Oracle sql 실행 효율 향상 에 대한 소감 제안

 
-->FROM ,

--> WHERE

-->ORACLE '*'

-->DELETE rollback segment , TRUNCATE

-->COMMIT :1.rollback segment
2.
3.redo log buffer

--> Alias Column

-->ORACLE sql

--> NOT

-->

--> '>=', '>'

-->where '!='、'||'、'+'

-->IN ,IN

-->EXIST

--> ,UNION OR

-->IS NULL

-->DISTINCT,UNION,MINUS,INTERSECT,ORDER BY SORT ,

-->

--> UNION ALL UNION

--> TO_NUMBER() 。

--> :col = '123' col = 123, TO_NUMBER(EMP_TYPE)=123

--> :HAVING WHERE HAVING

--> ,INSERT,DELETE,UPDATE I/O

--> :ALTER INDEX <INDEXNAME> REBUILD <TABLESPACENAME> [ONLINE]

좋은 웹페이지 즐겨찾기