SQL SERVER 消息 156,级别 15,状态 1,第 2 行 关键字 'SCHEMA' 附近有语法错误.

SET SCHEMA S-T;
CREATE TABLE stu(
rno CHAr(10),
rname CHAr(100),
rage INT,
rspecialty CHAr(100)
);
CREATE TABLE c(
ctime CHAr(100),
cplace CHAr(100)
);
CREATE TABLE sel(
grade INT check(grade between 0 and 100)
);
ALTER TABLE sel ADD rcoursename CHAr(100);
ALTER TABLE stu ALTER COLUMN rname CHAr(50);
ALTER TABLE c ADD CONSTRAINT ctime CHECK (ctime between 19 and 20);

不知道哪里错了 求为大神帮忙看一下

ALTER USER 数据库 WITH DEFAULT_SCHEMA = S-T;

use adventureworks2012; go create schema sprockets authorization annik create table nineprongs (source int, cost int, partnumber int) grant select on schema::sprockets to mandar deny select on schema::sprockets to prasanna; go

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