我在编写的代码生成器中使用它来获取主键：
SELECt i.name AS IndexName, OBJECT_NAME(ic.OBJECT_ID) AS TableName, COL_NAME(ic.OBJECT_ID,ic.column_id) AS ColumnName, c.is_identity, c.user_type_id, CAST(c.max_length AS int) AS max_length, CAST(c.precision AS int) AS precision, CAST(c.scale AS int) AS scale FROM sys.indexes AS i INNER JOIN sys.index_columns AS ic INNER JOIN sys.columns AS c ON ic.object_id = c.object_id AND ic.column_id = c.column_id ON i.OBJECT_ID = ic.OBJECT_ID AND i.index_id = ic.index_id WHERe i.is_primary_key = 1 AND ic.OBJECT_ID = OBJECT_ID('dbo.YourTableNameHere')ORDER BY OBJECT_NAME(ic.OBJECT_ID), ic.key_ordinal
