什么是T-SQL要授予SQL Server中数据库中表的读写权限？

-- 授予用户对表的读权限
GRANT SELECT ON schema_name.table_name TO user_name;

-- 授予用户对表的写权限
GRANT INSERT ON schema_name.table_name TO user_name;
GRANT UPDATE ON schema_name.table_name TO user_name;
GRANT DELETE ON schema_name.table_name TO user_name;

-- 授予用户对所有表的读写权限
GRANT SELECT, INSERT, UPDATE, DELETE ON schema_name.* TO user_name;