SQLSERVER中新增Index，必须将原有ClusteredIndex删除，修改成nonclustered index

执行示例如下

---1. Drop the cluster index
ALTER TABLE S_SYORIRIREKI DROP CONSTRAINT PK_S_SYORIRIREKI
go
---2. Create a new unclustered index --SYORITSUBAN
ALTER TABLE S_SYORIRIREKI ADD CONSTRAINT PK_S_SYORIRIREKI
PRIMARY KEY NONCLUSTERED (SYORITSUBAN)

---3. Create a new unclustered index (with desc) --SYORISYMDHMS
create nonclustered index INDEX_SYORISYMDHMS on S_SYORIRIREKI (SYORISYMDHMS desc) --45s
go

---4. Create a new unclustered index
create nonclustered index INDEX_KINOKANRIIDUSERID on S_SYORIRIREKI (KINOKANRIID,USERID) --45s
go

GO
DECLARE @THETABLE varchar(100);
SET @THETABLE = 'dbo.S_SYORIRIREKI';
select i.*
from sys.indexes i
where i.object_id = OBJECT_ID('S_SYORIRIREKI')
and i.name is not NULL;