oracle11g

问题 When i run the following query: Select tm.product_id, listagg(tm.book_id || '(' || tm.score || ')',',') within group (order by tm.product_id) as matches from tl_product_match tm where tm.book_id is not null group by tm.product_id Oracle returns the following error: ORA-01489: result of string concatenation is too long I know that the reason it is failing is that the listagg function is trying to concatenate a the values which are greater than 4000 characters which is not supported. I have

问题 I am facing a weird problem. What I am doing is I am storing some values in DB(oracle 11g) as varchar2 and fetching the values in java and working with the fetched data. Now I have \n as a value in DB and getting it in java using rs.getString() . I am getting proper value \n . String newLine=rs.getString("column_value"); Now i parse a HTML page and get the whole page as a string.Suppose the page has 3 lines each depiciting ssome informations like below: Time: 08 AM - 11 AM Duration : 36

问题 In oracle what's the differences between a database and a table space? 回答1: A little terminology: Oracle defines a database as the set of files that you find on your Oracle system. This means all data in your Oracle system is in these database files, commonly known as "data files". There are other files in the database such as parameter files and redo logs. On the other hand, an instance consists of the processes and memory areas that Oracle database uses. Together, a database and an instance

问题 Is there a performance difference between using a BETWEEN clause or using <= AND >= comparisons? i.e. these two queries: SELECT * FROM table WHERE year BETWEEN '2005' AND '2010'; ...and SELECT * FROM table WHERE year >= '2005' AND year <= '2010'; In this example, the year column is VARCHAR2(4) with an index on it. 回答1: There is no difference. Note that BETWEEN is always inclusive and sensitive to the order of the arguments. BETWEEN '2010' AND '2005' will never be TRUE . 回答2: There is no

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Oracle RAC and sequences I have a Oracle RAC configured in my local environment. I analyzed a problem with Sequnce that the number generated by nextVal are not ordered. Suppose First time I get value as 1 , the second time get get value as 21 (I have configured the sequence as with default CACHE 20 and NOORDER ). On searching I found the solution that, I need to Order the sequence. I have question which is

问题 What are the difference between Oracle DATE and TIMESTAMP type? Both have date and time component? Also what is corresponding type in Java for these date types? 回答1: DATE and TIMESTAMP have the same size (7 bytes). Those bytes are used to store century, decade, year, month, day, hour, minute and seconds. But TIMESTAMP allows to store additional info such as fractional seconds (11 bytes) and fractional seconds with timezone (13 bytes). TIMESTAMP was added as an ANSI compliant to Oracle. Before

问题 So i have this: SELECT p.plantnaam,o.levcode,o.offerteprijs FROM plant p, offerte o JOIN (SELECT plantcode , MIN(offerteprijs) AS offprijs FROM offerte GROUP BY plantcode) s ON s.plantcode = p.plantcode AND s.offprijs = o.offerteprijs ORDER BY p.plantnaam,l.levcode Appearently on the 6th row, p.plantcode is suddenly magically an invalid identifier. Why is this? and why are all the others from the exact same table perfectly fine before that point? 回答1: The problem is that you are mixing JOINs.

问题 Below are my table structures : Table -Customer CustomerID Blacklisted Customer Name 101 Y ABC 102 Y DEF Table -Blacklist CustomerID BlacklistID Customer Name 101 1011 ABC 102 1012 DEF Table -Reason BlacklistID ReasonID Reason Code 1012 02 Rcode2 Main table "Customer" is to store customer information.There is a trigger after update on table "Customer" to insert record in table "Blacklist" if somebody updates the blacklisted as Y in customer table. We consider the customer as blacklisted if ,

问题 I have a problem where I am creating a table using the execute immediate command in the stored procedure. However I get the error of "insufficient privileges". I checked other threads and made sure that the user has "CREATE TABLE" privilege granted to it. However I still keep seeing the same error. SQL> select * from USER_SYS_PRIVS; USERNAME PRIVILEGE ADM ------------------------------ ---------------------------------------- --- MYUSER CREATE VIEW NO MYUSER UNLIMITED TABLESPACE NO SQL>

问题 I'm trying to understand what the bytes from the timestamp set on my DB mean. How do they get computed to generate the more readable date? I'm using the below query to get the data that I need: SELECT systimestamp ,DUMP (systimestamp) ,sessiontimezone FROM dual; And the output of my above query is: +-------------------------------------+-----------------------------------------------------------------+------------------+ | systimestamp | dump(systimestamp) | sessiontimezone | +---------------