用SQL Server 2000 的查询分析器创建时，下面代码有错误，但找不出来，请指教

drop table B
CREATE TABLE B
(
bno int CONSTRAINT B_Prim PRIMARY KEY,
bn varchar(20),
num int

)
CREATE TABLE S
(
sno int CONSTRAINT S_Prim PRIMARY KEY,
sn varchar(20),
sex char(2),
age int,
dept char(10),
bno int
)
CREATE TABLE C(
cno int,
cn varchar(20),
xnxq char,
ct double,
num int,
CONSTRAINT C_Prim PRIMARY KEY(cno,xnxq)
)
create table SC
(
xnxq datetime,
sno int,
cno int,
score double(100),
CONSTRAINT SC_Prim PRIMARY KEY(xnxq,sno,cno)
)

CREATE TABLE C(
cno int,
cn varchar(20),
xnxq char,
ct decimal ,
num int,
CONSTRAINT C_Prim PRIMARY KEY (cno,xnxq)
)

create table SC
(
xnxq datetime,
sno int,
cno int,
score DECIMAL(100),
CONSTRAINT SC_Prim PRIMARY KEY(xnxq,sno,cno)
)

sqlserver没double字段类型