substr

标签：XA   abc   spec   The   dual   --   bst   pre   win   

Examples

The following example returns several specified substrings of "ABCDEFG":

SELECT SUBSTR(‘ABCDEFG‘,3,4) "Substring"
     FROM DUAL;
 
Substring
---------
CDEF

SELECT SUBSTR(‘ABCDEFG‘,-5,4) "Substring"
     FROM DUAL;

Substring
---------
CDEF

substr

标签：XA   abc   spec   The   dual   --   bst   pre   win   

原文地址：https://www.cnblogs.com/kakaisgood/p/9071424.html