當前位置：首頁 > 运维知识 > 数据库 >内容正文

数据库

oracle SQL以结尾函数,Oracle SQL 内置函数大全

發布時間：2024/1/8 数据库 33 豆豆

生活随笔收集整理的這篇文章主要介紹了 oracle SQL以结尾函数,Oracle SQL 内置函数大全小編覺得挺不錯的,現在分享給大家,幫大家做個參考.

https://www.cnblogs.com/lfx0692/articles/2395950.html

SQL中的單記錄函數

1.ASCII?返回與指定的字符對應的十進制數;

SQL> select ascii('A') A,ascii('a') a,ascii('0') zero,ascii(' ') space from dual;

A???????? A????? ZERO???? SPACE

--------- --------- --------- ---------

65??????? 97??????? 48??????? 32

2.CHR?給出整數,返回對應的字符;

SQL> select chr(54740) zhao,chr(65) chr65 from dual;

ZH C

-- -

趙 A

3.CONCAT?連接兩個字符串;

SQL> select concat('010-','88888888')||'轉23' 高乾競電話 from dual;

高乾競電話

----------------

010-88888888轉23

4.INITCAP?返回字符串并將字符串的第一個字母變為大寫;

SQL> select initcap('smith') upp from dual;

UPP

-----

Smith

5.INSTR(C1,C2,I,J)?在一個字符串中搜索指定的字符,返回發現指定的字符的位置;

C1??? 被搜索的字符串

C2??? 希望搜索的字符串

I???? 搜索的開始位置,默認為1

J???? 出現的位置,默認為1

SQL> select instr('oracle traning','ra',1,2) instring from dual;

INSTRING

---------

6.LENGTH?返回字符串的長度;

SQL> select name,length(name),addr,length(addr),sal,length(to_char(sal)) from .nchar_tst;

NAME?? LENGTH(NAME) ADDR???????????? LENGTH(ADDR)?????? SAL LENGTH(TO_CHAR(SAL))

------ ------------ ---------------- ------------ --------- --------------------

高乾競??????????? 3 北京市海錠區??????????????? 6?? 9999.99??????????????????? 7

7.LOWER?返回字符串,并將所有的字符小寫

SQL> select lower('AaBbCcDd')AaBbCcDd from dual;

AABBCCDD

--------

aabbccdd

8.UPPER?返回字符串,并將所有的字符大寫

SQL> select upper('AaBbCcDd') upper from dual;

UPPER

--------

AABBCCDD

9.RPAD和LPAD(粘貼字符)

RPAD 在列的右邊粘貼字符

LPAD 在列的左邊粘貼字符

SQL> select lpad(rpad('gao',10,'*'),17,'*')from dual;

LPAD(RPAD('GAO',1

-----------------

*******gao*******

不夠字符則用*來填滿

10.LTRIM和RTRIM

LTRIM 刪除左邊出現的字符串

RTRIM 刪除右邊出現的字符串

SQL> select ltrim(rtrim('?? gao qian jing?? ',' '),' ') from dual;

LTRIM(RTRIM('

-------------

gao qian jing

11.SUBSTR(string,start,count)

取子字符串,從start開始,取count個

SQL> select substr('13088888888',3,8) from dual;

SUBSTR('

--------

08888888

12.REPLACE('string','s1','s2')

string?? 希望被替換的字符或變量

s1?????? 被替換的字符串

s2?????? 要替換的字符串

SQL> select replace('he love you','he','i') from dual;

REPLACE('HELOVEYOU','HE','I')

------------------------------

i love you

13.SOUNDEX?返回一個與給定的字符串讀音相同的字符串

SQL> create table table1(xm varchar(8));

SQL> insert into table1 values('weather');

SQL> insert into table1 values('wether');

SQL> insert into table1 values('gao');

SQL> select xm from table1 where soundex(xm)=soundex('weather');

--------

weather

wether

14.TRIM('s' from 'string')

LEADING?? 剪掉前面的字符

TRAILING 剪掉后面的字符

如果不指定,默認為空格符

15.ABS?返回指定值的絕對值

SQL> select abs(100),abs(-100) from dual;

ABS(100) ABS(-100)

--------- ---------

100?????? 100

16.ACOS?給出反余弦的值

SQL> select acos(-1) from dual;

ACOS(-1)

---------

3.1415927

17.ASIN?給出反正弦的值

SQL> select asin(0.5) from dual;

ASIN(0.5)

---------

.52359878

18.ATAN?返回一個數字的反正切值

SQL> select atan(1) from dual;

ATAN(1)

---------

.78539816

19.CEIL?返回大于或等于給出數字的最小整數

SQL> select ceil(3.1415927) from dual;

CEIL(3.1415927)

---------------

20.COS?返回一個給定數字的余弦

SQL> select cos(-3.1415927) from dual;

COS(-3.1415927)

---------------

-1

21.COSH?返回一個數字反余弦值

SQL> select cosh(20) from dual;

COSH(20)

---------

242582598

22.EXP?返回一個數字e的n次方根

SQL> select exp(2),exp(1) from dual;

EXP(2)??? EXP(1)

--------- ---------

7.3890561 2.7182818

23.FLOOR?對給定的數字取整數

SQL> select floor(2345.67) from dual;

FLOOR(2345.67)

--------------

2345

24.LN?返回一個數字的對數值

SQL> select ln(1),ln(2),ln(2.7182818) from dual;

LN(1)???? LN(2) LN(2.7182818)

--------- --------- -------------

0 .69314718???? .99999999

25.LOG(n1,n2)?返回一個以n1為底n2的對數

SQL> select log(2,1),log(2,4) from dual;

LOG(2,1) LOG(2,4)

--------- ---------

26.MOD(n1,n2)?返回一個n1除以n2的余數

SQL> select mod(10,3),mod(3,3),mod(2,3) from dual;

MOD(10,3) MOD(3,3) MOD(2,3)

--------- --------- ---------

1???????? 0???????? 2

27.POWER?返回n1的n2次方根

SQL> select power(2,10),power(3,3) from dual;

POWER(2,10) POWER(3,3)

----------- ----------

1024???????? 27

28.ROUND和TRUNC

按照指定的精度進行舍入

SQL> select round(55.5),round(-55.4),trunc(55.5),trunc(-55.5) from dual;

ROUND(55.5) ROUND(-55.4) TRUNC(55.5) TRUNC(-55.5)

----------- ------------ ----------- ------------

56????????? -55????????? 55????????? -55

29.SIGN?取數字n的符號,大于0返回1,小于0返回-1,等于0返回0

SQL> select sign(123),sign(-100),sign(0) from dual;

SIGN(123) SIGN(-100)?? SIGN(0)

--------- ---------- ---------

1???????? -1???????? 0

30.SIN?返回一個數字的正弦值

SQL> select sin(1.57079) from dual;

SIN(1.57079)

------------

31.SIGH?返回雙曲正弦的值

SQL> select sin(20),sinh(20) from dual;

SIN(20) SINH(20)

--------- ---------

.91294525 242582598

32.SQRT?返回數字n的根

SQL> select sqrt(64),sqrt(10) from dual;

SQRT(64) SQRT(10)

--------- ---------

8 3.1622777

33.TAN?返回數字的正切值

SQL> select tan(20),tan(10) from dual;

TAN(20)?? TAN(10)

--------- ---------

2.2371609 .64836083

34.TANH

返回數字n的雙曲正切值

SQL> select tanh(20),tan(20) from dual;

TANH(20)?? TAN(20)

--------- ---------

1 2.2371609

35.TRUNC

按照指定的精度截取一個數

SQL> select trunc(124.1666,-2) trunc1,trunc(124.16666,2) from dual;

TRUNC1 TRUNC(124.16666,2)

--------- ------------------

100???????????? 124.16

36.ADD_MONTHS

增加或減去月份

SQL> select to_char(add_months(to_date('199912','yyyymm'),2),'yyyymm') from dual;

TO_CHA

------

200002

SQL> select to_char(add_months(to_date('199912','yyyymm'),-2),'yyyymm') from dual;

TO_CHA

------

199910

37.LAST_DAY

返回日期的最后一天

SQL> select to_char(sysdate,'yyyy.mm.dd'),to_char((sysdate)+1,'yyyy.mm.dd') from dual;

TO_CHAR(SY TO_CHAR((S

---------- ----------

2004.05.09 2004.05.10

SQL> select last_day(sysdate) from dual;

LAST_DAY(S

----------

31-5月 -04

38.MONTHS_BETWEEN(date2,date1)

給出date2-date1的月份

SQL> select months_between('19-12月-1999','19-3月-1999') mon_between from dual;

MON_BETWEEN

-----------

SQL>selectmonths_between(to_date('2000.05.20','yyyy.mm.dd'),to_date('2005.05.20','yyyy.dd')) mon_betw from dual;

MON_BETW

---------

-60

39.NEW_TIME(date,'this','that')

給出在this時區=other時區的日期和時間

SQL> select to_char(sysdate,'yyyy.mm.dd hh24:mi:ss') bj_time,to_char(new_time

2 (sysdate,'PDT','GMT'),'yyyy.mm.dd hh24:mi:ss') los_angles from dual;

BJ_TIME???????????? LOS_ANGLES

------------------- -------------------

2004.05.09 11:05:32 2004.05.09 18:05:32

40.NEXT_DAY(date,'day')

給出日期date和星期x之后計算下一個星期的日期

SQL> select next_day('18-5月-2001','星期五') next_day from dual;

NEXT_DAY

----------

25-5月 -01

41.SYSDATE?用來得到系統的當前日期

SQL> select to_char(sysdate,'dd-mm-yyyy day') from dual;

TO_CHAR(SYSDATE,'

-----------------

09-05-2004 星期日

trunc(date,fmt)按照給出的要求將日期截斷,如果fmt='mi'表示保留分,截斷秒

SQL> select to_char(trunc(sysdate,'hh'),'yyyy.mm.dd hh24:mi:ss') hh,

2 to_char(trunc(sysdate,'mi'),'yyyy.mm.dd hh24:mi:ss') hhmm from dual;

HH????????????????? HHMM

------------------- -------------------

2004.05.09 11:00:00 2004.05.09 11:17:00

42.CHARTOROWID?將字符數據類型轉換為ROWID類型

SQL> select rowid,rowidtochar(rowid),ename from scott.emp;

ROWID????????????? ROWIDTOCHAR(ROWID) ENAME

------------------ ------------------ ----------

AAAAfKAACAAAAEqAAA AAAAfKAACAAAAEqAAA SMITH

AAAAfKAACAAAAEqAAB AAAAfKAACAAAAEqAAB ALLEN

AAAAfKAACAAAAEqAAC AAAAfKAACAAAAEqAAC WARD

AAAAfKAACAAAAEqAAD AAAAfKAACAAAAEqAAD JONES

43.CONVERT(c,dset,sset)將源字符串 sset從一個語言字符集轉換到另一個目的dset字符集

SQL> select convert('strutz','we8hp','f7dec') "conversion" from dual;

conver

------

strutz

44.HEXTORAW?將一個十六進制構成的字符串轉換為二進制

45.RAWTOHEXT?將一個二進制構成的字符串轉換為十六進制

46.ROWIDTOCHAR?將ROWID數據類型轉換為字符類型

47.TO_CHAR(date,'format')

SQL> select to_char(sysdate,'yyyy/mm/dd hh24:mi:ss') from dual;

TO_CHAR(SYSDATE,'YY

-------------------

2004/05/09 21:14:41

48.TO_DATE(string,'format')?將字符串轉化為ORACLE中的一個日期

49.TO_MULTI_BYTE?將字符串中的單字節字符轉化為多字節字符

SQL> select to_multi_byte('高') from dual;

高

50.TO_NUMBER

將給出的字符轉換為數字

SQL> select to_number('1999') year from dual;

YEAR

---------

1999

51.BFILENAME(dir,file)指定一個外部二進制文件

SQL>insert into file_tb1 values(bfilename('lob_dir1','image1.gif'));

52.CONVERT('x','desc','source')?將x字段或變量的源source轉換為desc

SQL> select sid,serial#,username,decode(command,

2 0,'none',

3 2,'insert',

4 3,

5 'select',

6 6,'update',

7 7,'delete',

8 8,'drop',

9 'other') cmd from v$session where type!='background';

SID?? SERIAL# USERNAME?????????????????????? CMD

--------- --------- ------------------------------ ------

1???????? 1??????????????????????????????? none

2???????? 1??????????????????????????????? none

3???????? 1??????????????????????????????? none

4???????? 1??????????????????????????????? none

5???????? 1??????????????????????????????? none

6???????? 1??????????????????????????????? none

7????? 1275??????????????????????????????? none

8????? 1275??????????????????????????????? none

9??????? 20 GAO??????????????????????????? select

10??????? 40 GAO??????????????????????????? none

總結

以上是生活随笔為你收集整理的oracle SQL以结尾函数,Oracle SQL 内置函数大全的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。

上一篇：一文看懂SMT车间生产环境要求及管理规范
下一篇：加强化工企业危化品管理的几点建议