Question

希望有人可以帮我处理mysql查询

这就是我所拥有的：

我使用包含以下数据的“networkname”列表：

“VLAN-338-Network1-A,VLAN-364-Network2-A,VLAN-988-Network3-A,VLAN-1051-Network4-A”

我需要一个MySQL查询，它将更新该列，只有vlan编号按升序排列，删除其他所有内容。即。

“338, 364, 988, 1051”

谢谢，大卫

Answer 1

在此脚本中，我创建了一个循环networkname值的过程，并将数字解析为单独的表，然后使用group_concat函数更新YourTable。这假设您的网络名称值遵循＆＃39; VLAN-XXX＆＃39;你的例子中的模式＆＃39; XXX＆＃39;是要提取的3-4位数字。这也假设每条记录都有一个唯一的ID。

CREATE PROCEDURE networkname_parser()
BEGIN
-- load test data
drop table if exists YourTable;
create table YourTable
  (
    ID int not null auto_increment,
    networkname nvarchar(100),
    primary key (ID)
  );
insert into YourTable(networkname) values
  ('VLAN-338-Network1-A,VLAN-364-Network2-A,VLAN-988-Network3-A,VLAN-1051-Network4-A'),
  ('VLAN-231-Network1-A,VLAN-4567-Network2-A'),
  ('VLAN-9876-Network1-A,VLAN-321-Network2-A,VLAN-1678-Network3-A');

-- add commas to the end of networkname for parsing
update YourTable set networkname = concat(networkname,',');

-- parse networkname into related table
drop table if exists ParseYourString;
create table ParseYourString(ID int,NetworkNumbers int);
while (select count(*) from YourTable where networkname like 'VLAN-%') > 0
  do
    insert into ParseYourString
    select ID,replace(substr(networkname,6,4),'-','')
    from YourTable
    where networkname like 'VLAN-%';
    update YourTable
    set networkname = right(networkname,char_length(networkname)-instr(networkname,','))
    where networkname like 'VLAN-%';
  end while;

-- update YourTable.networkname with NetworkNumbers
update YourTable t
    inner join (select ID,group_concat(networknumbers order by networknumbers asc) as networknumbers
                from ParseYourString
                group by ID) n
      on n.ID = t.ID
  set t.networkname = n.networknumbers;
END//

调用程序并选择结果：

call networkname_parser();
select * from YourTable;

SQL小提琴：http://www.sqlfiddle.com/#!2/01c77/1

更新具有从当前列数据解析的多个值的列

1 个答案: