根据列值重复行答案

【问题标题】：Repeat rows based on column value根据列值重复行
【发布时间】：2018-04-02 10:55:17
【问题描述】：

我有一张像下面这样的桌子。 “Repeater”列包含字符串和整数值，基于此我希望能够复制和重复行。如果“Repeater”值是字符串，始终以逗号分隔，则行应根据存在的值数量重复，并且每行应具有其中一个值。如果“Repeater”值是一个整数，那么它应该根据该值复制该行。

+---------+--------+-----------------+
| OrderNo | Amount |    RepeaterRes  |
+---------+--------+-----------------+
| AB-001  |    100 | Orange, Apple,  |
| AB-002  |    102 | 3               |
| AB-003  |    980 | Apple           |
| AB-004  |    309 | Banana, Grapes, |
| AB-005  |    840 | 2               |
| AB-006  |    290 | 0               |
| AB-007  |    483 | 0               |
+---------+--------+-----------------+

所需的输出：

+---------+--------+----------+
| OrderNo | Amount | Repeater |
+---------+--------+----------+
| AB-001  |    100 | Orange,  |
| AB-001  |    100 | Apple,   |
| AB-002  |    102 | 3        |
| AB-002  |    102 | 3        |
| AB-002  |    102 | 3        |
| AB-003  |    980 | Apple    |
| AB-004  |    309 | Banana,  |
| AB-004  |    309 | Grapes,  |
| AB-005  |    840 | 2        |
| AB-005  |    840 | 2        |
| AB-006  |    290 | 0        |
| AB-007  |    483 | 0        |
+---------+--------+----------+

【问题讨论】：

标签： sql-server duplicates

【解决方案1】：

假设不是 2016+

示例

Select OrderNo
      ,Amount
      ,C.*
 from  YourTable A
 Cross Apply ( values (case when try_convert(int,[RepeaterRes]) is null then [RepeaterRes] else replicate([RepeaterRes]+',',IsNull(NullIf(try_convert(int,[RepeaterRes]),0),1)) end )) B(NewString)
 Cross Apply (
                Select Repeater  = LTrim(RTrim(B.i.value('(./text())[1]', 'varchar(max)')))
                 From  (Select x = Cast('<x>' + replace((Select replace(NewString,',','§§Split§§') as [*] For XML Path('')),'§§Split§§','</x><x>')+'</x>' as xml).query('.')) as A 
                 Cross Apply x.nodes('x') AS B(i)
             ) C
 Where C.Repeater is not null

退货

OrderNo Amount  Repeater
AB-001  100     Orange
AB-001  100     Apple
AB-002  102     3
AB-002  102     3
AB-002  102     3
AB-003  980     Apple
AB-004  309     Banana
AB-004  309     Grapes
AB-005  840     2
AB-005  840     2
AB-006  290     0
AB-007  483     0

【讨论】：