row

问题 I found this solution for selecting a random row from a table in Oracle. Actually sorting rows in a random manner, but you can fetch only the first row for a random result. SELECT * FROM table ORDER BY dbms_random.value; I just don't understand how it works. After ORDER BY it should be a column used for sorting. I see that "dbms_random.value" returns a value lower than zero. This behavior can be explained or is just like that? Thanks 回答1: you could also think of it like this: SELECT col1,

问题 I have been accessing the rows of Gridview quite easily using javascript. But when I try to add a new row and then try to access, then the code is not working. Is there a way by which I can access the footer row text box? Below is my code which works well when edit mode text boxes are to be accessed. Please donot post any link. function OnSelectIndexChange() { var drpdwn = document.getElementById("ddlSelectUnderwriterCond"); var drpdwnValue = drpdwn.options[drpdwn.selectedIndex].text; var

问题 I am new to hbase and hadoop. Anyhow I have succeeded in setting up a hadoop cluster which consists of 3 machines. Now I need some help on building up the database. I have a table "comments" contains fields: user id comments comments on comments (which can be more than one) and a status field to the same say, Could any one help me out to build the same using hbase/shell? 回答1: Here's some helpful HBase shell commands for you. Get help on format for creating a table in the shell. help 'create'

问题 I am building a system of multiple trackers that are going to use a lot of the same columns so there is a table for the trackers, the tracker columns, then a cross reference for which columns go with which tracker, when a user inserts a tracker row the different column values are stored in multiple rows that share the same record id and store both the value and the name of the particular column. I need to find a way to dynamically change the column name of the value to be the column name that

问题 i have simple gridview. it's elements have different height. for example in row there are one small element and one bigger, next row will align to smaller element and a part of bigger element is under the second row. how can i set the height of each row of gridview to be the height of the biggest element in row?? my gridview <GridView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/new_small_list" android:layout_width="fill_parent" android:layout_height="wrap

问题 I have a JTable with multiple rows and every row is presented via Point on a scatter plot. What I have to do is when a given point is selected on the scatter plot I have to associate this selection with selecting of the corresponding row in the JTable. I have an Integer that represents, which row I have to highlight. What I tried is: JTable table = new JTable(); ... ...// a bit of code where I have populated the table ... table.setRowSelectionInterval(index1,index2); So the problem here is

问题 I'll try to make this clear. I need to select a specific row and one row previous relative from that selected row and one row next relative from that selected row without using id's. Is this possible? Previous and next one, in short. The reason why I can't (maybe I just don't know how) use id's, is because they are not in sequential order. They have gaps as you can see from this rather immature and random example. TABLE <-the name of the table +----+----------------------+-------+ | id | name

问题 Imagine I have a data.table, for example: library(data.table) RRR <-data.table(1:15,runif(15),rgeom(15,0.5),rbinom(15,2,0.5)) V1 V2 V3 V4 1: 1 0.33577273 0 0 2: 2 0.66739739 2 1 3: 3 0.07501655 0 0 4: 4 0.43195663 2 1 5: 5 0.39525841 3 2 6: 6 0.15189738 1 1 7: 7 0.02637279 0 1 8: 8 0.44165623 0 1 9: 9 0.98710570 2 0 10: 10 0.62402805 1 0 11: 11 0.84829465 3 2 12: 12 0.02170976 0 1 13: 13 0.74608925 0 2 14: 14 0.29102296 2 0 15: 15 0.83820646 1 1 How can I get a data.table from it, with all

问题 I've an HBase table where I'm writing the row keys like: <prefix>~1 <prefix>~2 <prefix>~3 ... <prefix>~9 <prefix>~10 The scan on the HBase shell gives an output: <prefix>~1 <prefix>~10 <prefix>~2 <prefix>~3 ... <prefix>~9 How should a row key be designed so that the row with key <prefix>~10 comes last? I'm looking for some recommended ways or the ways that are more popular for designing HBase row keys. 回答1: How should a row key be designed so that the row with key ~10 comes last? You see the

问题 I have a GridView with 4 columns, when one is selected, I wanted to dynamically add a whole row underneath the selected cell, and inflate a layout in it, so that I could add some information about the selected cell. Is there anyway to do that? Or maybe, is there a way to split a view in half, then glue it back together when done? Sounds crazy. Essentially, I'm looking for something you can find on iTunes 11 (see the picture below). 回答1: Yeah. You can do that. the xml file where you defined