sql

Performance of inter-database query (between linked servers)

I have an import between 2 linked servers. I basically got to get the data from a multiple join into a table on my side. The current query is something like this: select a.* from db1.dbo.tbl1 a inner join db1.dbo.tbl2 on ... inner join db1.dbo.tbl3 on ... inner join db1.dbo.tbl4 on ... inner join db2.dbo.mysid...

Pattern for creating a database schema using JDBC

I have a Java-application that loads data from a legacy file format into an SQLite-Database using JDBC. If the database file specified does not exist, it is supposed to create a new one. Currently the schema for the database is hardcoded in the application. I would much rather have it in a separate file as an SQL-Script, but apparently t...

How to perform a select using a WHERE NOT EXISTS

I'm using LINQ2SQL and I want to compare two tables and select all rows that are missing from one tables (based upon one of the column values). In standard SQL I would write this as: SELECT FirstName, LastName, RefId, Email FROM Users_ActiveDirectory AS ADU WHERE NOT EXISTS ( SELECT U.RefId FROM Users AS U WHERE U.RefID = ADU.RefId )...

Algorithm to fill slots

I am searching for an algorithm to fill several slots, which are already filled to some level. The current levels and the available quantity to fill are known Resulting levels should be as equal as possible, but existing level cannot be reduced Slots are filled from left to right, so left slots get higher level if equal level is imposs...

update columns when value is numeric in tsql

i want to normalize date fields from an old badly designed db dump. i now need to update every row, where the datefield only contains the year. update table set date = '01.01.' + date where date like '____' and isnumeric(date) = 1 and date >= 1950 but this will not work, because sql does not do short circuit evaluation of boolean expr...

SQL Server: get top xx blog record from Umbraco by parameter...

Following SQL get what I need: SELECT TOP (50) [nodeId] FROM [dbo].[cmsContentXml] WHERE [xml] like '%creatorID="29"%' AND [xml] like '%nodeType="1086"%' ORDER BY [nodeId] DESC I need to pass in the numbers as parameters, so I have follows: exec sp_executesql N'SELECT TOP (@max) [nodeId] FROM [dbo].[cmsContentXml] WHERE...

Xquery get value from attribute

Hi, I have some xml and need to extract values using sql <?xml version="1.0" ?> <fields> <field name="fld_AccomAttic"> <value>0</value> </field> <field name="fld_AccomBathroom"> <value>1</value> </field> </fields> </xml> I need to get column name fld_AccomAttic Value 1 The xml is held in a sql server 2005 db I ...

C# - Rollback SqlTransaction in catch block - Problem with object accessability

Hi there. I've got a problem, and all articles or examples i found seem to not care about it. I want to do some database actions in a transaction. What i want to do is very similar to most examples: using (SqlConnection Conn = new SqlConnection(_ConnectionString)) { try { Conn.Open(); SqlTransaction Trans = Conn....

How to limit the number of connections to a SQL Server server from my tomcat deployed java application?

I have an application that is deployed on tomcat on server A and sends queries to a huge variety of SQL Server databases on an server B. I am concerned that my application could overload this SQL Server database server and would like some way to preventing it making requests to connect to any database on that server if some arbitrary nu...

Creating an SQL query to list all clients, who spent over 1000$

So, I have three tables with the following rows: Customers (Customer_id and Name), Orders (Customer_id, Product_id, Quantity) and Products (Price). How do I write a query which shows all customers who spent more than 1000$? Do I have to join the tables? ...

how to join with group by statement

Im having two tables TableA Custid prodid Amt1 1 10 200 2 20 300 3 10 400 4 30 300 5 20 400 6 30 200 TableB prodid Amt2 10 100 20 200 30 300 and i want sum of all amount group by prodid. can any one give me both ansi and Tsql quries. ...

SQL Select between two fields depending on the value of one field

Hi. I am using a PostgreSQL database, and in a table representing some measurements I've two columns: measurement, and interpolated. In the first I've the observation (measurement), and in the second the interpolated value depending on nearby values. Every record with an original value has also an interpolated value. However, there are a...

Changing Database Names and Cross Database Queries In Stored Procedures

Hi, I have a number of related databases that are version-ed. Instance of different versions may run side by side, identified by their different versions, i.e. [NorhwindV1.1] and [NorhwindV1.2] may be on the same server, along with [SouthwindV1.1] and [SouthwindV1.2]. There are a number of stored procedures that make cross database q...

ERD-CLASS design

Hello guyz,i am new to daatbase and class diagram.I just get scenarios from internet and try to develop ERD and Class Diagram for them.But the following scenario has caused me some problems, and i am not sure about my design. "Whenever an employee fills leave application form, the leave application should be appeared for approval to his...

Optimize SQL databases by adding index columns

Say I have a database looking like this; Product with columns [ProductName] [Price] [Misc] [Etc] Order with columns [OrderID] [ProductName] [Quantity] [Misc] [Etc] ProductName is primary key of Product, of some string type and unique. OrderID is primary key and of some integer type, and ProductName being a foreign key. Say I change ...

SSAS deployment failed > "File system error: Error opening file"

Hi, For a few months we're developing an olap cube on SQL 2005. We deploy this cube on the local server which worked fine until a few weeks ago. From that moment we got got an error while delpoying the cube. "Error 1 File system error: Error opening file; \?\C:\Program Files\Microsoft SQL Server\MSSQL.2\OLAP\Data\SSAS_Funda.0.db\Dim B...

calculating change (over a period) for a dated field

I have two tables with the following schema: CREATE TABLE sales_data ( sales_time date NOT NULL, product_id integer NOT NULL, sales_amt double NOT NULL ); CREATE TABLE date_dimension ( id integer NOT NULL, datestamp date NOT NULL, day_part integer NOT NULL, week_part integer NOT NULL, month_part intege...

Even lighter than SQLite

I've been looking for a C++ SQL library implementation that is simple to hook in like SQLite, but faster and smaller. My projects are in games development and there's definitely a cutoff point between needing to pass the ACID test and wanting some extreme performance. I'm willing to move away from SQL string style queries, allowing it to...

Java: JPA classes, refactoring from Date to DateTime

With a table created using this SQL Create Table X ( ID varchar(4) Not Null, XDATE date ); and an entity class defined like so @Entity @Table(name = "X") public class X implements Serializable { @Id @Basic(optional = false) @Column(name = "ID", nullable = false, length = 4) private String id; @Column(name ...

SQl Pivot help with multiple tables

SQL Pivot Help: I have three tables as follows: Class Table: ID Name 1 N1 2 N2 3 N3 Flags Table: ID ClassID Flags 1 1 F1 1 1 F2 1 2 F3 1 3 F1 1 3 F3 Session Table: ID ClassID Session 1 1 S1 2 1 S2 3 1 S3 4 2 S2 5 ...