oracle創(chuàng)建數(shù)據(jù)庫(kù)的sql語(yǔ)句 Oracle中查詢IP地址的SQL語(yǔ)句?
Oracle中查詢IP地址的SQL語(yǔ)句?select startip,endip,location from T _ Base _ IP address info where cint(replace
Oracle中查詢IP地址的SQL語(yǔ)句?
select startip,endip,location from T _ Base _ IP address info where cint(replace(IP,.,))cint(replace(startip,。,))和cint(replac
oracle數(shù)據(jù)庫(kù)求差值的sql語(yǔ)句?
用t1a(select shuzi,riqi,rownum as rn from (select shuzi,riqi from aoder by 2)t)select(0)as n
Oracle中用SQL語(yǔ)句如何實(shí)現(xiàn)進(jìn)制間互相轉(zhuǎn)換?
首先,字符串必須是數(shù)字字符串,例如 "12345 "or "-12345 "。然后需要使用to_number函數(shù)進(jìn)行轉(zhuǎn)換。比如:
1從dual中選擇to _ number(12345);這樣字符轉(zhuǎn)換成數(shù)字,可以參與加減乘除。
您已經(jīng)估計(jì)了這個(gè)自定義函數(shù),所以您可以 t直接使用to_number創(chuàng)建函數(shù)12345678910創(chuàng)建或替換函數(shù)is number(varchar 2中的p)返回numb:到_號(hào)碼(p)
;返回測(cè)試;exceptionwhen VALUE_ERROR然后返回0;結(jié)束;測(cè)試1,純數(shù)字測(cè)試2,非數(shù)字字符測(cè)試3,負(fù)數(shù)測(cè)試4,小數(shù)測(cè)試5 0。簡(jiǎn)而言之,測(cè)試5和測(cè)試2的結(jié)果是一樣的。你打算如何解決這個(gè)問(wèn)題?擴(kuò)展數(shù)據(jù)有小數(shù)點(diǎn)嗎?如果有小數(shù)點(diǎn),從dual中選擇trunc (to _ number (1234,56897),2)。如果都是整數(shù),那么就從dual中選擇to _ number (1234,56897),2)。