项目需求：对特定类别的列进行一些操作，以下代码可以检查
数据库内同一类别的所有列。
查询所有nvarchar的列。
复制代码 代码示例:
SELECT a.name, o.name AS TableName, o.type, a.id, o.object_id, o.schema_id
FROM sys.syscolumns AS a INNER JOIN sys.systypes AS b ON a.xtype = b.xtype
AND b.name = 'nvarchar'
INNER JOIN
sys.objects AS o ON a.id = o.object_id
WHERE (o.type = 'u')
AND (o.schema_id = 1)
