ORACLEº¯Êý´óÈ«
SQLÖеĵ¥¼Ç¼º¯Êý
1.ASCII
·µ»ØÓëÖ¸¶¨µÄ×Ö·û¶ÔÓ¦µÄÊ®½øÖÆÊý;
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
¸ø³öÕûÊý,·µ»Ø¶ÔÓ¦µÄ×Ö·û;
SQL> select chr(54740) zhao,chr(65) chr65 from dual;
ZH C
-- -
ÕÔ A
3.CONCAT
Á¬½ÓÁ½¸ö×Ö·û´®;
SQL> select concat('010-','88888888')||'ת23' ¸ßǬ¾ºµç»° from dual;
¸ßǬ¾ºµç»°
----------------
010-88888888ת23
4.INITCAP
·µ»Ø×Ö·û´®²¢½«×Ö·û´®µÄµÚÒ»¸ö×Öĸ±äΪ´óд;
SQL> select initcap('smith') upp from dual;
UPP
-----
Smith
5.INSTR(C1,C2,I,J)
ÔÚÒ»¸ö×Ö·û´®ÖÐËÑË÷Ö¸¶¨µÄ×Ö·û,·µ»Ø·¢ÏÖÖ¸¶¨µÄ×Ö·ûµÄλÖÃ;
C1 ±»ËÑË÷µÄ×Ö·û´®
C2 Ï£ÍûËÑË÷µÄ×Ö·û´®
I ËÑË÷µÄ¿ªÊ¼Î»ÖÃ,ĬÈÏΪ1
J ³öÏÖµÄλÖÃ,ĬÈÏΪ1
SQL> select instr('oracle traning','ra',1,2) instring from dual;
INSTRING
---------
9
6.LENGTH
·µ»Ø×Ö·û´®µÄ³¤¶È;
SQL> select name,length(name),addr,length(addr),sal,length(to_char(sal)) from gao.nchar_tst;
NAME LENGTH(NAME) ADDR LENGTH(ADDR) SAL LENGTH(TO_CHAR(SAL))
------ ------------ ---------------- ------------ --------- --------------------
¸ßǬ¾º 3 ±±¾©Êк£¶§Çø 6 9999.99 &nbs
Ïà¹ØÎĵµ£º
PL/SQL
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DECLARE
ÉùÃ÷²¿·Ö
BEGIN
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EXCEPTION
Òì³£´¦Àí²¿·Ö
END;
Àý£º
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1.ÉùÃ÷£º
a.¸ñʽ£ºVariable_name [constant] databyte [not null] [:=default expression]
b.±äÁ¿Óë³£Á¿ÉùÃ÷»ù±¾Ò»Ö£¬Ê¹ÓÃconstantÉùÃ÷µÄΪ³£Á¿£¬²»Ê¹ÓÃΪ±äÁ¿£¬²¢ÇÒ¸³ÖµÖ»ÄÜÔÚDECLAREÇøÓò¸³Öµ£»
c.ʹÓÃ%TYPEºÍ%ROWTYPEÉùÃ÷¿ÉÒÔʹ±äÁ¿µÄÀàÐÍÓë±íÖÐ×Ö¶ÎÀàÐÍ»òÕû¸ö¼Ç¼ÀàÐͱ ......
OracleË÷Òý·ÖÇøÔÓ̸
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oracleΪ³£¼û´íÎóÔ¤¶¨Òå
ÔÚDBMS_STANDARD³ÌÐò°üÖÐÌṩÁËÕâЩ¶¨Òå
²»ÐèÒªÏÔʾÉùÃ÷
declare
sex student.stu_sex%type;
begin
select stu_sex into sex from student;
dbms_output.put_line('sex:'||sex);
exception
&nbs ......