Joining Two Tables based on Conditions.
Hi All,
i would like to join two tables emp and dept with conditional join like
for example: select emp.column1...............
left outer join DEPT ON if Dept.column1='A" then emp.column1=dept.column1
else emp.column2=dept.column3
i know that bu using the UNION we can dothis, but i donot want to USE UNION.
please let me know if any workaround for this.
Thanks,
Kalyan
SQL> select * from etl
2 /
EMPNO ENAME JOB MGR SAL COMM DEPTNO AAA DEPT_NO
7566 JONES MANAGER 7839 2975 20 2 20
7654 MARTIN SALESMAN 7698 1250 1400 30 3 10
7698 BLAKE MANAGER 7839 2850 30 3 10
7782 CLARK MANAGER 7839 2450 10 1 20
7788 SCOTT ANALYST 7566 3000 20 2 20
7839 KING PRESIDENT 5000 10 1 20
7844 TURNER SALESMAN 7698 1500 30 3 10
7876 ADAMS CLERK 7788 1100 20 2 20
7900 JAMES CLERK 7698 950 30 3 10
7902 FORD ANALYST 7566 3000 20 2 20
7934 MILLER5 CLERK 7782 1300 10 1 20
7936 MILLER7 CLERK 7782 1300 10 1 20
12 rows selected.
SQL> select * from dept;
DEPTNO DNAME LOC
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS BOSTON
SQL> ed
Wrote file afiedt.buf
1 select
2 e.empno,
3 e.ename,
4 e.deptno,
5 aaa,
6 e.dept_no,
7 d.deptno,
8 d.dname
9 from
10 etl e ,
11 dept d
12 where
13 (e.aaa =1 and e.deptno = d.deptno) or
14* (e.aaa =2 and e.dept_no =d.deptno)
SQL> /
EMPNO ENAME DEPTNO AAA DEPT_NO DEPTNO DNAME
7566 JONES 20 2 20 20 RESEARCH
7788 SCOTT 20 2 20 20 RESEARCH
7876 ADAMS 20 2 20 20 RESEARCH
7902 FORD 20 2 20 20 RESEARCH
7782 CLARK 10 1 20 10 ACCOUNTING
7839 KING 10 1 20 10 ACCOUNTING
7934 MILLER5 10 1 20 10 ACCOUNTING
7936 MILLER7 10 1 20 10 ACCOUNTING
8 rows selected.Regards
Singh
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Hi all,
Assume that someone needs to join two tables called PA0002 and PA0008 with keyword PERNR and
that person needs to read the data of PA0008 aedtm's max.
That is there are many records based on the aedtm and the user wants to read the last date update and wants to use this in join, not separately.
Any idea?
Thanks.
denizhi use this..
report.
tables:pa0002,pa0008.
data: begin of itab occurs 0,
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nachn like pa0002-nachn,
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endda like pa0002-endda,
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data: begin of itab1 occurs 0,
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stvor like pa0008-stvor,
ansal like pa0008-ansal,
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data:begin of final occurs 0,
pernr like pa0002-pernr,
vorna like pa0002-vorna,
nachn like pa0002-nachn,
begda like pa0008-begda,
stvor like pa0008-stvor,
ansal like pa0008-ansal,
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select-options:s_pernr for pa0002-pernr.
start-of-selection.
select pernr
vorna
nachn
begda
endda
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select pernr
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stvor
ansal
from pa0008
into table itab1
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sort itab1 by pernr begda descending.
loop at itab.
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final-vorna = itab-vorna.
final-nachn = itab-nachn.
read table itab1 with key pernr = itab-pernr.
final-begda = itab1-begda.
final-stvor = itab1-stvor.
final-ansal = itab1-ansal.
append final.
clear final.
endloop.
loop at final.
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Thank You Warmest Fanny PiedPlease take a look at these links related to your query.
http://stackoverflow.com/questions/5145637/querying-data-by-joining-two-tables-in-two-database-on-different-servers
http://stackoverflow.com/questions/7037228/joining-two-tables-together-in-one-database -
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I have tried group by and rollup and xmlagg.
Thank you very, very much for your help.
JimHi, Jim,
Welcome to the forum!
You just want to display the XML, not actually transform it, right?
GROUP BY ROLLUP should work, but I find it easier with GROUP BY GROUPING SETS. Here's an example from tables in the scott schema:
SELECT CASE
WHEN GROUPING (ename) = 1
THEN d.dname
END AS dname
, e.ename
FROM scott.dept d
JOIN scott.emp e ON d.deptno = e.deptno
GROUP BY GROUPING SETS ( (d.dname, e.ename)
, (d.dname)
ORDER BY d.dname
, ename NULLS FIRST
;Output:
DNAME ENAME
ACCOUNTING
CLARK
KING
MILLER
RESEARCH
ADAMS
FORD
JONES
SCOTT
SMITH
SALES
ALLEN
BLAKE
JAMES
MARTIN
TURNER
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