该查询在与原始代码正文不同的上下文中运行，因此它不知道任何局部变量。尝试改用全局临时表。
CREATE TABLE ##t (
id INT IDENTITY(1,1),
some fields
)
DECLARE @query VARCHAR(MAX)
SET @query = 'SELECT
some values
FROM ##t t
INNER JOIN dbo.Table d ON t.field = d.field'
EXEC msdb.dbo.sp_send_dbmail @recipients=@recipients_list,
@subject = @subject,
@query = @query,
@attach_query_result_as_file = 1,
@query_result_width = 4000,
@query_attachment_filename = 'Details.txt'
DROP TABLE ##t
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