Question

我有表Parent_tbl，它由3列H_N，Col58和Type组成，前两列将具有相同的值，只有列类型不同。

我有一个子表，其中col58定义了与父项的关系，但是child_tbl中的其余列仅特定于该表，H_N是两个表中的唯一列。

我需要在PARENT_TBL中将TYPE更新为EXCHANGE，当我发现CHILD_TBL I_STATUS具有S，R和V等所有值时，否则parent_tbl类型保持不变，我们该怎么做？

Parent_tbl.col58 = 1140该类型应为'EXCHANGE'，因为child_tbl.col58 = 1140具有每个字母，即S，R，V。

这是样本的DDL。

CREATE TABLE PARENT_TBL (
    H_N number, 
    col58 number,
    TYPE varchar(100)
);
Insert into PARENT_TBL (H_N,COL58,TYPE) values (2,2,'SALE');
Insert into PARENT_TBL (H_N,COL58,TYPE) values (16,16,'SALE');
Insert into PARENT_TBL (H_N,COL58,TYPE) values (20,20,'SALE');
Insert into PARENT_TBL (H_N,COL58,TYPE) values (34,34,'VOID');
Insert into PARENT_TBL (H_N,COL58,TYPE) values (38,38,'SALE');
Insert into PARENT_TBL (H_N,COL58,TYPE) values (102,102,'SALE');
Insert into PARENT_TBL (H_N,COL58,TYPE) values (111,111,'SALE');
Insert into PARENT_TBL (H_N,COL58,TYPE) values (117,117,'SALE');
Insert into PARENT_TBL (H_N,COL58,TYPE) values (1140,1140,'RETURN');
Insert into PARENT_TBL (H_N,COL58,TYPE) values (131,131,'SALE');

commit;

CREATE TABLE CHILD_TBL
(
    I_STATUS varchar(100),
    H_n number,
    col58 number
);


Insert into CHILD_TBL (I_STATUS,H_N,COL58) values ('S',3,2);
Insert into CHILD_TBL (I_STATUS,H_N,COL58) values ('S',5,2);
Insert into CHILD_TBL (I_STATUS,H_N,COL58) values ('S',7,2);
Insert into CHILD_TBL (I_STATUS,H_N,COL58) values ('S',8,2);
Insert into CHILD_TBL (I_STATUS,H_N,COL58) values ('S',10,2);
Insert into CHILD_TBL (I_STATUS,H_N,COL58) values ('S',1141,1140);
Insert into CHILD_TBL (I_STATUS,H_N,COL58) values ('V',1142,1140);
Insert into CHILD_TBL (I_STATUS,H_N,COL58) values ('R',1143,1140);
Insert into CHILD_TBL (I_STATUS,H_N,COL58) values ('R',1144,1140);
Insert into CHILD_TBL (I_STATUS,H_N,COL58) values ('S',1145,1140);

commit;

预期输出：

  truncate table PARENT_TBL ;
     Insert into PARENT_TBL (H_N,COL58,TYPE) values (2,2,'SALE');
        Insert into PARENT_TBL (H_N,COL58,TYPE) values (16,16,'SALE');
        Insert into PARENT_TBL (H_N,COL58,TYPE) values (20,20,'SALE');
        Insert into PARENT_TBL (H_N,COL58,TYPE) values (34,34,'VOID');
        Insert into PARENT_TBL (H_N,COL58,TYPE) values (38,38,'SALE');
        Insert into PARENT_TBL (H_N,COL58,TYPE) values (102,102,'SALE');
        Insert into PARENT_TBL (H_N,COL58,TYPE) values (111,111,'SALE');
        Insert into PARENT_TBL (H_N,COL58,TYPE) values (117,117,'SALE');
        Insert into PARENT_TBL (H_N,COL58,TYPE) values (1140,1140,**'EXCHANGE'**);
        Insert into PARENT_TBL (H_N,COL58,TYPE) values (131,131,'SALE');

Answer 1

使用此

update PARENT_TBL p
set TYPE='EXCHANGE'
where exists 
( select 1
    from child_tbl c
    where
    i_status in ('S','R','V')
    and c.col58=p.col58
     group by col58
     having count(distinct(i_status))=3
)

说明：

select col58 
from child_tbl c
where
  i_status in ('S','R','V')
  group by col58
  having count(distinct(i_status))=3

这会在过滤器col58之后为count(distinct(i_status))=3提供i_status in ('S','R','V')。因此，只有3的每个状态至少为1时才会'S','R','V'。现在在exists子句中使用它并添加上述查询and c.col58=p.col58中的where条件，以便在更新时将其与parent表连接。

请首先尝试测试数据并尝试此操作而不提交原始数据。只有当您确定获得预期结果时才提交。

Answer 2

使用适当的分组查找子表（CHILD_TBL）中的行并使用merge：

merge into parent_tbl p
using (select col58 
         from child_tbl
         group by col58
         having count(decode(i_status, 'S', 1)) > 0 
            and count(decode(i_status, 'R', 1)) > 0
            and count(decode(i_status, 'V', 1)) > 0) c
on (p.col58 = c.col58)
when matched then update set type = 'EXCHANGE'

考虑oracle中子表的值来更新父表

2 个答案: