Xpath union operator (|)

I am having trouble using the xpath union operator (|).
The selectNodes method of the oracle.xml.parser.v2.XMLNode is throwing an exception when I use any xPath expression with a pipe such as the one below. Does the Oracle Parser support this type of xPath operator?
Thanks,
Michael
//test/me[@id=3|@id=5]
<test>
<me id="5">you</me>
<me id="3">be</me>
</test>

I discovered that this XPath returns the expected result:
//test/me[@id=3]|//test/me[@id=5]

Similar Messages

While doing union operation, i am getting the following eror.

While doing union operation, i am getting the following eror.
Solution for the following error
"Numbers of columns and their data types must be consistent across all criteria and Result Columns"

Hi...phani..thanks for the response..
Report 1: TopN values... working fine
Report2: >TopN values working fine.
when i union the 2 the result is: all records, and i got it.
ReQ: i have to add the remaining Records of >N at the end of the report, represents Others: xxxx
My ReQ:
Col1 Col2 Col3 # of Srs %Of Srs
ABC Complaint Operation 200 40%
CDF ACD Part Availability 100 20%
Others 300 40%
suppose for first column in result tab,
Formula tab: case when saw_4>10 then 'Others' else saw_0 end.
when i put the above condition in Result columns i am getting the error.
Error: Numbers of columns and their data types must be consistent across all criteria and Result Columns

Writing query using UNION Operator

Question -
(1)
Write an SQL Statement to list the following items: Customer ID, Customer Name, number of invoices, sum of total for invoices. Ensure that all customers are returned in the result set.
Answer for the above is written as below by one person. That seams to be correct. Is there another way of writing this same query.;
select c.CUSTOMER_ID,c.NAME,i.cnt,i.s
from gee_customer c,(select customer_id,count(*) as cnt, sum(TOTAL) as s
from gee_invoice
group by customer_id) i
where c.CUSTOMER_ID = i.customer_id (+)
(2)
My other question is How to write the above answer (or what you sugest) using UNION operator ?
Any ideas please
Message was edited by:
user483578

In fact the outer join means you use the union of two result sets - usual join result
and the rows from the outer table for which there is not any row in the inner table.
SQL> select d.deptno, e.ename from emp e, dept d
2 where d.deptno = e.deptno(+)
3 order by 1,2
4 /
    DEPTNO ENAME
        10 CLARK
        10 KING
        10 MILLER
        20 ADAMS
        20 FORD
        20 JONES
        20 SCOTT
        20 SMITH
        30 ALLEN
        30 BLAKE
        30 JAMES
        30 MARTIN
        30 TURNER
        30 WARD
        40
15 rows selected.
SQL> select d.deptno,e.ename from emp e, dept d
2 where d.deptno = e.deptno
3 union
4 select deptno, null
5 from dept d where not exists (select null from emp e where e.deptno = d.deptno)
6 order by 1,2
7 /
    DEPTNO ENAME
        10 CLARK
        10 KING
        10 MILLER
        20 ADAMS
        20 FORD
        20 JONES
        20 SCOTT
        20 SMITH
        30 ALLEN
        30 BLAKE
        30 JAMES
        30 MARTIN
        30 TURNER
        30 WARD
        40
15 rows selected.In your example something like (NOT tested !)
with i as (select customer_id,count(*) as cnt, sum(TOTAL) as s
from gee_invoice group by customer_id)
select c.CUSTOMER_ID,c.NAME,i.cnt,i.s
from gee_customer c, i
where c.CUSTOMER_ID = i.customer_id
union
select c.CUSTOMER_ID,c.NAME,null,null
from gee_customer c
where not exists (select null from i where c.CUSTOMER_ID = i.customer_id)
Rgds.

Using union operator in discoverer

Hi All,
I have a sql statement which is to be implemented in discoverer:
(select ........where user_entered_date='YYYY/MM/DD' )
UNION
(select ........where user_entered_date='YYYY/MM/DD'
AND (select ........where user_entered_date='YYYY/MM/DD' ))
Problem:
a) There are nested select statements which require parameters to be entered by the user.
b) How would I implement the union operator in the above scenario?
I would really appreciate it if someone could give a work around.
Regards,
Nav

Hi,
Unfortunately, we can not have a SQL query with Union in Discoverer directly.
You should create a view based on the complete query and then create folder using the view.
You can provide a parameter at the report level.
For eg :
View query : select as_of_date from table_name
Report : Add a paremeter for as_of_date
Hope this Helps!
Yogini

UNION operator in ejb 3.0

Hi All,
I have to use UNION operator in my ejb ql. My underlying database is MySQL.
My ejb ql is
SELECT s from eee s where s.name like 'XXX'
UNION
SELECT t from eee t where t.default_id = 'XXX'
union is on the same entitybean.
In my eee entity bean I have tried
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS)
Ejb ql doesnot return the expected results.
Could someone please help me out with UNION operator in ejb 3.0
Thanks

you should have little problems, but just how little is container specific. I successfully run JEE 1.4 stuff on JBoss 5.1 for example without having to make any configuration changes. Heck, I mix that technology with EJB 3 tech, even having shared container managed transactions.
BTW: you mean JEE5, not J2SE 1.5. Big difference in what they represent.

Creating table or View using UNION Operator ???????

Hi all
please need some help ,i have created aquery using UNION operator
(i.e
select A,to_number(null),C from table1
Union
select A,B,To_number(null) from table2)
it gives the output correctly and i need to make this output as View ot table
eacg time i use
Create or replace view v_1 ...........
it gives me this error :: unknown command "UNION" - rest of line ignored.
can any one pls tell me what to do
Thanks

Hi,
I found there is no error in your sql
create view x_v
as
select a from x
union
select to_number(null) from y;
this works fine.
in your sql check your right or left peranthesis
regards
Ripudaman

ROWNUM in UNION operator

All,
I have a requirement in SQL that I have to number each row. Hence I thought of using ROWNUM. But the sql query I'm using uses UNION operator. Hence I used like this
select a,b,rownum as 'field1' from table1
union
select c,d,1 as 'field1' from table2
Will the above query solve my purpose?
thanks
sen

jeneesh wrote:
This will probably kill the purpose of UNION - which is to take only the DISTINCT rows..
If DISTINCT is not intended, it is better to choose UNION ALLYes, you are correct about use of UNION. Probably, OP would have wanted to use Union ALL perhaps, but might have forgotten about suppressing of duplicates and sorting and ended up using Union.
But, in accordance with the original query used by OP, my suggestion of row number would not affect the output, I guess, would it?
Perhaps, if OP would have provided us with some base sample data and the Output desired from it, it would have been of greater help.

Union operator between tables

Hi everyone
I need to merge the data from two omogenous tables (be aware: two tables not two data services; the tables are populated by the user). I specifically need to do this client-side.
When I try to connect the out port of a table to the union operator, the input ports of the operator are grayed out.
I assume the union operator can be used only to merge data from data services: has anyone faced this issue before?
Thanks
Points will be awarded
VT

Hi Vincenzo,
this is where you reach some limitations in the Visual Composer.
The union operator is made to work on data services, not on tables.
The only ways to solve this are either to use another tool (WebDynpro) or to make use of a data service that would perform the necessary operation for you (creating a specific RFC or Web Service).
Rgds,
Karim

All queries in an SQL statement containing a UNION operator must have an equal number of expressions in their target lists.

Cant Add OCRD.CardName,CRD7.ECCNo to this query.Please Help.
declare @FDate as datetime
declare @TDate as datetime
declare @Location as VARCHAR (30)
/* SELECT FROM [dbo].[OLCT] S0 WHERE */ SET @Location = /* S0.Location*/ '[%0]'
/* SELECT FROM [dbo].[OINM] S1 WHERE */ SET @FDate = /* S1.TaxDate*/ '[%1]'
/* SELECT FROM [dbo].[OINM] S2 WHERE */ SET @TDate = /* S2.TaxDate*/ '[%2]'
SELECT
'Sales'Document,OBTN.DistNumber
,NNM1.SeriesName,OINV.DocNum,OCRD.CardName,CRD7.ECCNo,OINV.DocDate,OITM.SWW [HSN Number],INV1.ItemCode,INV1.Dscription,(ITL1.Quantity*-1) [Quantity]
,OEDR.Name,OBTN.U_EDuty*(ITL1.Quantity*-1) EDuty,OBTN.U_EDuty EDutyUnit,OBTN.U_EDCess*(ITL1.Quantity*-1) EDCess,OBTN.U_EDHSCess*(ITL1.Quantity*-1) EDHSCess
,OBTN.U_EDImpDuty SADUnit,OBTN.U_EDImpDuty*(ITL1.Quantity*-1) SADTotal
,OBTN.U_MfgName,OBTN.U_MfgInvNo,OBTN.U_MfgInvDt,OBTN.U_MfgQty,OBTN.U_MfgValue
,OBTN.U_MfgDuty,OBTN.U_MfgCess,OBTN.U_MfgHSCess,OBTN.U_MfgImport
,OBTN.U_SupName,OBTN.U_SupInvNo,OBTN.U_SupInvDt,OBTN.U_SupQty,OBTN.U_SupValue
,OBTN.U_SupDuty,OBTN.U_SupCess,OBTN.U_SupHSCess,OBTN.U_SupImport
FROM
INV1
INNER JOIN
OINV ON INV1.DocEntry=OINV.DocEntry
INNER JOIN
OCRD ON OINV.CardCode = OCRD.CardCode
INNER JOIN
CRD7 ON OCRD.CardCode = CRD7.CardCode
INNER JOIN
OITM ON INV1.ItemCode=OITM.ItemCode
INNER JOIN
OITL ON INV1.BaseType=OITL.ApplyType AND INV1.BaseEntry=OITL.ApplyEntry AND INV1.BaseLine=OITL.ApplyLine
INNER JOIN
ITL1 ON OITL.LogEntry=ITL1.LogEntry
INNER JOIN
OBTN ON ITL1.MdAbsEntry=OBTN.AbsEntry and ITL1.SysNumber=OBTN.SysNumber AND ITL1.ItemCode=OBTN.Itemcode
INNER JOIN
[@OEDR] OEDR ON OBTN.U_EDRate=OEDR.Code
LEFT JOIN
NNM1 ON OINV.Series=NNM1.Series
WHERE INV1.LocCode IN (SELECT Code FROM OLCT WHERE Location=@Location)
AND OINV.DocDate BETWEEN @FDate AND @TDate
UNION ALL
SELECT
'Sales Return'Document,OBTN.DistNumber
,NNM1.SeriesName,ORIN.DocNum,ORIN.DocDate,OITM.SWW [HSN Number],RIN1.ItemCode,RIN1.Dscription,(ITL1.Quantity*-1) [Quantity]
,OEDR.Name,OBTN.U_EDuty*(ITL1.Quantity*-1) EDuty,OBTN.U_EDuty EDutyUnit,OBTN.U_EDCess*(ITL1.Quantity*-1) EDCess,OBTN.U_EDHSCess*(ITL1.Quantity*-1) EDHSCess
,OBTN.U_EDImpDuty SADUnit,OBTN.U_EDImpDuty*(ITL1.Quantity*-1) SADTotal
,OBTN.U_MfgName,OBTN.U_MfgInvNo,OBTN.U_MfgInvDt,OBTN.U_MfgQty,OBTN.U_MfgValue
,OBTN.U_MfgDuty,OBTN.U_MfgCess,OBTN.U_MfgHSCess,OBTN.U_MfgImport
,OBTN.U_SupName,OBTN.U_SupInvNo,OBTN.U_SupInvDt,OBTN.U_SupQty,OBTN.U_SupValue
,OBTN.U_SupDuty,OBTN.U_SupCess,OBTN.U_SupHSCess,OBTN.U_SupImport
FROM
RIN1
INNER JOIN
ORIN ON RIN1.DocEntry=ORIN.DocEntry
INNER JOIN
OITM ON RIN1.ItemCode=OITM.ItemCode
INNER JOIN
OITL ON RIN1.BaseType=OITL.ApplyType AND RIN1.BaseEntry=OITL.ApplyEntry AND RIN1.BaseLine=OITL.ApplyLine
INNER JOIN
ITL1 ON OITL.LogEntry=ITL1.LogEntry
INNER JOIN
OBTN ON ITL1.MdAbsEntry=OBTN.AbsEntry and ITL1.SysNumber=OBTN.SysNumber AND ITL1.ItemCode=OBTN.Itemcode
INNER JOIN
[@OEDR] OEDR ON OBTN.U_EDRate=OEDR.Code
LEFT JOIN
NNM1 ON ORIN.Series=NNM1.Series
WHERE RIN1.LocCode IN (SELECT Code FROM OLCT WHERE Location=@Location)
AND ORIN.DocDate BETWEEN @FDate AND @TDate

Nagarajan,
I've altered the query into this.Think that it is working.Thanks man
declare @FDate as datetime
declare @TDate as datetime
declare @Location as VARCHAR (30)
/* SELECT FROM [dbo].[OLCT] S0 WHERE */ SET @Location = /* S0.Location*/ '[%0]'
/* SELECT FROM [dbo].[OINM] S1 WHERE */ SET @FDate = /* S1.TaxDate*/ '[%1]'
/* SELECT FROM [dbo].[OINM] S2 WHERE */ SET @TDate = /* S2.TaxDate*/ '[%2]'
SELECT
'Sales'Document,OBTN.DistNumber
,NNM1.SeriesName,OINV.DocNum,OCRD.CardName,CRD7.ECCNo,OINV.DocDate,OITM.SWW [HSN Number],INV1.ItemCode,INV1.Dscription,(ITL1.Quantity*-1) [Quantity]
,OEDR.Name,OBTN.U_EDuty*(ITL1.Quantity*-1) EDuty,OBTN.U_EDuty EDutyUnit,OBTN.U_EDCess*(ITL1.Quantity*-1) EDCess,OBTN.U_EDHSCess*(ITL1.Quantity*-1) EDHSCess
,OBTN.U_EDImpDuty SADUnit,OBTN.U_EDImpDuty*(ITL1.Quantity*-1) SADTotal
,OBTN.U_MfgName,OBTN.U_MfgInvNo,OBTN.U_MfgInvDt,OBTN.U_MfgQty,OBTN.U_MfgValue
,OBTN.U_MfgDuty,OBTN.U_MfgCess,OBTN.U_MfgHSCess,OBTN.U_MfgImport
,OBTN.U_SupName,OBTN.U_SupInvNo,OBTN.U_SupInvDt,OBTN.U_SupQty,OBTN.U_SupValue
,OBTN.U_SupDuty,OBTN.U_SupCess,OBTN.U_SupHSCess,OBTN.U_SupImport
FROM
INV1
INNER JOIN
OINV ON INV1.DocEntry=OINV.DocEntry
INNER JOIN
OITM ON INV1.ItemCode=OITM.ItemCode
INNER JOIN
OCRD ON OINV.CardCode = OCRD.CardCode
INNER JOIN
CRD7 ON OCRD.CardCode = CRD7.CardCode
INNER JOIN
OITL ON INV1.BaseType=OITL.ApplyType AND INV1.BaseEntry=OITL.ApplyEntry AND INV1.BaseLine=OITL.ApplyLine
INNER JOIN
ITL1 ON OITL.LogEntry=ITL1.LogEntry
INNER JOIN
OBTN ON ITL1.MdAbsEntry=OBTN.AbsEntry and ITL1.SysNumber=OBTN.SysNumber AND ITL1.ItemCode=OBTN.Itemcode
INNER JOIN
[@OEDR] OEDR ON OBTN.U_EDRate=OEDR.Code
LEFT JOIN
NNM1 ON OINV.Series=NNM1.Series
WHERE INV1.LocCode IN (SELECT Code FROM OLCT WHERE Location=@Location)
AND OINV.DocDate BETWEEN @FDate AND @TDate
UNION ALL
SELECT
'Sales Return'Document,OBTN.DistNumber
,NNM1.SeriesName,ORIN.DocNum,OCRD.CardName,CRD7.ECCNo,ORIN.DocDate,OITM.SWW [HSN Number],RIN1.ItemCode,RIN1.Dscription,(ITL1.Quantity*-1) [Quantity]
,OEDR.Name,OBTN.U_EDuty*(ITL1.Quantity*-1) EDuty,OBTN.U_EDuty EDutyUnit,OBTN.U_EDCess*(ITL1.Quantity*-1) EDCess,OBTN.U_EDHSCess*(ITL1.Quantity*-1) EDHSCess
,OBTN.U_EDImpDuty SADUnit,OBTN.U_EDImpDuty*(ITL1.Quantity*-1) SADTotal
,OBTN.U_MfgName,OBTN.U_MfgInvNo,OBTN.U_MfgInvDt,OBTN.U_MfgQty,OBTN.U_MfgValue
,OBTN.U_MfgDuty,OBTN.U_MfgCess,OBTN.U_MfgHSCess,OBTN.U_MfgImport
,OBTN.U_SupName,OBTN.U_SupInvNo,OBTN.U_SupInvDt,OBTN.U_SupQty,OBTN.U_SupValue
,OBTN.U_SupDuty,OBTN.U_SupCess,OBTN.U_SupHSCess,OBTN.U_SupImport
FROM
RIN1
INNER JOIN
ORIN ON RIN1.DocEntry=ORIN.DocEntry
INNER JOIN
OCRD ON ORIN.CardCode = OCRD.CardCode
INNER JOIN
CRD7 ON OCRD.CardCode = CRD7.CardCode
INNER JOIN
OITM ON RIN1.ItemCode=OITM.ItemCode
INNER JOIN
OITL ON RIN1.BaseType=OITL.ApplyType AND RIN1.BaseEntry=OITL.ApplyEntry AND RIN1.BaseLine=OITL.ApplyLine
INNER JOIN
ITL1 ON OITL.LogEntry=ITL1.LogEntry
INNER JOIN
OBTN ON ITL1.MdAbsEntry=OBTN.AbsEntry and ITL1.SysNumber=OBTN.SysNumber AND ITL1.ItemCode=OBTN.Itemcode
INNER JOIN
[@OEDR] OEDR ON OBTN.U_EDRate=OEDR.Code
LEFT JOIN
NNM1 ON ORIN.Series=NNM1.Series
WHERE RIN1.LocCode IN (SELECT Code FROM OLCT WHERE Location=@Location)
AND ORIN.DocDate BETWEEN @FDate AND @TDate

UNION operator with BULK COLLECT for a collection type

Hi all,
I created a table type as below:
create or replace type coltest is table of number;
Below are 3 PL/SQL blocks that populate data into variables of the above mentioned table type:
BLOCK 1:
DECLARE
col1 coltest := coltest(1, 2, 3, 4, 5, 11);
col2 coltest := coltest(6, 7, 8, 9, 10);
col3 coltest := coltest();
BEGIN
SELECT * BULK COLLECT
INTO col1
FROM (SELECT *
FROM TABLE(CAST(col1 AS coltest))
UNION ALL
SELECT * FROM TABLE(CAST(col2 AS coltest)));
dbms_output.put_line('col1');
dbms_output.put_line('col1.count: ' || col1.COUNT);
FOR i IN 1 .. col1.COUNT
LOOP
dbms_output.put_line(col1(i));
END LOOP;
END;
OUPUT:
col1
col1.count: 5
6
7
8
9
10
BLOCK 2:
DECLARE
col1 coltest := coltest(1, 2, 3, 4, 5, 11);
col2 coltest := coltest(6, 7, 8, 9, 10);
col3 coltest := coltest();
BEGIN
SELECT * BULK COLLECT
INTO col2
FROM (SELECT *
FROM TABLE(CAST(col1 AS coltest))
UNION ALL
SELECT * FROM TABLE(CAST(col2 AS coltest)));
dbms_output.put_line('col2');
dbms_output.put_line('col2.count: ' || col2.COUNT);
FOR i IN 1 .. col2.COUNT
LOOP
dbms_output.put_line(col2(i));
END LOOP;
END;
OUTPUT:
col2
col2.count: 6
1
2
3
4
5
11
BLOCK 3:
DECLARE
col1 coltest := coltest(1, 2, 3, 4, 5, 11);
col2 coltest := coltest(6, 7, 8, 9, 10);
col3 coltest := coltest();
BEGIN
SELECT * BULK COLLECT
INTO col3
FROM (SELECT *
FROM TABLE(CAST(col1 AS coltest))
UNION ALL
SELECT * FROM TABLE(CAST(col2 AS coltest)));
dbms_output.put_line('col3');
dbms_output.put_line('col3.count: ' || col3.COUNT);
FOR i IN 1 .. col3.COUNT
LOOP
dbms_output.put_line(col3(i));
END LOOP;
END;
OUTPUT:
col3
col3.count: 11
1
2
3
4
5
11
6
7
8
9
10
Can anyone please explain the output of BLOCK 1 and 2? Why doesn't bulk collect into col1 and col2 return 11 as count?

Consider the following code from your block.
select *
bulk collect into col1
from (
         select *
           from table(cast(col1 as coltest))
          union
            all
         select *
           from table(cast(col2 as coltest))
       ); Now my assumption would be like this.
PL/SQL engine would recognize the SQL part and will be sending it to SQL Engine for processing. Before doing that it will try to initialize the SQL collection variable COL1. Now when SQL Engine process the SELECT, COL1 would be empty already. And thats the reason you don't get the as 5 and not 11.

Xpath and operator EX

In our scenario we have one inbound interface and two possible outbound interfaces. The only way to decide which outbound interface should be selected is the existence of a node in the inbound message. In the condition editor of the interface determination there is only the operator EX available, meaning node exists. I can use this to select one of the outbound interfaces, but I would need a "NEX" operator to select the other outbound interface in case the node doesn't exist in the inbound message.
Does anyone have a solution to this problem?
Kind regards,
John.

Check the last-but-one example from this wiki:
[http://wiki.sdn.sap.com/wiki/display/XI/XpathConditioninReceiverDetermination|http://wiki.sdn.sap.com/wiki/display/XI/XpathConditioninReceiverDetermination]
Regards,
Abhishek.

Prioritizing a set by using union operator

My requirement is to print data whose log_in_id starts with a and end with y first, then to print data starting with a and b.
select * from userid where log_in_id like 'a%y' union select * from userid where log_in_id like 'a%' or log_in_id like 'b%'

Why go through the table twice? I would do something like:
SQL> SELECT log_in_id
2 FROM (SELECT 'bob' log_in_id FROM dual
3        UNION ALL
4        SELECT 'bill' from dual
5        UNION ALL
6        SELECT 'ally' from dual
7        UNION ALL
8        SELECT 'abby' from dual
9        UNION ALL
10        SELECT 'allen' from dual
11        UNION ALL
12        SELECT 'albert' from dual)
13 ORDER BY CASE WHEN log_in_id LIKE 'a%y' THEN 1 ELSE 2 END,
14           log_in_id;
LOG_IN
abby
ally
albert
allen
bill
bobHTH
John

With using the Union oper. query

Hi Team
I have table like A and B
A table Structure
C1-------C2-------C3
R1-------R2--------R3
R4-------R5---------R6
B table Structure
C1-----C2
R11----R8
my output is like below
C1-------C2-------C3
R1-------R2--------R3
R4-------R5---------R6
R11----R8----------null
i can use the Union all condition i don't want to use the
union all condition who? plz help
select c1,c2,c3
union
select c1,c2;

870003 wrote:
Hi Team
I have table like A and B
A table Structure
C1-------C2-------C3
R1-------R2--------R3
R4-------R5---------R6
B table Structure
C1-----C2
R11----R8
my output is like below
C1-------C2-------C3
R1-------R2--------R3
R4-------R5---------R6
R11----R8----------null
i can use the Union all condition i don't want to use the
union all condition who? plz helpWhy don't you want to use union all, because that is exactly what you are trying to achieve?

Need help on Union operator

Im using oracle8, I want to write a query something like this,
SELECT x,y,z from (subquery)
UNION
SELECT x,y,z from (subquery)
UNION
SELECT x,y,z from (subquery)
But the subquery is that long that I cannot repeat it in every select statement. So i want to define an alias for the subquery, and use it in every select statement. I want to do all this in just SQL, not PL/SQL, since I'll be using this query in cogos. Any sugesstions?

Not that it's any help to you, but Oracle 9i has provided the WITH clause, which allows us to alias sub-queries just like you want to do. It also executes the sub-query just the once, so there are some good performance gains, even for correlated sub-queries.
Cheers, APC

Union Operator

I'm new to oracle and would like to make a view from two tables
BOOK
ÍSBN----TITLE----IN_STOCK----PRICE----AUTHOR_ID----TYPE_ID----SUPPLIER_ID
AUTHOR
ID---NAME---DATE_OF_BIRTH
now i want to make a column which give out the Author Name and the Amount of books the Author has written.
then on the last row i'd like to add the word Total then the total Author(number) and total books(number)
eg
Author_Name Amount_book
Jon 3
dave 1
Sara 1
Total 3 4
How do i do this?

select decode(authors.name,null, 'Total authors : ' || count(authors.name) over (), authors.name) Name, count(books.isbn) total_books
from authors, books
where authors.id = books.author_id
group by rollup(authors.name);
NAME                 TOTAL_BOOKS
Jonathan Lewis                 1
Tom kyte                       2
Total authors : 2              3

Xpath union operator (|)

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