在 MSSQL 中,我在分区表上有索引,对此我不理解属性 key_ordinal
为零时的含义。
要创建索引,分区方案基于 CUT_OFF。
create table dbo.TESTTB (CUT_OFF datetime, number int) on partscheme(CUT_OFF);
create index TESTIX on dbo.TESTTB (number) on partscheme(CUT_OFF);
查询显示key_ordinal的值:
select c.name as column_name, b.key_ordinal
from sys.indexes a
inner join sys.index_columns b
on a.object_id = b.object_id and a.index_id = b.index_id
inner join sys.all_columns c on b.object_id = c.object_id
and b.column_id = c.column_id
where a.name = 'TESTIX'
结果是:
column_name key_ordinal
CUT_OFF 0
number 1
列CUT_OFF:
- 显示在
sys.index_columns
中,key_ordinal = 0 Create Index
语句中缺少sp_help 'TESTTB'
中的索引信息缺失
0 = Not a key column, or is an XML index, a columnstore index, or a spatial index.
这是什么意思? 什么是 key_ordinal = 0?
谢谢
最佳答案
关于sql - 什么是索引列的 key_ordinal = 0,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37882445/