准备测试数据：create table teacher (id varchar2(10),name varchar2(20),remark varchar2(50));create table course (id varch
xmltransform（xmltype_instance,xsl_ss)：该函数用于将xmltype实例按照xsl样式进行转换，并生成新的xmltype实例。示例如下：
sql> select xmltransform(w.warehouse-spec,x.coll).getclobval()
2 from warehouse w,xsl_tab x
3 where w.warehouse_name='san francisco';
create table purchase_order( po_no number(9),po_file xmltype)
insert into purchase_order values(68,xmltype('
'))
select extract(po_file,'out/record/filename').getstringval() as filename,extract(po_file,'out/record/fileid').getstringval() as fileid from purchase_order
select extract(po_file,'out/record/@id').getstringval() as record from purchase_order
select extract(po_file,'out/record/filename').getstringval() as filename from purchase_order
select extractvalue(value(i),'/filename') as filename
from purchase_order x,
table(xmlsequence(extract(x.po_file,'out/record/filename'))) i
每个人都需要一台速度更快、更稳定的 PC。随着时间的推移，垃圾文件、旧注册表数据和不必要的后台进程会占用资源并降低性能。幸运的是，许多工具可以让 Windows 保持平稳运行。
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