Partition table的switch条件1：结构相同（类型，nullability）

1，创建实例数据

-- create parition function
CREATE PARTITION FUNCTION pf_int_Left (int)
AS
RANGE LEFT
FOR VALUES (10,20);

--create partition scheme
CREATE PARTITION SCHEME PS_int_Left
AS
PARTITION pf_int_Left
TO ([primary], [primary], [primary]);

--create partitioned table
create table dbo.dt_partition
(
ID int,
Code int
)
on PS_int_Left (ID)

--insert data into dbo.dt_partition
insert into dbo.dt_partition
(
ID,
Code
)
values(15,2)

创建 staging table，用于接收partition 2的数据

2，测试 nullability

--Create staging table
create table dbo.dt_SwitchStaging
(
ID int not null,
Code int
)
on [primary]

switch data

--swith partition 2 to staging table
alter table dbo.dt_partition
switch partition 2
to dbo.dt_SwitchStaging

Msg 4985, Level 16, State 1, Line 2
ALTER TABLE SWITCH statement failed because column ‘ID‘ does not have the same nullability attribute in tables ‘DB_Study.dbo.dt_partition‘ and ‘DB_Study.dbo.dt_SwitchStaging‘.

3，测试数据类型的兼容性

alter table  dbo.dt_SwitchStaging
alter column ID bigint null

switch data

--swith partition 2 to staging table
alter table dbo.dt_partition
switch partition 2
to dbo.dt_SwitchStaging

Msg 4944, Level 16, State 1, Line 2
ALTER TABLE SWITCH statement failed because column ‘ID‘ has data type int in source table ‘DB_Study.dbo.dt_partition‘ which is different from its type bigint in target table ‘DB_Study.dbo.dt_SwitchStaging‘.