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如果一個(gè)字符串中有像逗號(hào)或其它符號(hào)分隔,你想把它折分成列,如’first field, second field , third field’,
拆成
first field
second field
third field
第一種 用10G開(kāi)始支持的正則表達(dá)式
anbob@ANBOB>SELECT REGEXP_SUBSTR ('first field, second field , third field', '[^,]+', 1,rownum) 2 FROM DUAL 3 CONNECT BY ROWNUM <= 4 LENGTH ('first field, second field , third field') - LENGTH (REPLACE ('first field, second field , third field', ',', ''))+1; REGEXP_SUBSTR('FIRSTFIELD,SECONDFIELD,THIRDFIELD','[^,]+',1,ROWNUM) ------------------------------------------------------------------------------ first field second field third field
TIP:
REGEXP_SUBSTR 函數(shù)是把那個(gè)串以正則不是以,(逗號(hào))開(kāi)頭的截取,第二個(gè)參數(shù)是取第幾組,rownum偽列序號(hào),connect 循環(huán) ,循環(huán)次數(shù)為串總長(zhǎng)度-去除分隔符后=幾個(gè)分隔符 +1
第二種用type,function
第一,先創(chuàng)建一個(gè)Type
CREATE OR REPLACE TYPE type_split IS TABLE OF VARCHAR2 (4000)
第二,創(chuàng)建函數(shù)
create or replace function split(p_list varchar2,p_sep varchar2 := ’,’) return type_split pipelined IS l_idx pls_integer; v_list varchar2(50) := p_list; begin loop l_idx := instr(v_list,p_sep); if l_idx = 0 then pipe row(substr(v_list,1,l_idx-1)); v_list := substr(v_list,l_idx+length(p_sep)); else pipe row(v_list); exit; end if; end loop; end split;
第三,調(diào)試
select * from table(split(‘a(chǎn)aa,bbb,ccc’,',’));
拆分列字段
anbob@ANBOB>select * from test11; ID NAME -------------------- ---------- 1 a,b,c 2 e,d nbob@ANBOB>with temp0 as (select LEVEL lv from dual CONNECT BY LEVEL <= 100) 2 select id,substr(t.vals,instr(t.vals, ',', 1, tv.lv) + 1, 3 instr(t.vals, ',', 1, tv.lv + 1) -( 4 instr(t.vals, ',', 1, tv.lv) + 1) 5 ) AS name 6 from (select id,',' || name || ',' AS vals, 7 length(name || ',') - nvl(length(REPLACE(name, ',')), 0) AS cnt 8 from test11) t join temp0 tv 9 on tv.lv <= t.cnt order by 1; ID NAME -------------------- ------------------------ 1 a 1 b 1 c 2 d 2 e
擴(kuò)展 regexp_replace
V字段中每個(gè)值中字符串以,分隔,如果不是以9開(kāi)頭那組串加‘00’
anbob@NCME>create table testreg(v varchar2(80));
Table created.
anbob@NCME>insert into testreg values(’911,000,12,31′);
1 row created.
anbob@NCME>insert into testreg values(’11911,554000,312,931′);
1 row created.
anbob@NCME>commit;
Commit complete.
anbob@NCME>select ltrim(regexp_replace(‘,’||v,’([,])’,'\100′),’,') newv,v from testreg;
NEWV V
—————————— ——————————
00911,00000,0012,0031 911,000,12,31
0011911,00554000,00312,00931 11911,554000,312,931
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