SELECT REPLACE(WM_CONCAT(A.COLUMN_NAME), ',', '||'',''||')
  FROM ALL_COL_COMMENTS A

CREATE OR REPLACE FUNCTION GET_TABLE_COLUMS(IS_OWNER      IN VARCHAR2,
                                            IS_TABLE_NAME IN VARCHAR2,
                                            IS_STR        IN VARCHAR2 := ',')

 RETURN VARCHAR2 IS
  RESULT VARCHAR2(32767);
  CV     CLOB := '';
  TYPE REF_CURSOR_TYPE IS REF CURSOR;
  COLUMNS_CUR  REF_CURSOR_TYPE;
  VAL          VARCHAR2(100);
  V_OWNER      VARCHAR2(100);
  V_TABLE_NAME VARCHAR2(200);
  V_R          NUMBER := 0;
  V_STR        VARCHAR2(100);
BEGIN

  V_OWNER      := IS_OWNER;
  V_TABLE_NAME := IS_TABLE_NAME;
  V_STR        := IS_STR;

  OPEN COLUMNS_CUR FOR
    SELECT B.COLUMN_NAME AS COLUMN_NAME
      FROM ALL_TAB_COLUMNS B
     WHERE B.TABLE_NAME = V_TABLE_NAME
       AND B.OWNER = V_OWNER
     ORDER BY B.COLUMN_ID;
  LOOP
    FETCH COLUMNS_CUR
      INTO VAL;
    EXIT WHEN COLUMNS_CUR%NOTFOUND;
  
    IF MOD(V_R, 5) = 0
    THEN
      CV  := CV || V_STR || CHR(10) || VAL;
      V_R := 0;
    ELSE
      CV := CV || V_STR || VAL;
    END IF;
    V_R := V_R + 1;
  END LOOP;
  DBMS_OUTPUT.PUT_LINE(V_STR || ':' || LENGTH(V_STR));
  CV     := SUBSTR(CV, LENGTH(V_STR) + 2); -- 移除逗号和换行
  RESULT := TO_CHAR(CV);
  CLOSE COLUMNS_CUR;
  CV := '';
  RETURN(RESULT);
END GET_TABLE_COLUMS;

CREATE OR REPLACE PROCEDURE SQL_TO_CSV(P_QUERY    IN VARCHAR2, -- PLSQL文
                                       P_DIR      IN VARCHAR2, -- 导出的文件放置目录
                                       P_FILENAME IN VARCHAR2 -- CSV名
                                       ) IS
  L_OUTPUT       UTL_FILE.FILE_TYPE;
  L_THECURSOR    INTEGER DEFAULT DBMS_SQL.OPEN_CURSOR;
  L_COLUMNVALUE  VARCHAR2(4000);
  L_STATUS       INTEGER;
  L_COLCNT       NUMBER := 0;
  L_SEPARATOR    VARCHAR2(1);
  L_DESCTBL      DBMS_SQL.DESC_TAB;
  P_MAX_LINESIZE NUMBER := 32000;

BEGIN
  --OPEN FILE
  L_OUTPUT := UTL_FILE.FOPEN(P_DIR, P_FILENAME, 'W', P_MAX_LINESIZE);
  --DEFINE DATE FORMAT
  EXECUTE IMMEDIATE 'ALTER SESSION SET NLS_DATE_FORMAT=''YYYY-MM-DD HH24:MI:SS''';
  --OPEN CURSOR
  DBMS_SQL.PARSE(L_THECURSOR, P_QUERY, DBMS_SQL.NATIVE);
  DBMS_SQL.DESCRIBE_COLUMNS(L_THECURSOR, L_COLCNT, L_DESCTBL);
  --DUMP TABLE COLUMN NAME
  FOR I IN 1 .. L_COLCNT LOOP
    UTL_FILE.PUT(L_OUTPUT,
                 L_SEPARATOR || '"' || L_DESCTBL(I).COL_NAME || '"'); --输出表字段
    DBMS_SQL.DEFINE_COLUMN(L_THECURSOR, I, L_COLUMNVALUE, 4000);
    L_SEPARATOR := ',';
  END LOOP;
  UTL_FILE.NEW_LINE(L_OUTPUT); --输出表字段
  --EXECUTE THE QUERY STATEMENT
  L_STATUS := DBMS_SQL.EXECUTE(L_THECURSOR);


  --DUMP TABLE COLUMN VALUE
  WHILE (DBMS_SQL.FETCH_ROWS(L_THECURSOR) > 0) LOOP
    L_SEPARATOR := '';
    FOR I IN 1 .. L_COLCNT LOOP
      DBMS_SQL.COLUMN_VALUE(L_THECURSOR, I, L_COLUMNVALUE);
      UTL_FILE.PUT(L_OUTPUT,
                   L_SEPARATOR || '"' ||
                   TRIM(BOTH ' ' FROM REPLACE(L_COLUMNVALUE, '"', '""')) || '"');
      L_SEPARATOR := ',';
    END LOOP;
    UTL_FILE.NEW_LINE(L_OUTPUT);
  END LOOP;
  --CLOSE CURSOR
  DBMS_SQL.CLOSE_CURSOR(L_THECURSOR);
  --CLOSE FILE
  UTL_FILE.FCLOSE(L_OUTPUT);
EXCEPTION
  WHEN OTHERS THEN
    RAISE;
END;

SELECT TO_CHAR(TO_DATE('19000101', 'YYYYMMDD') + ROWNUM - 1, 'YYYYMMDD') AS DATA_DATE
  FROM DUAL
CONNECT BY ROWNUM <= TRUNC(TO_DATE('20210616', 'YYYYMMDD') + 1 -
                           TO_DATE('19000101', 'YYYYMMDD'));

WITH X0 AS
 (SELECT TO_DATE('2020-01-01', 'yyyy-MM-dd') AS 年初,
         TO_DATE('2020-02-29', 'yyyy-MM-dd') AS 年末
    FROM DUAL),
X1 AS
 (SELECT 年初 + LEVEL - 1 AS 日期
    FROM X0
  CONNECT BY LEVEL <= (年末 - 年初) + 1),
X2 AS
 (SELECT 日期, TO_NUMBER(TO_CHAR(日期, 'd')) 周几 FROM X1)
SELECT 日期,
       (CASE
         WHEN 周几 = 1
              OR 周几 = 7 THEN
          '1'
         ELSE
          '0'
       END) AS 工作日标志
  FROM X2;