有多种方法:select regexp_substr('ED2WCSID_PH_20110324.txt','[0-9]+',5) from dual;结果:select regexp_substr('EDWCSID_PH_20110324.txt','[0-9]+') from dual;结果:
用 Mid(x,m[,n]) 函数, mid ("CYJ8-ABC",4,1) mid ("LGB16-ABCD",4,2) mid ("LGB32-ABCD",4,2) mid ("LGB4-ABCD",4,1) 就知道这么些!