Oracle oracle common statement recorded in the substr () function and application Detailed

A, oracle database of 99 common query

https://www.jb51.net/article/40470.htm

1、

Check out all the information employees hired in 1981 (1981 hired between January 1 to December 31, 1981 employees)
the SELECT * from emp the WHERE the HireDate the BETWEEN '1- 1 Yue -81' and '31 - December -81 ';

Extended:

When recording certain period of time Oracle query, sql wording between and

 https://blog.csdn.net/qq_34120041/article/details/54600802

 2、substr

Extended: the Oracle of substr () function and application Detailed

 https://www.cnblogs.com/dshore123/p/7805050.html

 3、trunc

https://jingyan.baidu.com/article/4dc408487c5910c8d846f14b.html

 

 https://www.cnblogs.com/iliuyuet/p/4585666.html