I have a question regarding the SQL joins - Whenever we join two different tables on some fields, what will happen exactly inside oracle which will result in the query output? Does Oracle create/use a temporary table just for presenting the query output? ...
I'm subcontractor and my client wants to upgrade Oracle database from 9 to 10. Other vendor is going to perform the upgrade process, and I was asked to create whatever backup I need before the upgrade, and then recreate the environment in Oracle 10. All my data is stored in a separate database in a single schema. No fancy relations, scri...
In a SELECT statement I want to convert values to strings ie. SELECT TO_STRING(value). How can I do this in Oracle SQL? ...
I've got a scenario where I want to switch on two different tables in an outer join. It goes something like this:- select mytable.id, yourtable.id from mytable left outer join (case when mytable.id = 2 then table2 yourtable on table1.id = table2.id ...
Hello, Is it possible to set the Oracle connection cache to restart cached connections after a period of time? ...
is there any predefined function or method available to get second highest salary from an employee table ...
Hi all, I have a table in an Oracle Database that has, among others, a DATE column that is loaded with the insertion timestamp of each row. I need to use existing data in such table to analyze the correlation between some events, so that with data like this: COL_1 COL_2 TS A 1 Mon 15, February 20...
Trying to Interop a functionality from the Outside In API from Oracle. Have the following function: SCCERR EXOpenExport {VTHDOC hDoc, VTDWORD dwOutputId, VTDWORD dwSpecType, VTLPVOID pSpec, VTDWORD dwFlags, VTSYSPARAM dwReserved, VTLPVOID pCallbackFunc, VTSYSPARAM dwCallbackData, VTLPHEXPORT phExport); From the header files I redu...
In Oracle (10g), when I use a View (not Materialized View), does Oracle take into account the where clause when it executes the view? Let's say I have: MY_VIEW = SELECT * FROM PERSON P, ORDERS O WHERE P.P_ID = O.P_ID And I then execute the following: SELECT * FROM MY_VIEW WHERE MY_VIEW.P_ID = '1234' When this executes, does ora...
How am I suppose to assign users a group? It seems that under this: dn: cn=<role_name>,cn=groups,<realm> objectclass: top objectclass: groupOfUniqueNames objectclass: orclGroup displayname: Role description: Role for this user uniquemember: <full DN> cn: <role_name> According to this example, when I add a group, I can specifiy...
Hello, I have an empty table that previously had a large amount of rows. The table has about 10 columns and indexes on many of them, as well as indexes on multiple columns. DELETE FROM item WHERE 1=1 This takes approximately 40 seconds to complete SELECT * FROM item this takes 4 seconds. The execution plan of SELECT * FROM ITEM ...
When I try to create a unique index on a large table, I get a unique contraint error. The unique index in this case is a composite key of 4 columns. Is there an efficient way to identify the duplicates other than : select col1, col2, col3, col4, count(*) from Table1 group by col1, col2, col3, col4 having count(*) > 1 The explain pla...
The following query takes more than 3 minutes to run because tables contain massive amounts of data: SELECT RTRIM(LTRIM(A.HEAD)), A.EFFECTIVE_DATE, FROM TABLE_1 A WHERE A.TYPE_OF_ACTION='6' AND A.EFFECTIVE_DATE >= ADD_MONTHS(SYSDATE,-15) MINUS SELECT RTRIM(LTRIM(B.head)), B.EFFECTIVE_DATE, ...
Hi I'm trying to output something like the following but am finding that there is a lot of code duplication going on. | australian_has_itch | kiwi_has_itch | | yes | no | | no | n/a | | n/a | no | ... My query looks like this with two case statements tha...
Hi, i have an big problem with an SQL Statement in Oracle. I want to select The TOP 10 Records ordered by STORAGE_DB wich arent in a list from an other select statement. This one works fine for all records: SELECT DISTINCT APP_ID, NAME, STORAGE_GB, HISTORY_CREATED, TO_CHAR(HISTORY_DATE, 'DD.MM.YYYY') AS HISTORY_DATE ...
Hi, I need to do migration date->timestamp with timezone similar to described here: http://stackoverflow.com/questions/1664627/migrating-oracle-date-columns-to-timestamp-with-timezone. But I need to make additional convertion (needed to work correctly with legacy apps): for all dates we need to change timezone to UTC and set time to 12:...
SQL Server is able to return the results of multiple queries in a single round-trip, e.g: select a, b, c from y; select d, e, f from z; Oracle doesn't like this syntax. It is possible to use reference cursors, like this: begin open :1 for select count(*) from a; open :2 for select count(*) from b; end; However, you incur a ...
Hi, I am writing some new SQL queries and want to check the query plans that the Oracle query optimiser would come up with in production. My development database doesn't have anything like the data volumes of the production database. How can I export database statistics from a production database and re-import them into a development...
Hi guys, I'm currently using SubSonic 2.2 to code against an Oracle XE DB, which carries certain tables that have a primary key which gets automatically filled by means of a sequence and corresponding trigger. In SQL Server this isn't a problem, since SubSonic automatically fills in the autoincrement key value into the correct property...
How can I connect to an Oracle database and SQL Server 2005-2008 database with Objective-C? ...