD 4661553
FF 4661552
GG 4661555
HH 2616668
II 4661557

9 rows selected

SQL> rollback;

Rollback complete

SQL>

所以上面sql还是写的有问题,没有真正关联到相等的table_id,采取如下写法就是正确的写法
SQL> update tb_test_log a
2 set game_deal_log_id = (select game_deal_log_id
3 from test b
4 where a.table_id = b.table_id)
5 where exists (select 1 from test b where a.table_id=b.table_id);

9 rows updated

SQL> select table_id,game_deal_log_id from tb_test_log;

TABLE_ID GAME_DEAL_LOG_ID
---------- ----------------
G 0
10001 4661667
AA 4661556
BB 4661558
CC 4661559
DD 4661553
FF 4661552
GG 4661555
HH 2616668
II 4661557
C 0
D 0
E 0
F 0

14 rows selected