将 2 个转换后的文本字段连接在一起答案

【问题标题】：Joining together 2 converted text fields将 2 个转换后的文本字段连接在一起
【发布时间】：2017-05-06 12:35:55
【问题描述】：

努力加入两个文本字段

,RTRIM(LTRIM(REPLACE(IM.ITEMDESC,',',''))) AS ITEMDESCR
,RTRIM(LTRIM(ISNULL(REPLACE(REPLACE(convert(varchar(MAX),[TXTFIELD]), 
CHAR(13),' '),',',''),''))) AS EXTRADESCRIPTION

必须删除第二行的回车 - 尝试过 Concat 和 + 但都不起作用。第二行也有空值，因此如果空值只想显示第一行。

【问题讨论】：

SQL Server 还是 mysql？
SQL 服务器。谢谢

标签： sql join text concat sql-convert

【解决方案1】：

create table im (id int not null identity(1,1), itemdesc varchar(64), txtfield text)
insert into im values 
 ('Pencil','Writing utensil')
,('Pen',null)
,(null,'Writing utensil')

select
    rtrim(ltrim(replace(im.itemdesc,',',''))) as itemdescr 
  , rtrim(ltrim(isnull(replace(replace(convert(varchar(max),txtfield), char(13),' '),',',''),''))) as extradescription
  , isnull(rtrim(ltrim(replace(im.itemdesc,',','')))+' ','')
  + isnull(rtrim(ltrim(replace(replace(convert(varchar(max),txtfield), char(13),' '),',',''))),'')
    as combined_description
from im

rextester 演示：http://rextester.com/YQDARN44856

+-----------+------------------+------------------------+
| itemdescr | extradescription |  combined_description  |
+-----------+------------------+------------------------+
| Pencil    | Writing utensil  | Pencil Writing utensil |
| Pen       |                  | Pen                    |
| NULL      | Writing utensil  | Writing utensil        |
+-----------+------------------+------------------------+

【讨论】：

谢谢，isnull(rtrim(ltrim(replace(im.itemdesc,',','')))+' ','') + isnull(rtrim(ltrim(replace(replace( convert(varchar(max),txtfield), char(13),' '),',',''))),'') as combined_description 效果很好:)
@Jamiehampson 乐于助人！