oracle創(chuàng)建數(shù)據(jù)庫的sql語句 Oracle中查詢IP地址的SQL語句?
Oracle中查詢IP地址的SQL語句?select startip,endip,location from T _ Base _ IP address info where cint(replace
Oracle中查詢IP地址的SQL語句?
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)庫求差值的sql語句?
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語句如何實現(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)估計了這個自定義函數(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_號碼(p)
;返回測試;exceptionwhen VALUE_ERROR然后返回0;結(jié)束;測試1,純數(shù)字測試2,非數(shù)字字符測試3,負(fù)數(shù)測試4,小數(shù)測試5 0。簡而言之,測試5和測試2的結(jié)果是一樣的。你打算如何解決這個問題?擴(kuò)展數(shù)據(jù)有小數(shù)點嗎?如果有小數(shù)點,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)。