Question

代码的输出不应覆盖空值。我需要附带格式的输出（第一输出），它以不同的格式显示（第二输出）。请建议我如何实现此目标。

    SELECT plan_category.id,plan_category.category AS OPTION,
           max(CASE WHEN plan ='Business' THEN plan_category_detail.description ELSE '' END) AS Business,
           max(CASE WHEN plan ='Holiday' THEN plan_category_detail.description ELSE '' END) AS Holiday,
           max(CASE WHEN plan ='Schengen' THEN plan_category_detail.description ELSE '' END) AS Schengen,
           max(CASE WHEN plan ='Student' THEN plan_category_detail.description ELSE '' END) AS Student,
           max(CASE WHEN plan ='Senior' THEN plan_category_detail.description ELSE '' END) AS Senior,
           max(CASE WHEN plan ='Incoming' THEN plan_category_detail.description ELSE '' END) AS Incoming,
           max(CASE WHEN plan ='East Africa' THEN plan_category_detail.description ELSE '' END) AS East_Africa
FROM travel_plan INNER JOIN plan_category_detail ON plan_category_detail.travel_plan_id = travel_plan.id 
INNER JOIN plan_category ON plan_category.id = plan_category_detail.plan_category_id  
GROUP BY plan_Category_detail.id , plan_category.id

Customer_ID         Event_ID   Supp_CD
(null)              2534660914  (null)
(null)              2534660913  (null)
4000000000033919590 2534660916  (null)
7000000000491566892 2534660918  (null)
7000000000888215846 2534660917  (null)
7000000000945520325 2534660912  (null)
7000000000862996964 2534660919  (null)
7000000000554412111 2534660915  (null)

我已经编写了SQL脚本，但是DBMS_OUTPUT的格式化会覆盖空输出。最后一个字段SUPP_CD是文本，前两列由数字组成。

Customer_ID         Event_ID   Supp_CD
2534660914  
2534660913  
4000000000033919590 2534660916  
7000000000491566892 2534660918  
7000000000888215846 2534660917  
7000000000945520325 2534660912  
7000000000862996964 2534660919  
7000000000554412111 2534660915

我尝试通过将以下行替换为IF语句来编写下面的代码

SET SERVEROUTPUT ON FORMAT WRAPPED
SET VERIFY OFF
SET FEEDBACK OFF
SET TERMOUT ON

SPOOL /u01/apps/Miscellaneous/bin/spool.txt

DECLARE
  CSTID CDB_ADMIN.CPM_PREF_EVENT_STG.cdb_customer_id%TYPE;
  EVNTID CDB_ADMIN.CPM_PREF_EVENT_STG.cdb_pref_event_id%TYPE;
  SUPCD CDB_ADMIN.CPM_PREF_EVENT_STG.supp_cd%TYPE;
  COUNTS INTEGER:=0;

  cursor c1 is
    <select * from A.B>;

BEGIN
  DBMS_OUTPUT.PUT_LINE(LPAD('Customer_ID',25)||LPAD('Event_ID',25)||RPAD('Supp_ID',25));

  OPEN C1;
  LOOP
    FETCH C1 INTO CSTID,EVNTID,SUPCD;
    EXIT WHEN C1%NOTFOUND;
    DBMS_OUTPUT.put_line(LPAD(CSTID,25)||LPAD(EVNTID,25)||RPAD(SUPCD,25));
    COUNTS := COUNTS+1;
  END LOOP;
  CLOSE C1;

  DBMS_OUTPUT.PUT_LINE('');
  DBMS_OUTPUT.PUT_LINE('NUMBER OF ROWS: ' || COUNTS);
END;
/

SPOOL OFF;

DBMS_OUTPUT.put_line(LPAD(CSTID,25)||LPAD(EVNTID,25)||RPAD(SUPCD,25));

输出为

IF CSTID is null then
dbms_output.put_line(LPAD(coalesce(null,' '),25)||LPAD(EVNTID,25)||'  '||RPAD(SUPCD,40));
end if;
IF EVNTID is null then
dbms_output.put_line(LPAD(CSTID,25)||LPAD(coalesce(null,' '),25)||'  '||RPAD(SUPCD,40));
end if;
IF SUPCD is null then
dbms_output.put_line(LPAD(CSTID,25)||LPAD(EVNTID,25)||'  '||RPAD(coalesce(null,' '),40));
end if;

仍在寻找解决方案。请让我知道是否可以通过更好的方式完成。

Answer 1

您需要按以下内容替换行：DBMS_OUTPUT.put_line(LPAD(CSTID,25)||LPAD(EVNTID,25)||RPAD(SUPCD,25));，否则其他代码将正常工作

DBMS_OUTPUT.PUT_LINE(
    CASE
        WHEN CSTID IS NULL AND EVNTID IS NULL THEN LPAD(SUPCD, 25)
        WHEN CSTID IS NULL THEN
            CASE
                WHEN SUPCD IS NULL THEN LPAD(EVNTID, 25)
                ELSE LPAD(EVNTID, 25)
                     || RPAD(SUPCD, 25)
            END
        WHEN EVNTID IS NULL THEN
            CASE
                WHEN SUPCD IS NULL THEN LPAD(CSTID, 25)
                ELSE LPAD(CSTID, 25)
                     || RPAD(SUPCD, 25)
            END
        ELSE
            CASE
                WHEN SUPCD IS NULL THEN LPAD(CSTID, 25)
                                        || LPAD(EVNTID, 25)
                ELSE LPAD(CSTID, 25)
                     || LPAD(EVNTID, 25)
                     || RPAD(SUPCD, 25)
            END
    END
);

希望，这会有所帮助。

DBMS_OUTPUT.PUT_LINE(RPAD('Customer_ID',20)||RPAD('Event_ID',20)||RPAD('Supp_ID',20));
DBMS_OUTPUT.PUT_LINE(
    CASE
        WHEN CSTID IS NULL AND EVNTID IS NULL THEN RPAD(SUPCD, 20)
        WHEN CSTID IS NULL THEN
            CASE
                WHEN SUPCD IS NULL THEN RPAD(EVNTID, 20)
                ELSE RPAD(EVNTID, 20)
                     || RPAD(SUPCD, 20)
            END
        WHEN EVNTID IS NULL THEN
            CASE
                WHEN SUPCD IS NULL THEN RPAD(CSTID, 20)
                ELSE RPAD(CSTID, 20)
                     || RPAD(SUPCD, 20)
            END
        ELSE
            CASE
                WHEN SUPCD IS NULL THEN RPAD(CSTID, 20)
                                        || RPAD(EVNTID, 20)
                ELSE RPAD(CSTID, 20)
                     || RPAD(EVNTID, 20)
                     || RPAD(SUPCD, 20)
            END
    END
);
END;
/

DB Fiddle并带有少量示例

干杯！

---------- 更新 ----------

您可以使用以下DBMS_OUPUT：

DBMS_OUTPUT.PUT_LINE(
    CASE 
    WHEN CSTID IS NOT NULL THEN RPAD(CSTID, 20) 
    ELSE RPAD(' ', 20) 
    END
    ||
    CASE 
    WHEN EVNTID IS NOT NULL THEN RPAD(EVNTID, 20) 
    ELSE RPAD(' ', 20) 
    END
    ||
    CASE 
    WHEN SUPCD IS NOT NULL THEN RPAD(SUPCD, 20) 
    ELSE RPAD(' ', 20) 
    END
);

DB<>fiddle demo

干杯！

Answer 2

您可以使用coalesce


begin
  dbms_output.put_line(LPAD('Customer_ID',25,'.')||LPAD('Event_ID',25,'.'));
  dbms_output.put_line(LPAD(coalesce(null,' '),25,'.')||LPAD('2534660914',25,'.'));
end;
/

dbms_output：

..............Customer_ID.................Event_ID
........................ ...............2534660914

db <>提琴here

空输出将被下一个输出覆盖

2 个答案: