oracle 多行,一行转换(10g以上)

--1. 多行转换成一行

-- 1.1 table 语句
CREATE TABLE "LOCAL_WPC04_01"."A_ROW_STR"

   ( "ID" NUMBER(*,0),

 "COL" VARCHAR2(10 BYTE)

   );

Insert into LOCAL_WPC04_01.A_ROW_STR (ID,COL) values (1,'a');

Insert into LOCAL_WPC04_01.A_ROW_STR (ID,COL) values (1,'b');

Insert into LOCAL_WPC04_01.A_ROW_STR (ID,COL) values (1,'c');

Insert into LOCAL_WPC04_01.A_ROW_STR (ID,COL) values (2,'a');

Insert into LOCAL_WPC04_01.A_ROW_STR (ID,COL) values (2,'d');

Insert into LOCAL_WPC04_01.A_ROW_STR (ID,COL) values (2,'e');

Insert into LOCAL_WPC04_01.A_ROW_STR (ID,COL) values (3,'c');
-- 1.2 转换语句 by Hierarchical
SELECT t.id id,

  SUBSTR(sys_connect_by_path(t.col, ','), 2) str

FROM

  (SELECT id,

    col,

    row_number() over(PARTITION BY id ORDER BY col) rn

  FROM a_row_str

  ) t

WHERE connect_by_isleaf = 1

  START WITH rn         = 1

  CONNECT BY rn         = PRIOR rn + 1

AND id                  = PRIOR id;

--2.一行转换成多行

--2.1 table 语句
CREATE TABLE A_STR_ROW

   ( "ID" NUMBER(*,0),

 "STR" VARCHAR2(32 BYTE)

   )；

Insert into LOCAL_WPC04_01.A_STR_ROW (ID,STR) values (1,'a,b,c');

Insert into LOCAL_WPC04_01.A_STR_ROW (ID,STR) values (2,'a,d,e');

Insert into LOCAL_WPC04_01.A_STR_ROW (ID,STR) values (3,'c');

--2.2 转换语句
SELECT id,

LEVEL AS p,

rtrim(regexp_substr(str || ',', '.*?' || ',', 1, LEVEL), ',') AS cv

FROM a_str_row

CONNECT BY id = PRIOR id

AND PRIOR dbms_random.VALUE IS NOT NULL

AND LEVEL <=

length(regexp_replace(str || ',', '[^' || ',' || ']', NULL))

ORDER BY 1, 2;

--3. 多行转换成一行 for user_tab_columns

SELECT DISTINCT t.table_name tabname,

    LISTAGG(t.column_name,',') within GROUP(

  ORDER BY t.column_id ASC) OVER (PARTITION BY table_name) AS colname

  FROM user_tab_columns t