rownum

问题 We just recently moved our DB from 9i to 10G (Yes..better late than never and No - moving to 11g is currently not an option :-)) Details of my Oracle 10G DB are :- Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod PL/SQL Release 10.2.0.1.0 - Production CORE 10.2.0.1.0 Production I am faced with a very weird problem since that move. A query that was and still is working fine with 9i just wont work on 10G. I did search through other SO questions related to rownum but couldnt

问题 select * from MYTABLE t where EQUIPMENT = 'KEYBOARD' and ROWNUM <= 2 or EQUIPMENT = 'MOUSE' and ROWNUM <= 2 or EQUIPMENT = 'MONITOR' and ROWNUM <= 2; I am trying to run a query that returns matches on a field (ie equipment) and limits the output of each type of equipment to 2 records or less per equipment type.. I know this probably not the best way to use multiple where clauses but i have used this in the past separated by or statements but does not work with rownum. It seems it is only

问题 Hoping to find something. I have data as shown below id month flag 111 jan 1 111 feb 1 111 mar 1 111 apr 0 111 may 0 111 jun 1 222 jan 1 222 feb 1 222 mar 0 222 apr 0 222 may 0 222 jun 1 I looking for the output as below id month flag order 111 jan 1 1 111 feb 1 2 111 mar 1 3 111 apr 0 1 111 may 0 2 111 jun 1 1 222 jan 1 1 222 feb 1 2 222 mar 0 1 222 apr 0 2 222 may 0 3 222 jun 1 1 I tried row_number() but the problem is we cannot break the sequence and start over. At an overall level, when

问题 Consider the following query: SELECT * FROM ( SELECT ARRM.*, ROWNUM FROM CRS_ARRANGEMENTS ARRM WHERE CONCAT(ARRM.NBR_ARRANGEMENT, ARRM.TYP_PRODUCT_ARRANGEMENT) > CONCAT('0000000000000000', '0000') ORDER BY ARRM.NBR_ARRANGEMENT, ARRM.TYP_PRODUCT_ARRANGEMENT, ARRM.COD_CURRENCY) WHERE ROWNUM < 1000; This query runs on a table that has 10 000 000 entries. When running the query from Oracle SQL Developer or my application it takes 4 minutes to run ! Unfortunately that is also the behaviour inside

问题 I have a such statement: SELECT MIN(ROWNUM) FROM my_table GROUP BY NAME HAVING COUNT(NAME) > 1); This statement gives me the rownum of the first duplicate, but when transform this statement into DELETE it just delete everything. Why does it happen so? 回答1: This is because ROWNUM is a pseudo column which implies that they do not exist physically. You can better use rowid to delete the records. To remove the duplicates you can try like this: DELETE FROM mytable a WHERE EXISTS( SELECT 1 FROM

问题 I have my PHP application as the "authority" for row limiting, sorting, etc., meaning it outputs this information with the AJAX response and I update jqGrid's settings to match. The problem: I first load the grid omitting limit, page, etc. in order to use the defaults defined in PHP. The AJAX request fires and I get my response. It's returning 27 rows worth of data and a limit for rowNum of "50". Within loadComplete I use grid.setGridParam to update the grid settings and use grid.sortGrid (w/

问题 I'm on Oracle and I need to use both, ORDER BY and ROWNUM , in one request. I need to double-nest my inner query, because I want to apply ORDER BY first and select with ROWNUM=1 afterwards . My data is filtered by O.ID on outmost level. However, I get an error in my inner query, because O.ID is an unknown identifier there. What I want: SELECT O.INSERTDATE OrderCreateDate, -- Determine delivery date (SELECT INSERTDATE FROM ( SELECT OP2.FK_ORDER, DD.ID, DD.INSERTDATE FROM MY_DELIVERYDATE_TABLE

问题 Recently I fixed the some bug: there was rownum in the join condition. Something like this: left join t1 on t1.id=t2.id and rownum<2. So it was supposed to return only one row regardless of the “left join”. When I looked further into this, I realized that I don’t understand how Oracle evaluates rownum in the "left join" condition. Let’s create two sampe tables: master and detail. create table MASTER ( ID NUMBER not null, NAME VARCHAR2(100) ) ; alter table MASTER add constraint PK_MASTER

问题 I have some values as below: MYSTRING -------- Dharshan Ramalingam Devid I can select the specific row value through below query select * from ( select mystring , rownum rn FROM teststring ) where rn = 2; tell the way to delete this second row giving the row no and give me the brief explanation . I have tried as below but its not work.... delete from testring where rownum=2; 回答1: select * from ( select mystring , rownum rn FROM teststring ) where rn = 2; Your query returns rows randomly

问题 I m trying to run this query but it returns zero rows. Any clues why? Select distinct a.id from table1 a, table b where ( a.id= b.id or a.id = b.secondid ) and rownum < 200; But if I run the above query without the ROWNUM clause it finds records: Select distinct a.id from table1 a, table b where ( a.id= b.id or a.id = b.secondid ); I'm confused why the first query is not working. 回答1: Please use the thread below. Pretty good explanations. https://community.oracle.com/thread/210143 Here are