Question

enter image description here如何从一个表复制列值并将相同的值作为一行存储到另一个表中。

我有两个表，一个是firsttbl，第二个是testtbl。然后第一个表有更多记录，第二个表需要在第一个表中复制相同的值。

下面的firsttbl原始记录 enter image description here

CORRELATION_ID                      NAME            VALUE            TYPE             OBJECT_ID   ARCHIVE_FLAG  ARCHIVE_DATE WF_ID          REC_TIME     KEY_ID VALUE_UPPER
43344255015b9b192916node1   TransactionSenderID    SANMINACORT  DOCUMENT    14804515b9b1924f9node1  -1              null    1912341 2017-04-23 08:56:09.0   20  SANMINACORT
43391255115b9b192916node1   TransactionReceiverID    4017395800 DOCUMENT    14804515b9b1924f9node1  -1              null    1912341 2017-04-23 08:56:09.0   21  4017395800
43376255215b9b192916node1   Level                   Transaction DOCUMENT    14804515b9b1924f9node1  -1              null    1912341 2017-04-23 08:56:09.0   41  TRANSACTION
43399255315b9b192916node1   GroupSenderID         SANMINACORT   DOCUMENT    14804515b9b1924f9node1  -1              null    1912341 2017-04-23 08:56:09.0   28  SANMINACORT
43356255415b9b192916node1   GroupReceiverID        4017395800   DOCUMENT    14804515b9b1924f9node1  -1              null    1912341 2017-04-23 08:56:09.0   30  4017395800

仅创建了第二个表尚未存储在任何值中。

 TransactionSenderID   TransactionReceiverID   Level   GroupSenderID   GroupReceiverID

第二个表库名已经存储在NAME coulmn下的firsttbl中。

我要从firsttbl表复制记录，因此firsttbl列名称VALUE所有5个值都需要作为一行存储在第二个表（testtbl）中。这个查询我尝试但尚未成功。

INSERT INTO testtbl(TransactionSenderID,TransactionReceiverID,Level,GroupSenderID,GroupReceiverID) Select value from firsttbl;

这是PostgreSQL中的错误。

错误：INSERT的目标列多于表达式LINE 1：INSERT   INTO testtbl（TransactionSenderID，TransactionReceiverI ......                                                   ^

**********错误**********

错误：INSERT的目标列多于表达式SQL状态：   42601字符：41

Answer 1

这看起来像一个支点/组聚合问题。我没有postgresql，但因为问题是标记mysql这里是一个mysql解决方案（如果问题是postgresql，方法应该类似）

drop table if exists t;
create table t (
CORRELATION_ID varchar(30), NAME varchar(30),VALUe varchar(30), TYPE VARCHAR(30), OBJECT_ID VARCHAR(30), ARCHIVE_FLAG VARCHAR(30), 
ARCHIVE_DATE datetime, WF_ID int, REC_TIME datetime, KEY_ID int, VALUE_UPPER varchar(20));
insert into t values
('43344255015b9b192916node1', 'TransactionSenderID' ,'SANMINACORT' ,'DOCUMENT' ,'14804515b9b1924f9node1', '-1' ,null ,1912341 ,'2017-04-23 08:56:09.0', 20 ,'SANMINACORT'), 
('43391255115b9b192916node1', 'TransactionReceiverID' ,'4017395800' ,'DOCUMENT' ,'14804515b9b1924f9node1', '-1' ,null ,1912341 ,'2017-04-23 08:56:09.0' ,21 ,'4017395800' ),
('43376255215b9b192916node1', 'Level', 'Transaction', 'DOCUMENT' ,'14804515b9b1924f9node1' ,'-1' ,null ,1912341 ,'2017-04-23 08:56:09.0', 41 ,'TRANSACTION' ),
('43399255315b9b192916node1', 'GroupSenderID' ,'SANMINACORT', 'DOCUMENT' ,'14804515b9b1924f9node1' ,'-1' ,null ,1912341 ,'2017-04-23 08:56:09.0' ,28, 'SANMINACORT'), 
('43356255415b9b192916node1', 'GroupReceiverID', '4017395800', 'DOCUMENT' ,'14804515b9b1924f9node1' ,'-1' ,null ,1912341 ,'2017-04-23 08:56:09.0',30, '4017395800');

drop table if exists t2;
create table t2(wf_id int,TransactionSenderID varchar(20),  TransactionReceiverID varchar(20),  Level varchar(20),  GroupSenderID varchar(20),  GroupReceiverID varchar(20));

insert into t2
select wf_id, 
        max(case when name = 'TransactionSenderID' then value else null end),
        max(case when name = 'TransactionReceiverID' then value else null end),
        max(case when name = 'Level' then value else null end),
        max(case when name = 'GroupSenderID' then value else null end),
        max(case when name = 'GroupReceiverID' then value else null end)
from t 
group by wf_id;

select * from t2;

MariaDB [sandbox]> select * from t2;
+---------+---------------------+-----------------------+-------------+---------------+-----------------+
| wf_id   | TransactionSenderID | TransactionReceiverID | Level       | GroupSenderID | GroupReceiverID |
+---------+---------------------+-----------------------+-------------+---------------+-----------------+
| 1912341 | SANMINACORT         | 4017395800            | Transaction | SANMINACORT   | 4017395800      |
+---------+---------------------+-----------------------+-------------+---------------+-----------------+
1 row in set (0.00 sec)

如何从一个表复制列值并将相同的值作为行

1 个答案: