ORACLE sql 使用列别名 如果希望在别名中使用空格,并要保留空格,就必须使用双引号将别名正文引起来。在别名之前,也可以使用可选的关键字ASselect price as price from emp:select price as "price" from emp:select price "price on emp " from emp;select price as "price on emp" frmo emp;