Search Results

Search found 10424 results on 417 pages for 'persisted column'.

Page 229/417 | < Previous Page | 225 226 227 228 229 230 231 232 233 234 235 236  | Next Page >

  • T-SQL - Left Outer Joins - Filters in the where clause versus the on clause.

    - by Greg Potter
    I am trying to compare two tables to find rows in each table that is not in the other. Table 1 has a groupby column to create 2 sets of data within table one. groupby number ----------- ----------- 1 1 1 2 2 1 2 2 2 4 Table 2 has only one column. number ----------- 1 3 4 So Table 1 has the values 1,2,4 in group 2 and Table 2 has the values 1,3,4. I expect the following result when joining for Group 2: `Table 1 LEFT OUTER Join Table 2` T1_Groupby T1_Number T2_Number ----------- ----------- ----------- 2 2 NULL `Table 2 LEFT OUTER Join Table 1` T1_Groupby T1_Number T2_Number ----------- ----------- ----------- NULL NULL 3 The only way I can get this to work is if I put a where clause for the first join: PRINT 'Table 1 LEFT OUTER Join Table 2, with WHERE clause' select table1.groupby as [T1_Groupby], table1.number as [T1_Number], table2.number as [T2_Number] from table1 LEFT OUTER join table2 --****************************** on table1.number = table2.number --****************************** WHERE table1.groupby = 2 AND table2.number IS NULL and a filter in the ON for the second: PRINT 'Table 2 LEFT OUTER Join Table 1, with ON clause' select table1.groupby as [T1_Groupby], table1.number as [T1_Number], table2.number as [T2_Number] from table2 LEFT OUTER join table1 --****************************** on table2.number = table1.number AND table1.groupby = 2 --****************************** WHERE table1.number IS NULL Can anyone come up with a way of not using the filter in the on clause but in the where clause? The context of this is I have a staging area in a database and I want to identify new records and records that have been deleted. The groupby field is the equivalent of a batchid for an extract and I am comparing the latest extract in a temp table to a the batch from yesterday stored in a partioneds table, which also has all the previously extracted batches as well. Code to create table 1 and 2: create table table1 (number int, groupby int) create table table2 (number int) insert into table1 (number, groupby) values (1, 1) insert into table1 (number, groupby) values (2, 1) insert into table1 (number, groupby) values (1, 2) insert into table2 (number) values (1) insert into table1 (number, groupby) values (2, 2) insert into table2 (number) values (3) insert into table1 (number, groupby) values (4, 2) insert into table2 (number) values (4) EDIT: A bit more context - depending on where I put the filter I different results. As stated above the where clause gives me the correct result in one state and the ON in the other. I am looking for a consistent way of doing this. Where - select table1.groupby as [T1_Groupby], table1.number as [T1_Number], table2.number as [T2_Number] from table1 LEFT OUTER join table2 --****************************** on table1.number = table2.number --****************************** WHERE table1.groupby = 2 AND table2.number IS NULL Result: T1_Groupby T1_Number T2_Number ----------- ----------- ----------- 2 2 NULL On - select table1.groupby as [T1_Groupby], table1.number as [T1_Number], table2.number as [T2_Number] from table1 LEFT OUTER join table2 --****************************** on table1.number = table2.number AND table1.groupby = 2 --****************************** WHERE table2.number IS NULL Result: T1_Groupby T1_Number T2_Number ----------- ----------- ----------- 1 1 NULL 2 2 NULL 1 2 NULL Where (table 2 this time) - select table1.groupby as [T1_Groupby], table1.number as [T1_Number], table2.number as [T2_Number] from table2 LEFT OUTER join table1 --****************************** on table2.number = table1.number AND table1.groupby = 2 --****************************** WHERE table1.number IS NULL Result: T1_Groupby T1_Number T2_Number ----------- ----------- ----------- NULL NULL 3 On - select table1.groupby as [T1_Groupby], table1.number as [T1_Number], table2.number as [T2_Number] from table2 LEFT OUTER join table1 --****************************** on table2.number = table1.number --****************************** WHERE table1.number IS NULL AND table1.groupby = 2 Result: T1_Groupby T1_Number T2_Number ----------- ----------- ----------- (0) rows returned

    Read the article

  • Copying Excel Worksheets in POI

    - by Patrick Nichols
    Does anyone know of a means to copy a worksheet from one workbook to another using POI? The Workbook class has a cloneSheet method, but there doesn't seem to be able to insert a cloned sheet into a new workbook? If there isn't an API to do this easily, does anyone have the code to copy all of the data (styles, column widths, data, etc) from one sheet to another? The jxls has methods to copy sheets, but they don't work when copying between workbooks.

    Read the article

  • unhandled exception occured in c#

    - by abid
    hey. i`m getting this error that system.data.datarowview is not permitted in this contexxt. valid expressions are constants expressions and ( in some contexts). column name are not permitted.. can any body guide me what this error says.. can any one provide me a suggestion whether where im wrong.. any guesses guys??? im not getting it.. :/

    Read the article

  • mysql index optimization for a table with multiple indexes that index some of the same columns

    - by Sean
    I have a table that stores some basic data about visitor sessions on third party web sites. This is its structure: id, site_id, unixtime, unixtime_last, ip_address, uid There are four indexes: id, site_id/unixtime, site_id/ip_address, and site_id/uid There are many different types of ways that we query this table, and all of them are specific to the site_id. The index with unixtime is used to display the list of visitors for a given date or time range. The other two are used to find all visits from an IP address or a "uid" (a unique cookie value created for each visitor), as well as determining if this is a new visitor or a returning visitor. Obviously storing site_id inside 3 indexes is inefficient for both write speed and storage, but I see no way around it, since I need to be able to quickly query this data for a given specific site_id. Any ideas on making this more efficient? I don't really understand B-trees besides some very basic stuff, but it's more efficient to have the left-most column of an index be the one with the least variance - correct? Because I considered having the site_id being the second column of the index for both ip_address and uid but I think that would make the index less efficient since the IP and UID are going to vary more than the site ID will, because we only have about 8000 unique sites per database server, but millions of unique visitors across all ~8000 sites on a daily basis. I've also considered removing site_id from the IP and UID indexes completely, since the chances of the same visitor going to multiple sites that share the same database server are quite small, but in cases where this does happen, I fear it could be quite slow to determine if this is a new visitor to this site_id or not. The query would be something like: select id from sessions where uid = 'value' and site_id = 123 limit 1 ... so if this visitor had visited this site before, it would only need to find one row with this site_id before it stopped. This wouldn't be super fast necessarily, but acceptably fast. But say we have a site that gets 500,000 visitors a day, and a particular visitor loves this site and goes there 10 times a day. Now they happen to hit another site on the same database server for the first time. The above query could take quite a long time to search through all of the potentially thousands of rows for this UID, scattered all over the disk, since it wouldn't be finding one for this site ID. Any insight on making this as efficient as possible would be appreciated :) Update - this is a MyISAM table with MySQL 5.0. My concerns are both with performance as well as storage space. This table is both read and write heavy. If I had to choose between performance and storage, my biggest concern is performance - but both are important. We use memcached heavily in all areas of our service, but that's not an excuse to not care about the database design. I want the database to be as efficient as possible.

    Read the article

  • Persisting Joda DateTime instead of Java Date in hibernate

    - by Tauren
    My entities currently contain java Date properties. I'm starting to use Joda Time for date manipulation and calculations quite frequently. This means that I'm constantly having to convert my Dates into Joda DateTime objects and back again. So I was wondering, is there any reason I shouldn't just change my entities to store Joda DateTime objects instead of Java Date objects? Please note that these entities are persisted via Hibernate. I found the jodatime-hibernate project, but I also was reading on the Joda mailing list that it wasn't compatible with newer versions of hibernate. And it seems like it isn't very well maintained. So I'm wondering if it would be best to just continue converting between Date and DateTime, or if it would be wise to start persisting DateTime objects. My concern is being reliant on a poorly maintained library. Edit: Note that one of my objectives is to be better able to store timezone information. Storing just a Date appears to save the date in the local timezone. As my application can be used globally, I need to know the timezone as well. Joda Time Hibernate seems to address this as well in the user guide.

    Read the article

  • Why do Unicode characters show up properly in database, but as ? when printed in Java via Hibernate?

    - by lupefiasco
    I'm writing a webapp, and interfacing with MySQL using Hibernate 3.5. Using "?????? ?????????" as my test string, I can input the string and see that it is properly persisted into the database. However, when I later pull the value out of the database and print to the console as a String, I see "?????? ?????????". If I use new OutputStreamWriter(System.out,"UTF-8"); then I get "„Éá„Çp„ÇØ„Éà„ÉÉ„Éó ·Éò·Éú·Éí·Éö·Éò·É°·É£·É†·Éò"". Why don't I see the original string? These are my hibernate.cfg.xml settings: <property name="hibernate.connection.useUnicode"> true </property> <property name="hibernate.connection.characterEncoding"> UTF-8 </property> <property name="hibernate.connection.charSet"> UTF-8 </property> and this is my database connection string: hibernate.connection.url = jdbc:mysql://localhost/mydatabase?autoReconnect=true&amp;useUnicode=true&amp;characterEncoding=UTF-8

    Read the article

  • How to hide specific header item in grid

    - by Vara Prasad.M
    Hi, I am using RadGrid and i am displaying the header item with months if the month data is null then i have to make invisible the entire column including the header text i am using Telerik version Grid. Please reply it fast Waiting for the reply, Thanks in Advance Vara Prasad.M

    Read the article

  • Compile Error: Ticks must be between DateTime.MinValue.Ticks and DateTime.MaxValue.Ticks. Parameter

    - by mickyjtwin
    I have a Visual Studio 2008 solution that when I build, returns the following error: Ticks must be between DateTime.MinValue.Ticks and DateTime.MaxValue.Ticks. Parameter name: ticks There is no reference file/line/column in the error. Becoming quite frustrating as the solution builds in the end, however I cannot debug. In the solution, there is no reference/using to DateTime.MinValue.Ticks at all...

    Read the article

  • How to design a grid containing TextView in Android

    - by Cris
    Hello, i need to realize an app for Android using this background image: Over every cell i have to draw a TextView, but i don't know how to do it with the different screens; i have the background image with 3 resolutions (240x320, 320x480, 480x800) but i don't know what kind of layout to use; i would use GridView but i don't know if i can work with different column size. Can anyone help me? Thanks in advance

    Read the article

  • How can a not null constraint be dropped?

    - by Tomislav Nakic-Alfirevic
    Let's say there's a table created as follows: create table testTable ( colA int not null ) How would you drop the not null constraint? I'm looking for something along the lines of ALTER TABLE testTable ALTER COLUMN colA DROP NOT NULL; which is what it would look like if I used PostgreSQL. To my amazement, as far as I've been able to find, the MySQL docs, Google and yes, even Stackoverflow (in spite of dozens or hundreds of NULL-related questions) don't seem to lead towards a single simple SQL statement which will do the job.

    Read the article

  • ActiveRecord + CodeIgniter - Return single value from query, not in array form.

    - by txmail
    Say you construct an activerecord query that will always just return a single value, how do you just address that single value instead of getting an array in return? For instance I am using an ActiveRecord query to return the SUM of a single column, it will only return this one single SUM, instead of having to parse the array is there a way to assign the value as a function return equal to that value instead of getting an array?

    Read the article

  • Adding ComboBoxItem to a combobox inside a user control (XAML/WPF)

    - by byte
    I am currently learning to create custom controls in WPF. I successfully created a simple custom control using a Label and a Text Box. I was able to allow setting the Label text by DependencyProperty. Now I am creating a user control that has a ComboBox. I need to allow adding items to this ComboBox from outside the control. To achieve this, I tried exposing a DependencyProperty of type ItemsCollection and it will allows access to the ComboBox's Items property (the DP in my control sample is named 'CbItems'). But I get errors because Items property of Combobox is ReadOnly. Control XAML <UserControl x:Class="MyWpfApp.Controls.MyControl" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="Auto" Width="Auto"> <Grid> <Grid.ColumnDefinitions> <ColumnDefinition /> <ColumnDefinition /> </Grid.ColumnDefinitions> <Label Grid.Column="0" Content="{Binding FieldLabel}"></Label> <ComboBox Name="cmb" Grid.Column="1" Width="150"></ComboBox> </Grid> </UserControl> MainWindow XAML <Window x:Class="MyWpfApp.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:ctl="clr-namespace:MyWpfApp.Controls" Title="Window1" Height="300" Width="300"> <Grid> <ctl:MyControl> <ctl:MyControl.CbItems> <ComboBoxItem>Hello</ComboBoxItem> <ComboBoxItem>World</ComboBoxItem> <ComboBoxItem>Hi</ComboBoxItem> </ctl:LobCombox.CbItems> </ctl:LobCombox> </Grid> </Window> I would like to know what the correct way is to achieve this functionality. I believe the answer to this might also help with other controls like GridView etc Many Thanks

    Read the article

  • MySQL table partitioning qn:

    - by JVXR
    I have a table (innodb) that will have billions of records eventually. Every 2nd week I expect ~ 500K records to get dropped into the table. I would want to partition this table based on the date on which the data is imported - luckily this is a field in the table that is of the format yyyy-mm-dd - Is it possible to partition it based on this date column ? I tried looking at the 18th chapter of mysql docs but couldn't figure out if this is possible. -tia

    Read the article

  • How to insert selected rows value of Gridview into Database in .net

    - by MAS1
    I am Developing Windows Form Application in .Net, I want to insert selected rows value of Gridview into database. First Column of my GridView is Checkbox, when user check one or more checkbox from gridview, i want to insert values of respective rows into Database. In Web application i done this using DataKeyNames property of GridView.Want to know how to do it in Windows Form Application. I am using Visual Studio 2005

    Read the article

  • MySQL Collation or PHP side to display accented letters properly

    - by Wayne
    What is the best Collation for the column that can allow to store accented letters and parse them out perfectly without any encoding error, because whenever I add an accented letter such as é, å, it shows out with an encoding problem on the PHP side, but in the MySQL side it's fine... How do I get the accented letters display properly?

    Read the article

  • Invalid parameter number: number of bound variables does not match number of tokens

    - by Alex
    I have a table: 'objects' with few columns: object_id:int, object_type:int, object_status:int, object_lati:float, object_long:float My query is : $stmt = $db->query('SELECT o.object_id, o.object_type, o.object_status, o.object_lati, o.object_long FROM objects o WHERE o.object_id = 1'); $res = $stmt->fetch(); Pdo throw error: SQLSTATE[HY093]: Invalid parameter number: number of bound variables does not match number of tokens When i remove column object_lati or object_long query is work fine.

    Read the article

  • Excel Macro to create sheets

    - by Harish
    I have a Excel sheet with two columns and I need to create new sheets based on the values of the first column.ie A B test1 Value21 test1 Values22 test2 Value21 test2 Value32 test3 Values32 IN this case I need to create three sheets namely test1,test2 and test3 Sheet 1 should contain test1 field and its corresponding values.Similarly sheet 2 and 3 should contain corresponding values. Can anyone help me in writing an Excel Macro for this

    Read the article

  • Cell value is read as #### in excel

    - by Sathish
    I am reading a cell value from excel using named range in my case sometime the column width is smaller then the value that is present in the cell and hence it is appearing as ##### when it is huge number. when i read this from csharp it is reading as #####. Any fix for this

    Read the article

  • tsql replace value on select

    - by Zelter Ady
    I have a column (SERVICE_ID) in my table where I can have only 3 values: 0, 1 and 2. I'd like on select, on displayed result table, to change those value with some english words. select client, SERVICE_ID from customers displays now: -------------------------- | John | 1 | Mike | 0 | Jordan | 1 | Oren | 2 -------------------------- I'd like to change the query to get: -------------------------- | John | QA | Mike | development | Jordan | QA | Oren | management -------------------------- There is any way to do this using only the select?

    Read the article

  • populating flexgrid with a file vb6

    - by Andeeh
    So I need to put all the names in a file into column 1 on flexgird, each name should go on its own row. here is what I have but i just get "invalid row value" namefile = App.Path & "\names.dat" Open namefile For Input As #1 While Not EOF(1) Input #1, x With MSFlexGrid1 .Col = 1 .Rows = rowcount + 1 .Text = x End With Wend End Sub Any help would be fantastic and thanks in advance

    Read the article

  • joining null in MS SQL server, Oracle and informatica

    - by jest
    hi! I've two tables to join with a column(say emp_id)..if emp_id in both the tables have null values, how'll MS SQL server and Oracle treat??? Coz, i read that informatica will neglect the NULL rows when joining..if i handle the null, by substituting -1, a cross-join will happen which i don't want.. what can i do here? I cannot completely neglect the rows which has NULL. Thanks

    Read the article

< Previous Page | 225 226 227 228 229 230 231 232 233 234 235 236  | Next Page >