如何从 SQL 表中提取 ID 列表作为逗号分隔值字符串? [英] How can I pull a list of ID's from a SQL table as a comma-separated values string?

问题描述

我必须仅使用符合某些条件的记录从表中提取整数 ID 列表.例如:

I have to pull a list of integer IDs from a table using only records that match some criteria. For example:

Select ProdID From Products Where (ProdType='XYZ');

问题是我必须将它作为一组逗号分隔值返回，以便我可以使用它来选择多选列表中的项目:

The catch is that I have to return it as a set of comma separated values so I can use it to select items in a multi-select list:

111,231,554,112

而不是记录.我不想在我的 C# 代码中这样做 - 我希望它通过这种方式直接从数据库中出来.有什么想法吗?

rather than as records. I do not want to do this in my C# code - I'd like it to come right out of the database via a query this way. Any ideas?

推荐答案

除了@OMG Ponies 方法，您还可以尝试以下 COALESCE 技巧:

In addition to @OMG Ponies method, you could also try this COALESCE trick from:

使用 COALESCE 构建逗号分隔的字符串

declare @string nvarchar(255)

select @string = coalesce(@string + ', ', '') + cast(prodid as nvarchar(5))
from products

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