Oracle sql MATERIALIZE 查詢結果吃不到 index 的暴力解決方案
select /*+ MATERIALIZE */ 1 as t, 2 as y from dual
https://blog.csdn.net/liangweiwei130/article/details/37882503
https://community.oracle.com/tech/developers/discussion/2325296/what-are-lacks-of-using-materialize-hint