连接基于 SQL 字符串

Question

我目前有这些数据：

appointment_num  order_num modified_proc_desc
"124"             "1"   "DIVISION OF PENILE SKIN BRIDGE"
"125"             "1"   "CIRCUMCISION"
"126"             "1"   "BILATERAL INGUINAL EXPLORATION"
"126"             "2"   "BILATERAL INGUINAL HERNIA/HYDROCELE REPAIR"
"126"             "3"   "POSSIBLE RIGHT ORCHIOPEXY"
"127"             "1"   "EXCISION SCALP CYST"
"128"             "1"   "REPAIR INCOMPLETE CIRCUMCISION"
"129"             "1"   "CIRCUMCISION"

由此表/查询产生：

SELECT [appointment_num]
      ,[order_num]
      ,[modified_proc_desc]
FROM [adv].[dbo].[as_appointment_procs]

我可以根据与 XML PATH ('') 相同的 order_num 将 modified_proc_desc 字段连接在一起。我需要能够按顺序加入他们。例如，对于上面的约会编号“126”，我希望将 order_num 1、2 和 3 的 modified_proc_desc 字符串连接到一个新的 case_procedure 字段上。换句话说，我只想显示一个包含所有订单的约会。

任何人都可以在这里指出正确的方向吗？这是一个示例输出：

appointment_num  order_num case_procedure
"124"             "1"   "DIVISION OF PENILE SKIN BRIDGE"
"125"             "1"   "CIRCUMCISION"
"126"             "1"   "BILATERAL INGUINAL EXPLORATION, BILATERAL INGUINAL HERNIA/HYDROCELE REPAIR, POSSIBLE RIGHT ORCHIOPEXY"
"127"             "1"   "EXCISION SCALP CYST"
"128"             "1"   "REPAIR INCOMPLETE CIRCUMCISION"
"129"             "1"   "CIRCUMCISION"

Answer 1

一种方法是创建一个内联子查询以将值组合到一行中：

SELECT DISTINCT 
    appointment_num,
    STUFF(
        (SELECT ', ' + p2.modified_proc_desc
        FROM as_appointment_procs p2
        WHERE p2.appointment_num = p.appointment_num
        ORDER BY p2.order_num
        FOR XML PATH(''), type).value('(./text())[1]','varchar(max)') 
        ,1,2,'') AS case_procedure
FROM as_appointment_procs p

STUFF 命令删除前导逗号。