很有用的oracle 函數

insert into MILY: 宋體; mso-ascii-font-family: "Times New Roman"; mso-hansi-font-family: "Times New Roman"">表名

select a.imarkno,

substr(b.字段b,INSTR(b.字段b,',',1,1)+1,INSTR(b.字段b,',',1,2)-INSTR(b.字段b,',',1,1)-1),

substr(b.字段b,INSTR(b.字段b,',',1,2)+1,INSTR(b.字段b,',',1,3)-INSTR(b.字段b,',',1,2)-1),

substr(b.字段b,INSTR(b.字段b,',',1,3)+1,INSTR(b.字段b,',',1,4)-INSTR(b.字段b,',',1,3)-1),

b.wangzhanlx,

substr(b.domainname,INSTR(b.domainname,',',1,1)+1,INSTR(b.domainname,',',1,2)-INSTR(b.domainname,',',1,1)-1),

substr(b.domainname,INSTR(b.domainname,',',1,2)+1,INSTR(b.domainname,',',1,3)-INSTR(b.domainname,',',1,2)-1),

substr(b.domainname,INSTR(b.domainname,',',1,3)+1,INSTR(b.domainname,',',1,4)-INSTR(b.domainname,',',1,3)-1),

c.glsj,

c.glbp,

'ywtxdz'

from wzba_identifier a,wzba_mingchengfb b,wzba_beianfb c

where a.iba_id=b.mc_id and a.iba_id=c.ba_id;

INSTR(<c1>,<c2>[,<i>[,<j>]]) 在c1中從位置i開始查找c2在c1中出第j次的位置，i可以為負(此時，從c1的尾部開始)。