oracle怎么截取指定字符后面的字符串，或者刪除指定字符前面的字符串也行？取最后一個(gè)后面的字符select substr("D:AssetsManagementresourceehcachetest

oracle怎么截取指定字符后面的字符串，或者刪除指定字符前面的字符串也行？

取最后一個(gè)后面的字符select substr("D:AssetsManagementresourceehcachetest.txt"，1 (select instr ("D:AssetsManagementresourceehcachetest.txt"，""，1，(select length("D:AssetsManagementresourceehcachetest.txt") - length(replace("D:AssetsManagementresourceehcachetest.txt"，""，"")) from dual)) from dual)，length("D:AssetsManagementresourceehcachetest.txt")-(select instr ("D:AssetsManagementresourceehcachetest.txt"，""，1，(select length("D:AssetsManagementresourceehcachetest.txt") - length(replace("D:AssetsManagementresourceehcachetest.txt"，""，"")) from dual)) from dual)) from dual如果前面D:AssetsManagementresourceehcache是固定的就直接replace了select replace("D:AssetsManagementresourceehcachetest.txt"，"D:AssetsManagementresourceehcache"，"") from dual

oracle如何截取指定字符串？

oracle中，截取某個(gè)字符串前的字符需要用instr函數(shù)和substr函數(shù)共同完成。工具：oracle 10g步驟：1、以截取字符串“210-1106000001”中“-”前的部分為例。2、執(zhí)行語(yǔ)句為：select substr("210-1106000001"，1，instr("210-1106000001"，"-")-1) from dual3、結(jié)果為：instr函數(shù)語(yǔ)法：instr( string1， string2， start_position，nth_appearance )參數(shù)含義：substr函數(shù)語(yǔ)法：substr(strings|express，m，[n])參數(shù)含義：strings|express ：被截取的字符串或字符串表達(dá)式。m 從第m個(gè)字符開(kāi)始截取。n 截取后字符串長(zhǎng)度為n。