SQL server 多行一列，把这些结果拼接成一个字符串

查询结果为多行一列，现在要把这些结果拼接成一个字符串！

select [values]=stuff((select ‘,’+coal_id from statement t for xml path(”)), 1, 1, ”)

1.for xml path

将查询结果变成xml

a. select well_id,coal_id from cbm_well_coalbed_info t for xml path(‘liuxm’)

产生的结果如下：

<liuxm>

<well_id>8ad882351ede89c6011eecb09b290002</well_id>

<coal_id>8ad882351ec8d47c011ec99e01b6002b</coal_id>

</liuixm>

2. stuff函数

删除指定长度的字符串并在指定的起始点插入另一组字符
STUFF ( character_expression , start , length , character_expression )
character_expression ：操作的字符，
start:删除和插入的起始点，
length:删除的长度，
character_expression ：要插入的字符

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