How to put a text in Child query

Question

HI,
I need to put a text when dont find child records which says "PO not found",
Oracle 10G
report design consist of one man group and child records
ex:
main subquery
P44001 desc BOMqty total date1 qty line1 ponum1
....................................date2 qty line12 ponum1
....................................date2 qty line3 ponum2
P44002 desc BOMqty total “no po found”
P44003 desc BOMqty total date4 qty line4 ponum1
....................................... date2 qty line2 ponum1
....................................... date2 qty line5 ponum2
Thanks,
Harsha

Answer 1

Hi, Harsha,
That sounds like a job for OUTER JOIN.
For example, using scott's tables:
SELECT       d.deptno
,       d.dname
,       NVL2 ( e.deptno
            , e.ename
            , 'No emp found'
            )     AS ename
FROM              scott.dept  d
LEFT OUTER JOIN      scott.emp   e  ON  e.deptno  = d.deptno
ORDER BY  d.deptno
;Output:
`   DEPTNO    DNAME             ENAME
        10    ACCOUNTING        CLARK
        10    ACCOUNTING        KING
        10    ACCOUNTING        MILLER
        20    RESEARCH          JONES
        20    RESEARCH          FORD
        20    RESEARCH          ADAMS
        20    RESEARCH          SMITH
        20    RESEARCH          SCOTT
        30    SALES             WARD
        30    SALES             TURNER
        30    SALES             ALLEN
        30    SALES             JAMES
        30    SALES             BLAKE
        30    SALES             MARTIN
        40    OPERATIONS        No emp foundNote deptno=40, which occurs in dept, but not in emp.
If ename happened to be NULL in emp, then the NULL would appear in the ename column. If ename can not be NULL, then you can replace the NVL2 expression witH
NVL (e,ename, 'No emp found') 
I hope this answers your question.
If not, post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) for all tables involved, and also post the results you want from that data.
Explain, using specific examples, how you get those results from that data.
If you can show the problem using commonly available tables (such as those in the scott schema) then you don't have to post any sample data: just post the results and the explanation.
Always say which version of Oracle you're using (e.g., 10.2.0.4.0). There is no version 10<b>F</b> or 10<b>H</b>, so it's kind of silly to say you have 10<b>G</b>
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