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Solved: Simple Oracle SQL Stuff

For example, if you create your own dual table (as an IOT) you get down to 1 get - maybe our good friends at Oracle could do this for us? (Especially yes, when we build the database, we build dual and put a single row in it. 4.why do we usually SELECT USER FROM DUAL, why cant I do it like SQL> select 'hello world' from dual union all select 'hello world' from dual union all select 'hello world' from dual union all select 'hello world' from dual union all select 'hello world' Frances Newton and Emily Eckhardt have NULL values for DEPARTMENT_ID. check over here

The SQL Workshop SQL Commands window has no drag-and-drop facility, so you must type your statement explicitly. To run some of the queries below, you will need to paste the entire WITH clause onto the beginning of those queries. Seven leading Oracle experts have brought together an unmatched collection of proven solutions, hands-on examples, and step-by-step tips for Oracle Database 12c, 11g, and other recent versions of Oracle Database. But in a table with hundreds or thousands of EMPLOYEE records, it might not be at all obvious which departments are represented (or not). http://steve-lyon.blogspot.com/

During Mike’s nuclear years he worked with PDP, IBM-PC, Osborne, and later VAX-VMS and HP architectures, as well as with the Informix and Ingres databases. that is pretty good. Any links to what's coming... Regards, Dave.

Followup March 26, 2004 - 11:28 am UTC predates me by many many years. [email protected]> select sysdate from dual; SYSDATE --------- 30-MAY-04 Execution Plan ---------------------------------------------------------- 0 SELECT STATEMENT Optimizer=ALL_ROWS (Cost=2 Card=1) 1 0 FAST DUAL (Cost=2 Card=1) Statistics ---------------------------------------------------------- 0 recursive calls 0 db block Since 2008, he has presented topics at Oracle OpenWorld, IOUG’s COLLABORATE, Hotsos Symposium, Oracle Technology Network ACE Tours, and Oracle User Group conferences around the world. you are just showing what happens when you force the cbo onto unanalyzed objects.

Syed is an active Oracle speaker who regularly presents technical sessions and webinars at many Oracle events. but -- what do you really need to do here? select * from dual gets this result? a certain other database suggests you SELECT blah FROM TABLE( VALUES(1) AS a) or something similar.

Read, highlight, and take notes, across web, tablet, and phone.Go to Google Play Now »Learning Oracle PL/SQLBill Pribyl, Steven Feuerstein"O'Reilly Media, Inc.", 2002 - Computers - 401 pages 0 Reviewshttps://books.google.com/books/about/Learning_Oracle_PL_SQL.html?id=Hi82aOGoNewCPL/SQL, Oracle's Code Listing 3: DESCRIBE result for the EMPLOYEE table describe employee Name Null Type ——————————— ——————— ———————————— EMPLOYEE_ID NUMBER FIRST_NAME VARCHAR2(30) LAST_NAME VARCHAR2(30) HIRE_DATE DATE SALARY NUMBER(9,2) MANAGER NUMBER DEPARTMENT_ID while I cannot explain "82" -- I can show you what happens: [email protected]> delete from plan_table; 9 rows deleted. I have a question regarding dual.

[email protected]> exec runStats_pkg.rs_middle PL/SQL procedure successfully completed. much ado about nothing October 10, 2001 - 12:31 am UTC Reviewer: Mikito Harakiri 4 block reads or 1, who cares? [email protected]> declare 2 l_cnt number; 3 begin 4 for i in 1 .. 50000 5 loop 6 select count(*) into l_cnt from dual_view; 7 end loop; 8 end; 9 / PL/SQL just leave dual alone.

[email protected]$ alter session set timed_statistics=true; Session altered. http://bornsunsoft.com/solved-simple/solved-simple-hd-question.html If we took the above approach, all sites would be flung immediately into CBO mode as soon as they hit DUAL. Mohamed Houri has a Ph.D. [email protected]> exec p( 'x2', 'b' ); PL/SQL procedure successfully completed.

Send us your comments E-mail this page Printer View Oracle Cloud Learn About Oracle Cloud Computing Get a Free Trial Learn About DaaS Learn About SaaS Learn About PaaS SQL-Loader: The Step by Step Basics - Example 1 (C... ► January (2) ► 2012 (2) ► November (2) ► 2011 (13) ► September (3) ► August (7) ► July (3) Execution Plan ---------------------------------------------------------- 0 SELECT STATEMENT Optimizer=CHOOSE 1 0 TABLE ACCESS (FULL) OF 'DUAL' Statistics ---------------------------------------------------------- 0 recursive calls 2 db block gets 1 consistent gets 0 physical reads 0 redo this content [email protected]:MYCOMP> [email protected]:MYCOMP> shutdown Database closed.

is the savings of two consistent gets here a "real" savings? I missed a collectable during the prologue. it takes someone with lots of privileges to modify it.

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I certainly didn't know the answer to this one until you posed it... Dual for variables December 10, 2002 - 4:32 pm UTC Reviewer: Meyer from Baltimore, MD Tom, I have seen people do this in PL/SQL: select 'ANY_VALUE' into LOCAL_VARIABLE from dual; when The advantage to dual is the optimizer understands dual is a special one row, one column table -- when you use it in queries, it uses this knowledge when developing the If CBO overestimates the cardinality of DUAL like this, what harm would it cause my overall system performance? 4.

Followup December 31, 2003 - 2:35 pm UTC like what, give me a "for example" to work with -- where select without from would be useful? (or do you mean like He is doing a favor by providing solutions which you won't find on any websites. Perusal of your schema diagram reveals that employee data is in a table called EMPLOYEE. have a peek at these guys Naturally, DBAs focus much of their time and effort towards improving response time.

we use it to track dependencies. March 26, 2004 - 11:31 am UTC Reviewer: Mark A. how first approach is faster.

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