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• Are there disadvantages to using VARCHAR(MAX) in a table?

  - by Meiscooldude

  Here is my predicament. Basically, I need a column in a table to hold up an unknown length of characters. But I was curious if in Sql Server performance problems could arise using a VARCHAR(MAX) or NVARCHAR(MAX) in a column, such as: 'This time' I only need to store 3 characters and most of the time I only need to store 10 characters. But there is a small chances that It could be up to a couple thousand characters in that column, or even possibly a million, It is unpredictable. But, I can guarantee that it will not go over the 2GB limit. I was just curious if there are any performance issues, or possibly better ways of solving this problem where available.

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• Microsoft Sync Framework - How to reprovision a table (or entire scope) fater schema changes?

  - by Rabbi

  B"H I have already setup Syncing with Microsoft Sync Framework, and now I need to add fields to a table. How do I re-provision the databases? The setup is exceedingly simple: Two sql express 2008 servers The scope includes the entire database Using Microsoft Sync Framework 2.0 Synchronizing by direct access. Using the standard new SqlSyncProvider Do I make the structural changes at both ends? Or do I only change one Server and let Sync Framework somehow propagate the change? Do I need to delete the _tracking tables and/or the stored procedures? How about the triggers? Has anyone been using the Sync Framework? Please help.

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• Unable to allocate new pages in table space "XXXX" ... but it's 250 megs and I'm only running DDL

  - by Sylvia

  Hello, I'm a DB2 newbie, so I'd appreciate even any pointers on where to start looking. We have great DB2 admins but they're swamped with other issues now, so I'm trying to do some troubleshooting on a development database. My situation is that I have a tablespace that's giving me this error message Unable to allocate new pages in table space "[MyTableSpace]". However, all I'm doing is running multiple (hundreds) of DDL statements, mainly creating tables but also indexes and pk scripts. So, considering that the tablespace has about 250 mg, I shouldn't be running out of space, right? Here's another thing - it appears that after I leave my script for a while, something "resets" and works for a while, then I begin to have the tablespace issue again. thanks, Sylvia

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• One repository per table or one per functional section?

  - by Ian Roke

  I am using ASP.NET MVC 2 and C# with Entity Framework 4.0 to code against a normalised SQL Server database. A part of my database structure contains a table of entries with foreign keys relating to sub-tables containing drivers, cars, engines, chassis etc. I am following the Nerd Dinner tutorial which sets up a repository for dinners which is fair enough. Do I do one for drivers, one for engines, one for cars and so on or do I do one big one for entries? Which is the best practise for this type of work? I am still new to this method of coding.

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• How can I set a highlighted image on a table view cell?

  - by nevan

  I've followed the code in Apple's AdvancedTableViewCells and built a table view with a background image for cells. Now I want to change it so that instead of the blue highlight colour, it shows a darker version of my image. What are the steps I need to follow to do this? I'm using a UITableViewCell subclass with a custom NIB. My background image is implemented as the cell.backgroundView. The steps I've take so far are: Change the selectionStyle of the cell to "None" Set the Highlight colour on my UILabel subviews to a light colour Create a darker version of my background as a separate image Override setSelected: animated: I'm wondering about the next steps.

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• In T-SQL how to display columns for given table name?

  - by salvationishere

  I am trying to list all of the columns from whichever Adventureworks table I choose. What T-sQL statement or stored proc can I execute to see this list of all columns? I want to use my C# web app to input one input parameter = table_name and then get a list of all the column_names as output. Right now I am trying to execute the sp_columns stored proc which works, but I can't get just the one column with select and exec combined. Does anybody know how to do this?

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• Changing a table-valued function that a stored procedure calls is not recognized?

  - by Peter

  Hey all I have a stored procedure sp that calls a table-valued function tvf. Sometimes I modify the tvf but when subsequently executing sp, the output from sp is the same as before the modification. It seems like it is cached or compiled or something. If I make some dummy change to the sp, then I get the right output of the sp. Is there some way, I can overcome this problem? In Oracle it is possible to re-compile all stored procedures, but I haven't been able to figure out how to do this in SQL Server? Any help is highly appreciated.

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• Recreation of MySQL DB using "mysql mydb < mydb.sql" is really slow when the table has tens of milli

  - by Jian Lin

  It seems that a MySQL database that has a table with tens of millions of records will get a big INSERT INTO statement when the following mysqldump some_db > some_db.sql is done to back up the database. (is it 1 insert statement that handles all the records?) So when reconstructing the DB using mysql some_db < some_db.sql then the CPU is hardly busy (about 1.8% usage by the mysql process... I don't see a mysqld either?) and also the hard disk doesn't seem to be too busy... Last time, the whole restore process took 5 hours. Is there a way to make it faster? Such as, when doing mysqldump, can it break the INSERT statement into shorter ones, so that the mysql doesn't need to parse the line so hard when restoring the DB?

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• Create a Font using strings pulled from a string table.

  - by Matthew Smith

  I am writing a tool to create an otf or ttc with only characters defined in our localized string table, so we can cut down memory usage. I already have the information for the Japanese characters we are using but I am unable to find an example of creating a new font based around these characters. Does anyone know of a good example or even the interface I can access to do this? I am working in C# with .NET 3.5. I am looking into Volt and TTOasm from Microsoft, but I am not sure if they will do exactly what I need. Any information is appreciated. Thanks, Matt Smith

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• How would I UPDATE these table entries with SQL and PHP?

  - by CT

  I am working on an Asset Database problem. I enter assets into a database. Every object is an asset and has variables within the asset table. An object is also a type of asset. In this example the type is server. Here is the Query to retrieve all necessary data: SELECT asset.id ,asset.company ,asset.location ,asset.purchaseDate ,asset.purchaseOrder ,asset.value ,asset.type ,asset.notes ,server.manufacturer ,server.model ,server.serialNumber ,server.esc ,server.warranty ,server.user ,server.prevUser ,server.cpu ,server.memory ,server.hardDrive FROM asset LEFT JOIN server ON server.id = asset.id WHERE asset.id = '$id' I then assign all results into single php variables. How would I write a query/script to update an asset?

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• How to sekect latest chnge done in the given Table structure?

  - by OM The Eternity

  I have a Table structure as id, trackid, table_name, operation, oldvalue, newvalue, field, changedonetime Now if I have 3 rows for the same "trackid" same "field", then how can i select the latest out of the three? i.e. for e.g.: id = 100 trackid = 152 table_name = jos_menu operation= UPDATE oldvalue = IPL newvalue = IPLcccc field = name live = 0 changedonetime = 2010-04-30 17:54:39 and id = 101 trackid = 152 table_name = jos_menu operation= UPDATE oldvalue = IPLcccc newvalue = IPL2222 field = name live = 0 changedonetime = 2010-04-30 18:54:39 As u can see above the secind entry is the latest change, Now what query I shoud use to get the only one and Latest row out of many such rows...

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• How would I UPDATE these table entries with SQL?

  - by CT

  I am working on an Asset Database problem. I enter assets into a database. Every object is an asset and has variables within the asset table. An object is also a type of asset. In this example the type is server. Here is the Query to retrieve all necessary data: SELECT asset.id ,asset.company ,asset.location ,asset.purchaseDate ,asset.purchaseOrder ,asset.value ,asset.type ,asset.notes ,server.manufacturer ,server.model ,server.serialNumber ,server.esc ,server.warranty ,server.user ,server.prevUser ,server.cpu ,server.memory ,server.hardDrive FROM asset LEFT JOIN server ON server.id = asset.id WHERE asset.id = '$id' How would I write a query to update an asset?

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• Best practices for querying an entire row in a database table? (MySQL / CodeIgniter)

  - by Walker

  Sorry for the novice question! I have a table called cities in which I have fields called id, name, xpos, ypos. I'm trying to use the data from each row to set a div's position and name. What I'm wondering is what's the best practice for dynamically querying an unknown amount of rows (I don't know how many cities there might be, I want to pull the information from all of them) and then passing the variables from the model into the view and then setting attributes with it? Right now I've 'hacked' a solution where I run a different function each time which pulls a value using a query ('SELECT id FROM cities;'), then I store that in a global array variable and pass it into view. I do this for each var so I have arrays called: city_idVar, city_nameVar, city_xposVar, city_yposVar then I know that the city_nameVar[0] matches up with city_xposVar[0] etc. Is there a better way?

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• Cannot call scalar-valued CLR UDF from select ... from table statement

  - by Henrik B

  I have created a scalar-valued CLR UDF (user defined function). It takes a timezone id and a datetime and returns the datetime converted to that timezone. I can call it from a simple select without problems: "select dbo.udfConvert('Romance Standard Time', @datetime)" (@datetime is of course a valid datetime variable) But if I call it passing in a datetime from a table it fails: "select dbo.udfConvert('Romance Standard Time', StartTime) from sometable" (column StartTime is of course a column of type datetime) The error message is: "Cannot find either column "dbo" or the user-defined function or aggregate "dbo.udfConvert", or the name is ambiguous." This message is really for beginners that has misspelled something, but as it works in one case and not in the other, I don't think I have done any misspellings. Any ideas?

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• MSSQL STOREDPROC SELECTING FROM A FIELD FROM 1 TABLE USING LIKE TO CREATE MORE THAN 1 COLUM IN A DAT

  - by djshortbus

  I have a ASPX.NET DataGrid and im trying to USE a select LIKE 'X'% from a table that has 1 field called location. im trying to display the locations that start with a certain letter (example wxxx,axxx,fxxx,) in different columns in my data grid. SELECT DISTINCT LM.LOCATION AS '0 LOCATIONS' , LM.COUNTLEVEL AS 'COUNTLEVEL' FROM SOH S WITH(NOLOCK) JOIN LOCATIONMASTER LM ON LM.LMID = S.LMID WHERE LM.COUNTLEVEL = 1 AND LM.LOCATION NOT IN ('RECOU','PROBLEM','TOSTOCK','PYXVLOC') AND LM.LOCATION LIKE '0%' SELECT DISTINCT LM.LOCATION AS 'A LOCATIONS' , LM.COUNTLEVEL AS 'COUNTLEVEL' FROM SOH S WITH(NOLOCK) JOIN LOCATIONMASTER LM ON LM.LMID = S.LMID WHERE LM.COUNTLEVEL = 1 AND LM.LOCATION NOT IN ('RECOU','PROBLEM','TOSTOCK','PYXVLOC') AND LM.LOCATION LIKE 'A%'

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• How to select the nth row in a SQL database table?

  - by Charles Roper

  I'm interested in learning some (ideally) database agnostic ways of selecting the nth row from a database table. It would also be interesting to see how this can be achieved using the native functionality of the following databases: SQL Server MySQL PostgreSQL SQLite Oracle I am currently doing something like the following in SQL Server 2005, but I'd be interested in seeing other's more agnostic approaches: WITH Ordered AS ( SELECT ROW_NUMBER() OVER (ORDER BY OrderID) AS RowNumber, OrderID, OrderDate FROM Orders) SELECT * FROM Ordered WHERE RowNumber = 1000000 Credit for the above SQL: Firoz Ansari's Weblog Update: See Troels Arvin's answer regarding the SQL standard. Troels, have you got any links we can cite?

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• How Do I insert Data in a table From the Model MVC?

  - by user54197

  I have data coming into my Model, how do I setup to insert the data in a table? public string Name { get; set; } public string Address { get; set; } public string City { get; set; } public string State { get; set; } public string Zip { get; set; } public Info() { using (SqlConnection connect = new SqlConnection(connections)) { string query = "Insert Into Personnel_Data (Name, StreetAddress, City, State, Zip, HomePhone, WorkPhone)" + "Values('" + Name + "','" + Address + "','" + City + "','" + State + "','" + Zip + "','" + ContactHPhone + "','" + ContactWPhone + "')"; SqlCommand command = new SqlCommand(query, connect); connect.Open(); command.ExecuteNonQuery(); } } The Name, Address, City, and so on is null when the query is being run. How do I set this up?

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• The best way to display data in a table view?

  - by LawVS

  Hey guys, I'm trying to display nutritional information in a table view but am struggling about the best way to show the info. I don't want to create unique views for each page as that would take up a lot of space. My ideal avenue would be like a website having links to data pages instead of individual views for each page. How would I best implement that? For example, I would want the first page to be a list of restaurants, then as you press the restaurant it would list the different types of food...the next page would be a list of those foods and then the final page would be the nutrition info itself. Thanks

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• Want to build simple SQL admin interface to change a few values in a table.

  - by Adam McC

  i am currently building a system in MSSQL 2K5. i have a table that holds information about certain insurance schemes such as overheads and other things. these values will change occasionally and currently i administer the database straight through the management Studio. i would like to build a simple interface that will allow my colleagues to change these values by selecting the company in a dropdown and the current values will populate. they can then edit these values and submit them to the database. is this possible in the current Visual Studio supplied with MSSQL server 2K5 or do i need to get another product. i am confident that with the help of stack overflow and google i can build this myself, but i need pointed in the right direction as to which environment would be easiest and best to start building it. Many thanks, adam

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• How to skip all the column names in MySQL when the table has auto increment primary key?

  - by Jian Lin

  A table is: mysql> desc gifts; +---------------+-------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------+-------------+------+-----+---------+----------------+ | giftID | int(11) | NO | PRI | NULL | auto_increment | | name | varchar(80) | YES | | NULL | | | filename | varchar(80) | YES | | NULL | | | effectiveTime | datetime | YES | | NULL | | +---------------+-------------+------+-----+---------+----------------+ the following is ok: mysql> insert into gifts -> values (10, "heart", "heart_shape.jpg", now()); Query OK, 1 row affected (0.05 sec) but is there a way to not specify the "10"... and just let each one be 11, 12, 13... ? I can do it using mysql> insert into gifts (name, filename, effectiveTime) -> values ("coffee", "coffee123.jpg", now()); Query OK, 1 row affected (0.00 sec) but the column names need to be all specified. Is there a way that they don't have to be specified and the auto increment of primary key still works? thanks.

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• How many records can i store in a Sql server table before it's getting ugly?

  - by Michel

  Hi, i've been asked to do some performance tests for a new system. It is only just running with a few client, but as they expect to grow, these are the numbers i work with for my test: 200 clients, 4 years of data, and the data changes per.... 5 minutes. So for every 5 minutes for every client there is 1 record. That means 365*24*12 = 105.000 records per client per year, that means 80 milion records for my test. It has one FK to another table, one PK (uniqueidentifier) and one index on the clientID. Is this something SqlServer laughs about because it isn't scaring him, is this getting too much for one quad core 8 GB machine, is this on the edge, or..... Has anybody had any experience with these kind of numbers?

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• How much difference you find between scrollview offset and contentview offset of table?

  - by neha

  Hi all, In my application, I want to detect the end of the entire table with scrollview. Since there're no sections in my scrollview, I'm using noOfRows*rowHeight to reach the end. I'm using scrollview.contentOffset.y to detect the y offset, but this contentOffset isn't matching the multiplication result i.e. I have 20 rows and with height as 250. So it comes as 5000, but my scrollview.offset.y at the end of last cell is nearly about 4650. What's this difference? Thanx in advance.

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• Checking for reciprocal relationships in mysql. A trivial one table problem.

  - by calumbrodie

  I have a mysql table that stores relationships. Items can be related to another item in one direction, or both items can be related to each other. I want to return all items related to my primary item - but I also want to check to see if the related item has a 'reverse relationship' to the current item and show this as a boolean |--------------|---------------| | SKU | related_SKU | |--------------|---------------| | 0001 | 0099 | | 0002 | 0099 | | 0099 | 0001 | |--------------|---------------| If I want to get all relationships for SKU=0001 SELECT related_SKU from relationships where SKU='0001' returns |--------------| | related_SKU | |--------------| | 0099 | |--------------| but what I want is |--------------|---------------| | related_SKU | reciprocal | |--------------|---------------| | 0099 | 1 | |--------------|---------------| or SELECT related_SKU from relationships where SKU='0002' |--------------|---------------| | related_SKU | reciprocal | |--------------|---------------| | 0099 | 0 | |--------------|---------------| What's the best way to do this?

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• Recreation of DB using "mysql mydb < mydb.sql" is really slow when the table has tens of millions of

  - by Jian Lin

  It seems that a MySQL database that has a table with tens of millions of records will get a big INSERT INTO statement when the following mysqldump some_db > some_db.sql is done to back up the database. (is it 1 insert statement that handles all the records?) So when reconstructing the DB using mysql some_db < some_db.sql then the CPU is hardly busy (about 1.8% usage by the mysql process... I don't see a mysqld either?) and also the hard disk doesn't seem to be too busy... Last time, the whole restore process took 5 hours. Is there a way to make it faster? Such as, when doing mysqldump, can it break the INSERT statement into shorter ones, so that the mysql doesn't need to parse the line so hard when restoring the DB?

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• Will this LINQ-TO-SQL query fetch all records from the table ?

  - by Puneet Dudeja

  public long GetNewCRN() { return ((from c in DataContext.GetTable<Cust_Master>() select c.CUSTSERH_CRN).Max() + 1); } Will this Linq to Sql query fetch all records from the table first and then select the maximum of the column ? If yes, then isn't it a bad idea using linq to sql instead of normal SqlCommand ? Or is there any other way of doing it in linq to sql ? When I attach Console.Out, I see nothing(command prompt does not even open). But when I include following:- context.Log = new System.IO.StreamWriter("d:\\abcd.txt"); I get an error, that "The process can not access the file because it is being used by another process" and that process is "w3wp.exe". How can I see the sql commands being executed by DataContext then ?

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