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• When is `x IS NOT NULL` not the same as `NOT(x IS NULL)`

  - by Mark Hurd

  For what x is The expression x IS NOT NULL is not equal to NOT(x IS NULL), as is the case in 2VL (quote from this answer, which is quoting Fabian Pascal Practical Issues in Database Management - A Reference for the Thinking Practitioner -- near the end of that answer) My guess is when x IS NULL is NULL, but I cannot guess when that would be (i.e. I haven't checked the SQL standard).

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• How to escape special characters when retrieving data from database?

  - by ziang

  I am going to generate XML file based on the data returned from SQL Server, but there are some special characters like &#x1F; and &#x1C; (there may be other characters like these), which will fail the XML. Is there any way to escape them? Thanks!

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• When would isSearchable return false for an Oracle JDBC column?

  - by Ian Varley

  In what cases would a call to java.sql.ResultSetMetaData.isSearchable(int col) return false for an Oracle database? The documentation for the method doesn't really answer the question: "Indicates whether the designated column can be used in a where clause." I can think of only one case - when the column is the result of an aggregate function (in which case it would have to be part of a HAVING filter, not a WHERE filter). Are there any other cases?

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• Deploying and calling SSIS package from .NET

  - by alexbf

  I have a SSIS package that I plan to deploy on my SQL Server 2008 machine. I need to call this SSIS package remotely and synchronously from .NET. Obviously I need to pass parameters to this package as well. How could I do that? Thanks, Alex

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• How to create window service to read the xml file

  - by angel ansari

  hi, i have to create window service which read the xml file and and take the node's value to connect the sql server and create the log file i have already created window application for that but i don't know how to create win services.

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• Oracle: How to update master with newest row from detail table?

  - by LukLed

  We have two tables: Vehicle: Id, RegistrationNumber, LastAllocationUserName, LastAllocationDate, LastAllocationId Allocations: Id, VehicleId, UserName, Date What is the most efficient (easiest) way to update every row in Vehicle table with newest allocation? In SQL Server I would use UPDATE FROM and join every Vehicle with newest Allocation. Oracle doesn't have UPDATE FROM. How do you do it in Oracle?

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• how to read the datas from text file stored in the database

  - by Ranjana

  i have a txt file stored in my sql DB, in that .txt file i have certain numbers like 99435 87889 33455 33555 34556 how to get the count of these numbers from the txtfile stored in the database and also to read the file and fetch the number one bye one in a string. using asp.net (C#)

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• [Android] Putting Serializable Classes into SQL?

  - by CaseyB

  Here's the situation. I have a bunch of objects that implement Serializable that I want to store in a SQL database. I have two questions Is there a way to serialize the object directly into the database Is that the best way to do it or should I Write the object out to a formatting String and put it in the database that way and then parse it back out Write each member to the database with a field that is unique to each object

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• How do I programmatically create a Sql Server Reporting Services DataSource

  - by WOPR

  I have an application that creates a Sql Server 2008 database. When I create the database, I would also like to create a datasource for SSRS. How can I do this?

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• How can I change column length using HQL query?

  - by gmugmu

  I tried session.createSQLQuery("ALTER TABLE People MODIFY address VARCHAR(1000);").executeUpdate(); but this throws org.hibernate.exception.SQLGrammarException: could not execute native bulk manipulation query After a lot of googling, the recommendation is to use HQL instead of SQL query to do bulk updates. Not sure how to use HQL to accomplish this. There seems to be no decent HQL documentation for updating column length in a table. Thanks so much for the help.

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• Best Embedded SQL DB for write performance?

  - by max.minimus

  Has anybody done any benchmarking/evaluation of the popular open-source embedded SQL DBs for performance, particularly write performance? I've some 1:1 comparisons for sqlite, Firebird Embedded, Derby and HSQLDB (others I am missing?) but no across the board comparisons... Also, I'd be interested in the overall developer experience for any of these (for a Java app).

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• Select statement to check multiple rows against 2 variables

  - by Duncan Cook

  I have the following table : alertID inspectorID datelive dateread 1 none 2012-11-06 10:36:03.350 NULL 2 none 2012-11-06 10:36:25.043 NULL 3 none 2012-11-06 10:36:42.433 NULL 1 31030 2012-11-06 10:37:19.193 2012-06-11 10:34:47.000 I want to select the alerts that dont have the inspectors ID against it AND where the alert ID doenst match the one that has the inspectorID against it, ie inspector has read alert 1 so i only want it to return alerts 2 & 3 Am using Classic ASP and MS-SQL Cheers

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• Encoding in SQL to CSV

  - by Z77

  When do I execute query COPY TO ... CSV, I create CSV file. BUt when open it column with names in excel that should be with national characters are not as it should be. So my question is, If it is possible within a sql query to change this encoding to utf8? Or something else? Because I want that new created CSV file to be as final product for user on web. I hope someone understood what I want:)

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• MS-Access: SQL for updating a column in a table

  - by tecnodude

  Hi, I have the following table in an access database id VisitNo Weight 1 1 100 1 2 95 1 3 96 1 4 94 1 5 93 Now row 2 and 4 are deleted. So i have... id VisitNo Weight 1 1 100 1 3 96 1 5 93 However what i need is... id VisitNo Weight 1 1 100 1 2 96 1 3 93 What is the SQL query i need to accomplish the above? thanks

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• Which is better: Ad hoc queries, or stored procedures?

  - by Will

  Assuming you can't use Linq for whatever reason, is it a better practice to place your queries in stored procedures, or is it just as good a practice to execute ad hoc queries against the database (say, Sql Server for argument's sake)?

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• group by with value of another column

  - by phenevo

  Hi, I've got table Articles ID identity autoincement, IDArticle: nvarchar(100) ,IDCar nvarchar(100), createddate How to convert this: SELECT IDCar , MAX(createddate) FROM Articles GROUP BY IDCar to get IDArticle eg: 1 art1 BWM 5-21-2010 2 art2 BMW 5-24-2010 3 art3 BMW 5-31-2010 4 art4 Porshe 5-31-2010 5 art5 Porshe 6-1-2010 Expecting result is: art3 art5 It's not duplicated with: http://stackoverflow.com/questions/2736769/sql-query-number-of-occurance/2736809#2736809

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• How do I TRUNCATE TABLE using Django orm?

  - by Silver Light

  Hello! To empty database table, I use this SQL Query: TRUNCATE TABLE `books` How to I Truncate table using Django models and orm? I've tried this, but it doesn't work: Book.objects.truncate()

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• LINQ Option Missing in Data Source for Grid View

  - by stringo0

  Hi, I don't see a LINQ option when picking a data source for a grid view - any ideas? I just upgraded to Visual Web Developer 2010. I see the other options like SQL etc. Thanks!

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• Refreshing data in a java.sql.ResultSet

  - by llm

  I have a java.sql.ResultSet object containg data from a query that was run. How do I refresh the data in the ResultSet to reflect the current data in the database? Thanks!

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• ms-access: specifying formatting for a column

  - by every_answer_gets_a_point

  i would like all data that is entered into a specific column to always have a trailing comma and also i need the first character to always be a comma. how do i do this? the best solution is probably not in vba or sql but probably the properties of the table?

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• Inserting a null value into the database.

  - by J Harley

  Good Morning, Say I have an insert statement: Insert INTO tblTest (fieldOne,FieldTwo,fieldThree) VALUES ('valueOne','valueTwo','null') This statement doesn't seem to want to insert a null value into the database... I have also tried to insert the word "nothing". Has anyone any ideas how to make this work? I am using SQL server 2005.

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• How to use the IN operator in linq

  - by Hallaghan

  I'm querying a view and filtering the results with a column named status. I'd like to query it so I can search for rows with different status, by using the IN operator as I'd do in SQL. As so: SELECT * FROM VIEW WHERE Status in ('....', '.....') How can I achieve this?

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• How to identify the culprit in "Error converting data type varchar to numeric"?

  - by Stan

  An insert statement with a large number of values returns 'Error converting data type varchar to numeric.' How can I find which value actually triggers the error? MS SQL Server 2008 is used.

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• select xml data column into flat reporting table

  - by Bernard

  We have a xml column in SQL Server 2008. We need to do reporting off the data in the xml so we're going to select the xml into a flat table. The flat table has columns that correspond to various nodes in the xml. What is the best way to do this using SSIS? Is this a good approach? Or should we just try and write the reports directly off the xml column?

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• In mysql or postgres, is there a limit to the size of an IN (1,2,n) statement?

  - by Kyle

  I've got quite a few SQL statements like such: SELECT foo FROM things WHERE user_id IN (1,2,3..n) Is there a known limit to the number of elements that will safely fit in an IN clause like that?

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