Preparing query through Inline View

Pls. help to prepare a query by i may extract the following data through inline view (i.e; other than using UNION):
1. SALESMAN who are working in deptno # 30
2. MANAGER who are working in deptno # 20
In department # 30 both SALESMAN and MANAGER are working likewise in department # 20 both SALESMAN and MANAGER are working.
I want to fetch only MANAGER from department # 20 and only SALESMAN from department 30.
I can fetch the above sought data through "UNION" but i know whether the above data can be fetched other than "UNION" like using INLINE VIEW.
INSERT INTO EMP
VALUES
(7369,'SMITH','CLERK',7902,'WEDNESDAY, DECEMBER 17, 1980',800,NULL,20)
INSERT INTO EMP
VALUES
(7499,'ALLEN','SALESMAN',7698,'FRIDAY, FEBRUARY 20, 1981',1600,300,30)
INSERT INTO EMP
VALUES
(7521,'WARD','SALESMAN',7698,'SUNDAY, FEBRUARY 22, 1981',1250,500,30)
INSERT INTO EMP
VALUES
(7566,'JONES','MANAGER',7839,'THURSDAY, APRIL 02, 1981',2975,NULL,20)
INSERT INTO EMP
VALUES
(7654,'MARTIN','SALESMAN',7698,'MONDAY, SEPTEMBER 28, 1981',1250,1400,30)
INSERT INTO EMP
VALUES
(7698,'BLAKE','MANAGER',7839,'FRIDAY, MAY 01, 1981',2850,NULL,30)
INSERT INTO EMP
VALUES
(7782,'CLARK','MANAGER',7839,'TUESDAY, JUNE 09, 1981',2450,NULL,10)
INSERT INTO EMP
VALUES
(7788,'SCOTT','ANALYST',7566,'SUNDAY, APRIL 19, 1987',3000,NULL,20)
INSERT INTO EMP
VALUES
(7839,'KING','PRESIDENT',NULL,'TUESDAY, NOVEMBER 17, 1981',5000,NULL,10)
INSERT INTO EMP
VALUES
(7844,'TURNER','SALESMAN',7698,'TUESDAY, SEPTEMBER 08, 1981',1500,0,30)
INSERT INTO EMP
VALUES
(7876,'ADAMS','CLERK',7788,'SATURDAY, MAY 23, 1987',1100,NULL,20)
INSERT INTO EMP
VALUES
(7900,'JAMES','CLERK',7698,'THURSDAY, DECEMBER 03, 1981',950,NULL,30)
INSERT INTO EMP
VALUES
(7902,'FORD','ANALYST',7566,'THURSDAY, DECEMBER 03, 1981',3000,NULL,20)
INSERT INTO EMP
VALUES
(7934,'MILLER','CLERK',7782,'SATURDAY, JANUARY 23, 1982',1300,NULL,10)
INSERT INTO EMP
VALUES
(100,'SALAM','SALESMAN',7698,'FRIDAY, FEBRUARY 20, 1981',1600,300,20)
INSERT INTO EMP
VALUES
(101,'KARIN','SALESMAN',7698,'SATURDAY, FEBRUARY 21, 1981',1250,500,20)
INSERT INTO EMP
VALUES
(102,'RAFIQ','SALESMAN',7698,'SATURDAY, FEBRUARY 20, 1988',1250,1400,20)
INSERT INTO EMP
VALUES
(103,'JABBAR','SALESMAN',7698,'WEDNESDAY, FEBRUARY 20, 1980',1500,0,20)
INSERT INTO EMP
VALUES
(500,'RAHIM','MANAGER',7839,'THURSDAY, DECEMBER 16, 1971',2975,NULL,20)
/thanks.
Sharif
Edited by: user13094274 on May 8, 2010 6:49 AM

CREATE TABLE emp
    (empno                          NUMBER(4,0) NOT NULL,
    ename                          VARCHAR2(10),
    job                            VARCHAR2(9),
    mgr                            NUMBER(4,0),
    hiredate                       DATE,
    sal                            NUMBER(7,2),
    comm                           NUMBER(7,2),
    deptno                         NUMBER(2,0))

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Need help with SQL Query with Inline View + Group by

Hello Gurus,
I would really appreciate your time and effort regarding this query. I have the following data set.
Reference_No---Check_Number---Check_Date--------Description-------------------------------Invoice_Number----------Invoice_Type---Paid_Amount-----Vendor_Number
1234567----------11223-------------- 7/5/2008----------paid for cleaning----------------------44345563------------------I-----------------*20.00*-------------19
1234567----------11223--------------7/5/2008-----------Adjustment for bad quality---------44345563------------------A-----------------10.00------------19
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4653456----------11223--------------7/5/2008-----------paid for cleaning------------------------35654765--------------------I---------------------30.00-------------19
Please Ignore '----', added it for clarity
I am trying to write a query to aggregate paid_amount based on Reference_No, Check_Number, Payment_Date, Invoice_Number, Invoice_Type, Vendor_Number and display description with Invoice_type 'I' when there are multiple records with the same Reference_No, Check_Number, Payment_Date, Invoice_Number, Invoice_Type, Vendor_Number. When there are no multiple records I want to display the respective Description.
The query should return the following data set
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1234567----------11223-------------- 7/5/2008----------paid for cleaning----------------------44345563------------------I-----------------*10.00*------------19
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The following is my query. I am kind of lost.
select B.Description, A.sequence_id,A.check_date, A.check_number, A.invoice_number, A.amount, A.vendor_number
from (
select sequence_id,check_date, check_number, invoice_number, sum(paid_amount) amount, vendor_number
from INVOICE
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It looks like it is a duplicate thread - correct me if i'm wrong in this case ->
Need help with SQL Query with Inline View + Group by
Regards.
Satyaki De.

Tuning query with inline views

Hi!
I have a performance problem with the following query. I try to combine v1 and v2 into one inline view but because of the recursive design of the tables workflow and workflow_node it didn't work.
Does anybody has an idea for tuning this query?
SELECT distinct v1.u_protocol_id
   FROM ( SELECT workflow_node.workflow_id,u_protocol.u_protocol_id
               FROM workflow_node,workflow,U_protocol
               WHERE workflow.workflow_id=workflow_node.workflow_id
                 AND u_protocol.u_protocol_id = workflow_node.parameter_2
              AND workflow_node.workflow_node_type_id=17
              AND workflow.workflow_node_type_id=42
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         ) v3
   WHERE v1.workflow_id = v2.workflow_id
     AND v2.test_template_id= v3.test_template_id

I have found a script (utlxplan.sql) for creating the plan_table so here it is
SQL> @c:\utlxplan.sql;
Table created.
SQL> EXPLAIN PLAN FOR SELECT distinct v1.u_protocol_id
2     FROM ( SELECT workflow_node.workflow_id,u_protocol.u_protocol_id
3         FROM lims_sys.workflow_node,lims_sys.workflow,lims_sys.U_protocol
4         WHERE workflow.workflow_id=workflow_node.workflow_id
5           AND u_protocol.u_protocol_id = workflow_node.parameter_2
6        AND workflow_node.workflow_node_type_id=17
7        AND workflow.workflow_node_type_id=42
8       ) v1,
9       ( SELECT workflow_node.workflow_id,test_template.test_template_id
10         FROM lims_sys.aliquot,lims_sys.test,lims_sys.workflow_node,lims_sys.test_template
11         WHERE aliquot.aliquot_id = test.aliquot_id
12           AND test.test_template_id = test_template.test_template_id
13     AND test_template.test_template_id = workflow_node.template
14       ) v2
15     WHERE v1.workflow_id = v2.workflow_id
16 /
Explained.
SQL> SELECT * FROM TABLE(dbms_xplan.display);
PLAN_TABLE_OUTPUT
| Id | Operation                           | Name                           |
Rows | Bytes | Cost |
|   0 | SELECT STATEMENT                    |                                 |
PLAN_TABLE_OUTPUT
      |       |       |
|   1 | SORT UNIQUE                        |                                 |
      |       |       |
|   2 |   FILTER                            |                                 |
      |       |       |
|   3 |    NESTED LOOPS                     |                                 |
      |       |       |
PLAN_TABLE_OUTPUT
|   4 |     NESTED LOOPS                    |                                 |
      |       |       |
|   5 |      NESTED LOOPS                   |                                 |
      |       |       |
|   6 |       NESTED LOOPS                  |                                 |
      |       |       |
|   7 |        NESTED LOOPS                 |                                 |
      |       |       |
PLAN_TABLE_OUTPUT
|   8 |         NESTED LOOPS                |                                 |
      |       |       |
|   9 |          TABLE ACCESS BY INDEX ROWID| WORKFLOW                        |
      |       |       |
|* 10 |           INDEX RANGE SCAN          | FK_WORKFLOW_WORKFLOW_NODE_TYPE |
      |       |       |
| 11 |          TABLE ACCESS BY INDEX ROWID| WORKFLOW_NODE                   |
PLAN_TABLE_OUTPUT
      |       |       |
| 12 |           AND-EQUAL                 |                                 |
      |       |       |
|* 13 |            INDEX RANGE SCAN         | FK_WORKFLOW_NODE_WORKFLOW       |
      |       |       |
|* 14 |            INDEX RANGE SCAN         | FK_WORKFLOW_NODE_NODE_TYPE      |
      |       |       |
PLAN_TABLE_OUTPUT
| 15 |         TABLE ACCESS BY INDEX ROWID | U_PROTOCOL                      |
      |       |       |
|* 16 |          INDEX UNIQUE SCAN          | PK_U_PROTOCOL                   |
      |       |       |
| 17 |        TABLE ACCESS BY INDEX ROWID | WORKFLOW_NODE                   |
      |       |       |
|* 18 |         INDEX RANGE SCAN            | FK_WORKFLOW_NODE_WORKFLOW       |
      |       |       |
PLAN_TABLE_OUTPUT
| 19 |       TABLE ACCESS BY INDEX ROWID   | TEST_TEMPLATE                   |
      |       |       |
|* 20 |        INDEX UNIQUE SCAN            | PK_TEST_TEMPLATE                |
      |       |       |
| 21 |      TABLE ACCESS BY INDEX ROWID    | TEST                            |
      |       |       |
|* 22 |       INDEX RANGE SCAN              | FK_TEST_TEST_TEMPLATE           |
PLAN_TABLE_OUTPUT
      |       |       |
| 23 |     TABLE ACCESS BY INDEX ROWID     | ALIQUOT                         |
      |       |       |
|* 24 |      INDEX UNIQUE SCAN              | PK_ALIQUOT                      |
      |       |       |
| 25 |    INDEX UNIQUE SCAN                | PK_OPERATOR_GROUP               |
      |       |       |
PLAN_TABLE_OUTPUT
| 26 |    INDEX UNIQUE SCAN                | PK_OPERATOR_GROUP               |
      |       |       |
| 27 |    INDEX UNIQUE SCAN                | PK_OPERATOR_GROUP               |
      |       |       |
| 28 |    INDEX UNIQUE SCAN                | PK_OPERATOR_GROUP               |
      |       |       |
| 29 |    INDEX UNIQUE SCAN                | PK_OPERATOR_GROUP               |
      |       |       |
PLAN_TABLE_OUTPUT
Predicate Information (identified by operation id):
10 - access("SYS_ALIAS_5"."WORKFLOW_NODE_TYPE_ID"=42)
13 - access("SYS_ALIAS_5"."WORKFLOW_ID"="WORKFLOW_NODE"."WORKFLOW_ID")
14 - access("WORKFLOW_NODE"."WORKFLOW_NODE_TYPE_ID"=17)
PLAN_TABLE_OUTPUT
16 - access("SYS_ALIAS_4"."U_PROTOCOL_ID"=TO_NUMBER("WORKFLOW_NODE"."PARAMETER
_2"))
18 - access("WORKFLOW_NODE"."WORKFLOW_ID"="WORKFLOW_NODE"."WORKFLOW_ID")
20 - access("SYS_ALIAS_1"."TEST_TEMPLATE_ID"="WORKFLOW_NODE"."TEMPLATE")
22 - access("SYS_ALIAS_2"."TEST_TEMPLATE_ID"="SYS_ALIAS_1"."TEST_TEMPLATE_ID")
24 - access("SYS_ALIAS_3"."ALIQUOT_ID"="SYS_ALIAS_2"."ALIQUOT_ID")
Note: rule based optimization

Query works everywhere but Flex: inline views not supported perhaps?

EDIT2: Actually not. It turns out to be a bug in the way Adobe is treating any integer PK column, no matter how it is defined, INT, or INTEGER, as an alias for the rowid in SQlite. This is incorrect. rowid does not always equal the PK value. This causes joins to return the wrong values.
EDIT: turns out to be the use of the absolute value function in the query.
See http://forums.adobe.com/thread/516392
My bread-and-butter query, the one that is the core of my application, uses a UNION query with inline views when doing proximity word-searches. It works beautifully in SQLite returning a resultset in about one second from an over 300MB database, against several tables equijoined, the two biggest tables having close to 4 million rows and 300,000 rows, respectively.
It runs fine in Visual Studio using the .NET provider for SQLite, and also in SQLite Manager 0.5.6 by Mrinal Kant and in other front-ends to SQLite. But the verbatim query returns no rows in Flex and zero rows in the SQLite Admin GUI front-end, which is built on the Flex SQL libraries.
My first thought is that inline views might not be supported in Flex?
Does Flex do what in the Microsoft world is called a "pass-through" query, sending the sql intact through to the back end, or does Flex take the query statement apart and apply the WHERE clause conditions client-side, as Microsoft Access does to support so-called "heterogeneous" joins, i.e. queries that might join tables from, say, SQL Server and Oracle in the same query?

EDIT2: Actually not. It turns out to be a bug in the way Adobe is treating any integer PK column, no matter how it is defined, INT, or INTEGER, as an alias for the rowid in SQlite. This is incorrect. rowid does not always equal the PK value. This causes joins to return the wrong values.
EDIT: turns out to be the use of the absolute value function in the query.
See http://forums.adobe.com/thread/516392
My bread-and-butter query, the one that is the core of my application, uses a UNION query with inline views when doing proximity word-searches. It works beautifully in SQLite returning a resultset in about one second from an over 300MB database, against several tables equijoined, the two biggest tables having close to 4 million rows and 300,000 rows, respectively.
It runs fine in Visual Studio using the .NET provider for SQLite, and also in SQLite Manager 0.5.6 by Mrinal Kant and in other front-ends to SQLite. But the verbatim query returns no rows in Flex and zero rows in the SQLite Admin GUI front-end, which is built on the Flex SQL libraries.
My first thought is that inline views might not be supported in Flex?
Does Flex do what in the Microsoft world is called a "pass-through" query, sending the sql intact through to the back end, or does Flex take the query statement apart and apply the WHERE clause conditions client-side, as Microsoft Access does to support so-called "heterogeneous" joins, i.e. queries that might join tables from, say, SQL Server and Oracle in the same query?

Inline views / view merge slowing the query

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I tried /*+ NO_MERGE(D1,D2,D3,D4)*/ but to no help.
TIA.
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And the Oracle version number, to three decimal places is?
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Difference between INLINE view and WITH clause

Can anyone plz explain me about the performance difference between the below queries?
Query using INLINE view:
SELECT e.ename AS employee_name,
dc.dept_count AS emp_dept_count
FROM emp e,
(SELECT deptno, COUNT(*) AS dept_count
FROM emp
GROUP BY deptno) dc
WHERE e.deptno = dc.deptno;
Query using WITH clause:
WITH dept_count AS (
SELECT deptno, COUNT(*) AS dept_count
FROM emp
GROUP BY deptno)
SELECT e.ename AS employee_name,
dc.dept_count AS emp_dept_count
FROM emp e,
dept_count dc
WHERE e.deptno = dc.deptno;

Here's another one:
http://www.oracle-base.com/articles/misc/WithClause.php
And, here on this forum you will see that the WITH-clause is heavily used by all of us in order to generate some sample data (when OP's don't care to post CREATE TABLE + INSERT INTO statements).
The WITH clause enables you as well to 'pretend' you have a table and demonstrate a solution very quickly, without doing actual DDL .
As for the performance difference:
We would need to know your database version and many other things.
See:
HOW TO: Post a SQL statement tuning request - template posting
for step by step instructions you can (and should) explore yourself.

Passing a value to Inline View WHERE clause through JDev...

Hi ,
I need to pass a value to inline view which is mentioned in below VIEW query.
That view is created inside a view using jDev. Note that there are two WHERE clauses one in the Main query and the other in the Inline view.
How to set the value for the innerView.
//copied the code from Java
view.volAlertsHistroyView.setWhereClauseParam(1, new Integer(clientId));
Gives an error Missing IN or OUT parameter at index:: 1
SELECT Alerts.SEND_TIME,
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Please get back to me .
Regards
Mohan
[email protected]

What happens when you change your Java code to:
view.volAlertsHistroyView.setWhereClauseParam(0, new Integer(clientId));
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Sascha

Can You Explain This SQL Query - Inline View Included

The query is taken from "Oracle Database 10g: SQL Fundamentals II" page 3-7 (chapter 3)
I do not fully understand the following query:
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Thanks

user11164565 wrote:
The query is taken from "Oracle Database 10g: SQL Fundamentals II" page 3-7 (chapter 3)
I do not fully understand the following query:
SELECT a.last_name, a.salary, a.department_id, b.salavg
FROM   employees a, (SELECT   department_id,
AVG(salary) salavg
FROM     employees
GROUP BY department_id) b
WHERE a.department_id = b.department_id
AND    a.salary > b.salavg;
The inline view can return several records. Can you please tell me in step by step how does this work. I understand the concept of join tables and aliases, etc. I just need to know the mechanism of this code.
The query is returning the last name, salary , department and average salary of all the departments where salary is greater than the average salary.
HTH
Aman....

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I have a unique situation where I have to limit the number of rows based on group. so I created an Inline view and applied a limit on it.
ex:
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but this design was rejected, because it seems to have a great impact on performance due to inline view.
Also I cant set a rowlimit directly on the query because GROUP BY clause is used in the select.
When the rownum is directly applied in the WHERE, first it limits the rows and then it makes a GROUP, so when user asks to retrieve 10 records, it may show less than 10 rows because of the grouping.
please help to find a alternative solution which helps to get the expected result set and same time without loosing performance.

Hi,
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Regards
Laurent

Improve Performance on Inline view Query

All,
I have a unique situation where I have to limit the number of rows based on group. so I created an Inline view and applied a limit on it.
ex:
SELECT col_A, col_B FROM ( SELECT col_a, count(*) FROM tab_a WHERE col_a = 'XXX' GROUP BY col_a) ROWNUM <-10.
but this design was rejected, because it seems to have a great impact on performance due to inline view.
Also I cant set a rowlimit directly on the query because GROUP BY clause is used in the select.
When the rownum is directly applied in the WHERE, first it limits the rows and then it makes a GROUP, so when user asks to retrieve 10 records, it may show less than 10 rows because of the grouping.
please help to find a alternative solution which helps to get the expected result set and same time without loosing performance

but this design was rejected, because it seems to have a great impact on performance due to inline view.What proof was offered that this query performed badly. There is nothing inherently non-performant about in-line views. I would demand to see some evidence that this query uses an unreasonable amount of system resource.
However, you could try this:
SELECT t.col1, avg(t.col2)
FROM   t1 t
WHERE t.col1 IN ( SELECT DISTINCT x.col1
                   FROM   t1 x
                   WHERE col3 = 'XXX'
                   AND    rownum <=10 )
GROUP BY t.col1
/I assume your example is not derived from your real code (otherwise the WHERE clause would restrict the inline query to one returned row - problem solved!)
Cheers, APC

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On digging through the log, I discovered the test Query fails to prefix the alias before the attribute. So what I get is something similar to this
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Is there a way to ensure that the custId can be changed to o.custId???
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Thanks,
Manoj

Hi experts...
Any pointers to this issue???
Please help!
Regards,
Debolina

Query SharePoint List View

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list.GetItems(query, view.ID.ToString("B").ToUpper());
properties of the view that is specified by the viewName parameter override the properties that are specified in the query object that is passed through the query parameter. For example, if the query
object includes a tag that specifies only items containing a particular column value, while the view specifies to return all items, this method retrieves all of the items
So is there any way to query a sharepoint list view (not All Items) using CAML query?
I this retrieving view in a data table and query it later, which is an option but might give a performance degradation.
Regards, Aj (http://www.aj-sharepoint.blogspot.com/) MCTS

Hello,
Did you try with SPView.Query method? If not then this can be query to specific view.
http://msdn.microsoft.com/en-us/library/microsoft.sharepoint.spview.query.aspx
Hemendra:Yesterday is just a memory,Tomorrow we may never see
Please remember to mark the replies as answers if they help and unmark them if they provide no help

How can i see the values of a prepared query

Somebody knows about a tool that show me the values of a prepared query.
I tried with the view V$SQL and with the TKPROF, but both show me the same query text and i need to know the parameter's values. Example of a prepared query - I don't know if it is the correct name of that kind of query.
UPDATE "CL0E01" SET "BLOQUEO"=:1
WHERE
"CLAVE"=:2 AND "NUM_REGS"=:3 AND "ULT_CLV"=:4 AND "BLOQUEO"=:5
Is it a tool that show me the value??
Thanks for the help.
Roberto Moreno

I tried with the view V$SQL_BIND_CAPTURE but i get this error. "ORA-00932: inconsistent datatypes: expected CHAR got -". I executed in the Application Express.
What could be wrong??
I put my STATISTICS_LEVEL to ALL but nothing happen. I recieved the same result.
I executed the view V$STATISTICS_LEVEL, for the Bind Data Capture I have enabled the session and system status, the activation level is TYPICAL.
Thanks for your help TongucY

Does an inline view execute before the rest of the select?

Hi,
The O'Reilly book Mastering Oracle Sql defines an inline view simply as a
subquery in a select FROM clause. This conforms to the definitions in
the Oracle 9i and 10g docs.
But unlike the Oracle docs, the O'Reilly book says the inline view is,
like a WITH clause, executed before the rest of the query. I can't see
how this can be done unless the inline view makes no reference to
other tables joined in the FROM clause.
Is there a species of inline view in 9i/10g that IS restricted as above -
no refs to other tables in the FROM clause - and what is it called?
Thanks for any help.
Ken Quirici

As explained above, Oracle can choose to merge the query if feasible to do so. Look at the two queries and their plans below. The plan in second query changes to creating a temporary VIEW since in that case, Oracle is unable to perform the merge:
SQL> select *
2          from scott.emp e,
3                  (select * from scott.dept d where d.deptno = 10) dd
4 where
5          e.deptno = dd.deptno
6 /
     EMPNO ENAME      JOB              MGR HIREDATE           SAL       COMM     DEPTNO     DEPTNO DNAME          LOC
      7782 CLARK      MANAGER         7839 09-JUN-1981       2450                    10         10 ACCOUNTING     NEW YORK
      7839 KING       PRESIDENT            17-NOV-1981       5000                    10         10 ACCOUNTING     NEW YORK
      7934 MILLER     CLERK           7782 23-JAN-1982       1300                    10         10 ACCOUNTING     NEW YORK
3 rows selected.
Execution Plan
Plan hash value: 3570059291
| Id | Operation                    | Name           | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT             |                |     3 |   171 |     2   (0)| 00:00:01 |
|   1 | NESTED LOOPS                |                |     3 |   171 |     2   (0)| 00:00:01 |
|   2 |   TABLE ACCESS BY INDEX ROWID| DEPT           |     1 |    20 |     1   (0)| 00:00:01 |
|* 3 |    INDEX UNIQUE SCAN         | PK_DEPT        |     1 |       |     0   (0)| 00:00:01 |
|   4 |   TABLE ACCESS BY INDEX ROWID| EMP            |     3 |   111 |     1   (0)| 00:00:01 |
|* 5 |    INDEX RANGE SCAN          | IDX_EMP_DEPTNO |     3 |       |     0   (0)| 00:00:01 |
SQL> select *
2          from scott.emp e,
3                  (select * from scott.dept d where d.deptno = 10 and rownum > 0) dd
4 where
5          e.deptno = dd.deptno
6 /
     EMPNO ENAME      JOB              MGR HIREDATE           SAL       COMM     DEPTNO     DEPTNO DNAME          LOC
      7782 CLARK      MANAGER         7839 09-JUN-1981       2450                    10         10 ACCOUNTING     NEW YORK
      7839 KING       PRESIDENT            17-NOV-1981       5000                    10         10 ACCOUNTING     NEW YORK
      7934 MILLER     CLERK           7782 23-JAN-1982       1300                    10         10 ACCOUNTING     NEW YORK
3 rows selected.
Execution Plan
Plan hash value: 1670713873
| Id | Operation                       | Name           | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT                |                |     5 |   280 |     2   (0)| 00:00:01 |
|   1 | NESTED LOOPS                   |                |     5 |   280 |     2   (0)| 00:00:01 |
|   2 |   VIEW                          |                |     1 |    19 |     1   (0)| 00:00:01 |
|   3 |    COUNT                        |                |       |       |            |          |
|* 4 |     FILTER                      |                |       |       |            |          |
|   5 |      TABLE ACCESS BY INDEX ROWID| DEPT           |     1 |    20 |     1   (0)| 00:00:01 |
|* 6 |       INDEX UNIQUE SCAN         | PK_DEPT        |     1 |       |     0   (0)| 00:00:01 |
|   7 |   TABLE ACCESS BY INDEX ROWID   | EMP            |     5 |   185 |     1   (0)| 00:00:01 |
|* 8 |    INDEX RANGE SCAN             | IDX_EMP_DEPTNO |     5 |       |     0   (0)| 00:00:01 |
SQL> disconnect
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL>
can it, in it's WHERE clause, reference other tables in the FROM clause?No. it cannot. but as said above, tha may not stop Oracle from merging the queries.
SQL> select *
2          from scott.emp e,
3                  (select * from scott.dept d where d.deptno = 10 and e.sal > 1000) dd
4 where
5          e.deptno = dd.deptno
6 /
                (select * from scott.dept d where d.deptno = 10 and e.sal > 1000) dd
ERROR at line 3:
ORA-00904: "E"."SAL": invalid identifier
SQL>

Preparing query through Inline View

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