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  • Database design - How can I have a foreign key of the primary key in the same table?

    - by Sergio Tapia
    My database has to store all the available departments in my company. Some departments are sub-departments on another existing department. I've decided to solve this like this: Departments ID Description HeadOfDepartment ParentDepartment ParentDepartment can be null, indicating it is a root department. If it has a parent I'll act accordingly, my question is how can I code this in Microsoft SQL?

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  • How do I accurately handle a batch separator for SQL from C#

    - by Sam Saffron
    For Data Explorer I would like to add support for a Batch separator. So for example if users type in: select 'GO' go select 1 as go Go select 100 I would like to return the three result sets. Its clear that I need some sort of parser here, my hope is that this is a solved problem and I can just plug it in. (writing a full T-SQL parser is not something I would like to do) What component / demo code could achieve splitting this batch into its 3 parts?

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  • Suggestions on documentation of a DB model when using Entity Framework 4

    - by Junior Ewing
    Any experiences on how to document Entity Framework 4 based Database projects? There is the Document and Summary properties on the Entities, but if we want to regenerate the model from the database at some point, it will be lost! Is there some way to map documentation data inside SQL to the Entities in the EDMX file so it is safe. Suggestions of other best practices? Ideally I want to be able to augo generate html/helpfile documentation from the DB when we deploy.

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  • Insert data into SQL server with best performance

    - by Incognito
    I have an application which intensively uses DB (SQL Server). As it must have high performance I would like to know the fastest way to insert record into DB.Fastest from the standpoint of execution time. What should I use ? As I know the fastest way is to create stored procedure and to call it from code (ADO.NET). Please let me know is there any better way or may be there are is some other practices to increase performance.

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  • Get query from java.sql.PreparedStatement

    - by llm
    In my code I am using java.sql.PreparedStatement. I then execute the setString() method to populate the wildcards of the prepared statement. Is there a way for me to retrieve (and print out) the final query before the executeQuery() method is called and the query is executed? I Just want this for debugging purposes. Thanks.

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  • Public SQL database for educational purposes

    - by Grzegorz Oledzki
    I am looking for a publicly available SQL database with free access, where one can run some SELECT queries for free on some meaningful data (not item1, item2, item3). Have you seen any? Even better if it came together with some tutorial. Vendor is not that relevant, as long as one can connect using a generic JDBC client.

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  • Storing and retrieving dynamically created pdf in sql

    - by mwright
    I have been playing around with creation of pdf documents for a project that I'm working on. I would like to store the generated pdf document in a SQL database and then later be able to retrieve this pdf as well. What are some suggestions for doing this? Can the document be stored in the database without physically creating the document on the server?

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  • Sql Server: all object dependencies

    - by Gjorgji
    Hi, Is there any place where I can find all possible object dependencies in Sql Server? What I mean by "object dependency" is a list of object that one object can depend on. For example, TABLE can depend on SCHEMA, TYPE, TABLE, FUNCTION, etc.

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  • SQL SERVER - Understanding how MIN(text) works.

    - by tmercer
    I'm doing a little digging and looking for a explanation on how SQL server evaluates MIN(Varchar). I found this remark in BOL: MIN finds the lowest value in the collating sequence defined in the underlying database So if I have a table that has one row with the following values: Data AA AB AC Doing a SELECT MIN(DATA) would return back AA. I just want to understand the why behind this and understand the BOL a little better. Thanks!

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  • LINQ2SQL: how many datacontexts ?

    - by sh00
    I have a SQL Server 2008 database with 300 tables. The application I have to design is an Windows Forms app, .NET 3.5, C#. Which is the best way to work with LINQ2SQL ? I intend to make a datacontext for each business entity. Is there any problem ? I need to know if this way of working with LINQ has any disadvantage or can create performance issues ? Thanks.

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  • SQL Monitoring Overview

    - by andy
    Hi I currently loook after 20 odd databases in SQL server 2005 and need a tool for monitoring the performance and keep me informed if a database is running slow. Is there anything I can run within Managment studio of any other good third party tool (Pref free) that can do the job. Thanks

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  • Native SQL - How to set the schema and database names

    - by icelobber
    Im using Native SQL from ABAP language. The query to get data is something like this SELECT COUNT(ROWID) FROM <SCHEMANAME>.<TABLENAME>;@<DATABASENAME> INTO :localvariable I want to somehow set the schemaname and database name as default so that i do not need to use them in the SELECTs later. Then i can only use the table name in the SELECT. thanks !!

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  • ado sql update table with result of group by query

    - by brett
    I am trying to update records in an .mdb table with the number of records containing the same value The sql below does not work but I think gives an indication of what I am trying to achieve. UPDATE table1 AS A INNER JOIN (SELECT PH_BSP , Count(PH_BSP) AS PHCOUNT FROM table1 GROUP BY PH_BSP) AS B ON A.PH_BSP=B.PH_BSP SET A.PH_SORT = B.PHCOUNT; any ideas?

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  • SQL Server 2005-data count

    - by megala
    hi i created project using asp.net and sql server 2005.I created table and inserted datainto sqlserver 2005. but i dont how to find the(count) number of records stored in the table.how to find this?

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  • how to convert sql union to linq

    - by lowlyintern
    I have the following Transact SQL query using a union. I need some pointers as to how this would look in LINQ i.e some examples wouldbe nice or if anyone can recommend a good tutorial on UNIONS in linq. select top 10 Barcode, sum(ItemDiscountUnion.AmountTaken) from (SELECT d.Barcode,SUM(AmountTaken) AmountTaken FROM [Aggregation].[dbo].[DiscountPromotion] d GROUP BY d.Barcode UNION ALL SELECT i.Barcode,SUM(AmountTaken) AmountTaken FROM [Aggregation].[dbo].ItemSaleTransaction i group by i.Barcode) ItemDiscountUnion group by Barcode

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  • Converting a certain SQL query into relational algebra

    - by Fumler
    Just doing an assignment for my database course and I just want to double check that I've correctly wrapped my head around relational algebra. The SQL query: SELECT dato, SUM(pris*antall) AS total FROM produkt, ordre WHERE ordre.varenr = produkt.varenr GROUP BY dato HAVING total >= 10000 The relational algebra: stotal >= 10000( ?R(dato, total)( sordre.varenr = produkt.varenr( datoISUM(pris*antall(produkt x ordre)))) Is this the correct way of doing it?

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  • SQL Server Merge statement issue

    - by George2
    Hello everyone, I am learning and using SQL Server 2008 new Merge statement, merge statement will compare/operate source table and destination table row by row ("operate" I mean operations performed for when matched or not-matched conditions). My question is whether the whole merge process will be one transaction or each row comparison/operation will be one transaction? Appreciate if any document to prove it. thanks in advance, George

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  • SQL query for active users

    - by user344513
    This SQL query gives me today's number of users active in the last 30 days: SELECT COUNT(*) FROM table.users WHERE creation_tsz >= (now() - interval '30 days') How can I modify it to get not a single value, but a table of active users for a range of dates? Thanks, Rob

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  • How to sanitize sql fragment in Rails

    - by dimus
    I have to sanitize a part of sql query. I can do something like this: class << ActiveRecord::Base public :sanitize_sql end str = ActiveRecord::Base.sanitize_sql(["AND column1 = ?", "two's"], '') But it is not safe because I expose protected method. What is a better way to do it?

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