SQL将字符串拆分为每行中的每个字母

我用case从表中获取字符串，将其拆分为字母，每个字母表示活动/非活动0/1，然后从另一个表中返回一个单元格中所有活动字母的说明。。 注：字母顺序与其他表格相同

这就是我的情况：

CREATE TABLE Strings_tab
(
   Str_id     NUMBER,
   Str_text   VARCHAR2 (40)
);

CREATE TABLE Reprsnt_Tab
(
   rep_id     NUMBER,
   rep_text   VARCHAR2 (40)
);

INSERT INTO Strings_tab VALUES (1, '1111111111000000000011111111110000000000');
INSERT INTO Strings_tab VALUES (2, '0000011111000001111100000111110000011111');

INSERT INTO Reprsnt_Tab VALUES (1, 'rep1');
INSERT INTO Reprsnt_Tab VALUES (2, 'rep2');
INSERT INTO Reprsnt_Tab VALUES (3, 'rep3');   
INSERT INTO Reprsnt_Tab VALUES (4, 'rep4');
INSERT INTO Reprsnt_Tab VALUES (5, 'rep5');
INSERT INTO Reprsnt_Tab VALUES (6, 'rep6');
INSERT INTO Reprsnt_Tab VALUES (7, 'rep7');
INSERT INTO Reprsnt_Tab VALUES (8, 'rep8');
INSERT INTO Reprsnt_Tab VALUES (9, 'rep9');
INSERT INTO Reprsnt_Tab VALUES (10, 'rep10');
INSERT INTO Reprsnt_Tab VALUES (11, 'rep11');
INSERT INTO Reprsnt_Tab VALUES (12, 'rep12');
INSERT INTO Reprsnt_Tab VALUES (13, 'rep13');
INSERT INTO Reprsnt_Tab VALUES (14, 'rep14');
INSERT INTO Reprsnt_Tab VALUES (15, 'rep15');
INSERT INTO Reprsnt_Tab VALUES (16, 'rep16');
INSERT INTO Reprsnt_Tab VALUES (17, 'rep17');
INSERT INTO Reprsnt_Tab VALUES (18, 'rep18');
INSERT INTO Reprsnt_Tab VALUES (19, 'rep19');
INSERT INTO Reprsnt_Tab VALUES (20, 'rep20');
INSERT INTO Reprsnt_Tab VALUES (21, 'rep21');
INSERT INTO Reprsnt_Tab VALUES (22, 'rep22');
INSERT INTO Reprsnt_Tab VALUES (23, 'rep23'); 
INSERT INTO Reprsnt_Tab VALUES (24, 'rep24');
INSERT INTO Reprsnt_Tab VALUES (25, 'rep25');
INSERT INTO Reprsnt_Tab VALUES (26, 'rep26');
INSERT INTO Reprsnt_Tab VALUES (27, 'rep27');
INSERT INTO Reprsnt_Tab VALUES (28, 'rep28');
INSERT INTO Reprsnt_Tab VALUES (29, 'rep29');
INSERT INTO Reprsnt_Tab VALUES (30, 'rep30');
INSERT INTO Reprsnt_Tab VALUES (31, 'rep31');
INSERT INTO Reprsnt_Tab VALUES (32, 'rep32');
INSERT INTO Reprsnt_Tab VALUES (33, 'rep33');
INSERT INTO Reprsnt_Tab VALUES (34, 'rep34');
INSERT INTO Reprsnt_Tab VALUES (35, 'rep35');
INSERT INTO Reprsnt_Tab VALUES (36, 'rep36');
INSERT INTO Reprsnt_Tab VALUES (37, 'rep37');
INSERT INTO Reprsnt_Tab VALUES (38, 'rep38');
INSERT INTO Reprsnt_Tab VALUES (39, 'rep39');  
INSERT INTO Reprsnt_Tab VALUES (40, 'rep40');

COMMIT;

这是我的疑问：

SELECT STR_TEXT,
       RTRIM (
          XMLAGG (XMLELEMENT (E, DATA.REP_TEXT || ',' || CHR (10))).EXTRACT (
             '//text()'),
          ',')
          REPS
  FROM (  SELECT LETTER,
                 STR_ID,
                 LVL,
                 STR_TEXT,
                 REP_TEXT
            FROM (    SELECT DISTINCT SUBSTR (A.STR_TEXT, LEVEL, 1) LETTER,
                                      A.STR_ID,
                                      LEVEL LVL,
                                      A.STR_TEXT
                        FROM STRINGS_TAB A
                  CONNECT BY LEVEL <= LENGTH (A.STR_TEXT) ---- HERE IS MY PROBLEM
                                        ) TXT,
                 (  SELECT ROWNUM RN, REPRSNT_TAB.*
                      FROM REPRSNT_TAB
                  ORDER BY REP_ID) B
           WHERE B.RN = TXT.LVL AND LETTER = 1
        ORDER BY STR_ID, STR_TEXT, LVL) DATA
        GROUP BY STR_TEXT

我的方法是在一个包含多行的表中使用CONNECT BY LEVEL将CONNECT BY连接到辅助表，这不是一个好主意。看：

我的答案是：

  SELECT str_text,
         LISTAGG (DATA.REP_TEXT, ',' || CHR (10))
            WITHIN GROUP (ORDER BY DATA.rn_rep)
            reps
    FROM (SELECT *
            FROM (  SELECT str_text, SUBSTR (str_text, rn, 1) OneDigit, rn
                      FROM (SELECT str_text FROM STRINGS_TAB) txt,
                           (    SELECT ROWNUM rn
                                  FROM DUAL
                            CONNECT BY LEVEL <=
                                          (SELECT MAX (LENGTH (str_text))
                                             FROM STRINGS_TAB)) rep
                     WHERE REP.RN <= LENGTH(str_text)
                  ORDER BY Str_text, rn) xx,
                 (  SELECT ROWNUM rn_rep, rep_text
                      FROM REPRSNT_TAB
                  ORDER BY rn_rep) desc_rep
           WHERE desc_rep.rn_rep = xx.rn AND OneDigit = 1) data
GROUP BY str_text

---

table Reprsnt_选项卡聚合为一个XMLElemtent。要访问选定行，您只需执行$doc/rows/row[$selected\u row\u nr]/text

thank you@vercelli。。这是一个很棒的问题，这就是我需要的。。我靠得太近了，解决不了这个问题。。哈哈，对不起，但是rep6、rep40、rep39的表示形式没有顺序，因为它在表REPRSNT_选项卡中。。因此，我更改了查询。。看看我的答案@vercelli@boshkash12当前位置很高兴你觉得它很有用，表示感谢的方式是投票并接受答案，如果你觉得它很有用，这意味着不仅仅是感谢，而且你对他们的努力是有回报的

with aux as (select level as lvl
               from dual
              connect by level <= (select max(length(str_text)) from  strings_tab))
SELECT STR_TEXT,
       RTRIM (
          XMLAGG (XMLELEMENT (E, DATA.REP_TEXT || ',' || CHR (10))).EXTRACT (
             '//text()'),
          ',')
          REPS
  FROM (  SELECT LETTER,
                 STR_ID,
                 LVL,
                 STR_TEXT,
                 REP_TEXT
            FROM (    SELECT DISTINCT SUBSTR (A.STR_TEXT, LVL, 1) LETTER,
                                      A.STR_ID,
                                      LVL,
                                      A.STR_TEXT
                        FROM STRINGS_TAB A join aux x on x.lvl <=LENGTH (A.STR_TEXT)
                                        ) TXT,
                 (  SELECT ROWNUM RN, REPRSNT_TAB.*
                      FROM REPRSNT_TAB
                  ORDER BY REP_ID) B
           WHERE B.RN = TXT.LVL AND LETTER = 1
        ORDER BY STR_ID, STR_TEXT, LVL) DATA
        GROUP BY STR_TEXT;

STR_TEXT                                    REPS
0000011111000001111100000111110000011111    rep6,rep40,rep39,rep38,rep37,rep36,rep30,rep29,rep28,rep27,rep26,rep20,rep19,rep18,rep17,rep16,rep10,rep9,rep8,rep7
1111111111000000000011111111110000000000    rep1,rep30,rep29,rep28,rep27,rep26,rep25,rep24,rep23,rep22,rep21,rep10,rep9,rep8,rep7,rep6,rep5,rep4,rep3,rep2

  SELECT str_text,
         LISTAGG (DATA.REP_TEXT, ',' || CHR (10))
            WITHIN GROUP (ORDER BY DATA.rn_rep)
            reps
    FROM (SELECT *
            FROM (  SELECT str_text, SUBSTR (str_text, rn, 1) OneDigit, rn
                      FROM (SELECT str_text FROM STRINGS_TAB) txt,
                           (    SELECT ROWNUM rn
                                  FROM DUAL
                            CONNECT BY LEVEL <=
                                          (SELECT MAX (LENGTH (str_text))
                                             FROM STRINGS_TAB)) rep
                     WHERE REP.RN <= LENGTH(str_text)
                  ORDER BY Str_text, rn) xx,
                 (  SELECT ROWNUM rn_rep, rep_text
                      FROM REPRSNT_TAB
                  ORDER BY rn_rep) desc_rep
           WHERE desc_rep.rn_rep = xx.rn AND OneDigit = 1) data
GROUP BY str_text

select Str_id
      ,Str_text
      ,xmlquery('let $abc :=  for $i in 1 to string-length($str) 
                              where substring($str, $i, 1) = "1" 
                                   return $data/rows/row[$i]/text() 
                    return  string-join( $abc, ",")' 
        passing   Str_text as "str"
              , (select xmlelement("rows",xmlagg(xmlelement( "row",rep_text)  order by rep_id)) from Reprsnt_Tab) as "data" 
       returning content
     ) from Strings_tab