Using Multiple Active Result Sets (MARS) SQL Server 2005 introduced support for multiple active result sets (MARS) in applications accessing the Database Engine.
In earlier versions of SQL Server, database applications could not maintain multiple active statements on a connection. When using SQL Server default result sets, the application had to process or cancel all result sets from one batch before it could execute any other batch on that connection. SQL Server 2005 introduced a new connection attribute that allows applications to have more than one pending request per connection, and in particular, to have more than one active default result set per connection. MARS simplifies application design with the following new capabilities: SQL Server Express Edition. Things you can do Build web and mobile applications for multiple data types Support structured and unstructured data while storing business data with native support for relational data, XML, and spatial data.
Add geographical information to business applications and build location-aware applications. Increase granularity of temporal data with date and time data types. Easily manage SQL Server instances. Tibor Karaszi's SQL Server pages. Overview The purpose of this article is to explain how the datetime types work in SQL Server, including common pitfalls and general recommendations.
Thanks to SQL Server MVP Frank Kalis, this article is translated to German. There is also a Russian version, thanks to Evgeny Vinchyk from Ukraine, available as a word document. Acknowledgements I like to thank the following persons who provided valuable suggestions and input for this article: Steve Kass, Aaron Bertrand, Jacco Schalkwijk, Klaus Oberdalhoff, Hugo Kornelis, Dan Guzman and Erland Sommarskog. Sql server - SQL Service Broker and .NET Windows Service - Best practices. Sql - Tinyint vs Bit. Accessing Data with ADO. For performance and reliability reasons, it is strongly recommended that you use a client-server database engine for the deployment of data driven Web applications that require high-demand access from more than approximately 10 concurrent users.
Although ADO works with any OLE DB compliant data source, it has been extensively tested and is designed to work with client server databases such as SQL Server. ASP supports shared file databases (Access or FoxPro) as valid data sources. Although some ASP example code use a shared file database, it is recommended that these types of database engines be used only for development purposes or limited deployment scenarios. Peter DeBetta's SQL Programming Blog : T-SQL UrlEncode. I was perusing the newsgroups when I came across a request in the microsoft.public.sqlserver.clr newsgroup to see if there was a way to use System.Web.HttpUtility.UrlEncode in T-SQL.
I know using the CLR is an option, but I decided to write a T-SQL equivalent. I reflected the code to figure out the exact rules for UrlEncoding. Then, I discovered much to my delight, a new system function in SQL Server 2005 that converts a string to its hexadecimal equivalent as a string– sys.fn_varbintohexstr. The curse and blessings of dynamic SQL. An SQL text by Erland Sommarskog, SQL Server MVP.
Latest revision: 2011-06-23. An earlier version of this article is also available in German. Translations provided by SQL Server MVP Frank Kalis. SSMS Tools Pack Features. How to export data from SQL Server 2008.2010 in DML (SQL script) Query - How to read a Text file using T-SQL. Sql server - T-SQL: Opposite to string concatenation - how to split string into multiple records. Peter DeBetta's SQL Programming Blog : T-SQL UrlDecode.
INSERT (Transact-SQL) WITH <common_table_expression> Specifies the temporary named result set, also known as common table expression, defined within the scope of the INSERT statement.
The result set is derived from a SELECT statement. For more information, see WITH common_table_expression (Transact-SQL). TOP (expression) [ PERCENT ] SELECT @local_variable (Transact-SQL) Specifies that the specified local variable that is created by using DECLARE @local_variable should be set to the specified expression.
For assigning variables, we recommend that you use SET @local_variable instead of SELECT @local_variable. For more information, see SET @local_variable. Transact-SQL Syntax Conventions. Storing Variable Values in Temporary Array or Temporary List. SQL Server does not support arrays or a dynamic length storage mechanism like list.
Absolutely there are some clever workarounds and few extra-ordinary solutions but everybody can;t come up with such solution. Additionally, sometime the requirements are very simple that doing extraordinary coding is not required. Here is the simple case. Declare a variable list in SQL Server stored procedure. Database Programming: TOP Without ORDER BY? - Ward Pond's SQL Server blog. Egad, a technical post!
And after I'd already said goodbye for the month. A long time ago, a friend taught me that expectations are small murders. What does that make plans? Slow in the Application, Fast in SSMS? An SQL text by Erland Sommarskog, SQL Server MVP. Last revision: 2013-08-30. This article is also available in Russian, translated by Dima Piliugin.
Development content from SQL Server Pro. New in SQL Server 2008 is support for large user-defined types (UDTs). We’re going to build a Common Language Runtime (CLR) UDT that allows us to store, compress, and decompress binary data (up to 2GB in size) inside SQL Server 2008. This technique works only in SQL Server 2008 because only SQL Server 2008 allows CLR UDTs larger than 8KB. The UDT we’ll build, called VarBinaryComp, accepts both uncompressed data (which it will compress before storing) and compressed data as input. It also has properties to determine the length of the compressed and uncompressed data. MD5 Hash SQL Server Extended Stored Procedure.
Fix : Error 1205 : Transaction (Process ID) was deadlocked on resources with another process and has been chosen as the deadlock victim. Rerun the transaction. Fix : Error 1205 : Transaction (Process ID) was deadlocked on resources with another process and has been chosen as the deadlock victim. Rerun the transaction. Deadlock occurs when two users have locks on separate objects and each user wants a lock on the other’s object.
When this happens, SQL Server ends the deadlock by automatically choosing one and aborting the process, allowing the other process to continue. The aborted transaction is rolled back and an error message is sent to the user of the aborted process. DB2 Universal Database. Sql server - 900 byte index size limit in character length. SQL Server CREATE TABLE syntax diagrams. Sql - Are there any disadvantages to always using nvarchar(MAX) Maximum Capacity Specifications for SQL Server. The following table specifies the maximum sizes and numbers of various objects defined in SQL Server databases or referenced in Transact-SQL statements. 1Network Packet Size is the size of the tabular data stream (TDS) packets used to communicate between applications and the relational Database Engine.
The default packet size is 4 KB, and is controlled by the network packet size configuration option. 2The maximum number of bytes in any index key cannot exceed 900 in SQL Server. You can define a key using variable-length columns whose maximum sizes add up to more than 900, provided no row is ever inserted with more than 900 bytes of data in those columns. In SQL Server, you can include nonkey columns in a nonclustered index to avoid the maximum index key size of 900 bytes. Data Access content from SQL Server Pro. Defining indexes on sort columns can yield dramatic performance results The right index can dramatically improve SQL Server's sort performance. Defining a clustered index on a sort column, for example, forces the database to store data in sorted order, letting you retrieve data without additional sorting.
Note that SQL Server 7.0 and earlier releases let you create indexes only in ascending order, so if your query requires data in descending order, you'll probably have to perform additional sorting and use internal worktables to get data in the right order. However, SQL Server 2000 lets you create indexes in ascending or descending order. SQL Server 7.0 performs a sort operation when you use the ORDER BY clause. Clustered Index and Non-Clustered Index in SQL Server. Immediate deadlock notifications without changing existing code. SQL String User Function Workbench: part 2. TSQL String Array Workbench. SQL Server Backup, Integrity Check, Index and Statistics Maintenance. SourceForge.net: SQL-Viewer - Project Web Hosting - Open Source Software. SourceForge.net: Remote MySQL Viewer - Project Web Hosting - Open Source Software. BasicQuery SourceForge Project Homepage. T-SQL Developer project home page.
How To Set the SQL Server Network Library in an ADO Connection String. Aaron Bertrand : Bad habits to kick : choosing the wrong data type. Chastised for recommending use of bit data type. SQL Fiddle. CONQUEST SOFTWARE SOLUTIONS - Tools for Oracle development, database administration, SQL and PL/SQL formatting, analysis and flowcharting, oracle development tools, pl/sql gui, plsql ide, pl/sql tools, pl/sql ide, pl/sql environment, pl/sql development, p. SQL Developers - Mimer SQL-2003 Validator. Subqueries with NOT EXISTS. Sys.objects (Transact-SQL) Meta Data Functions. IF...ELSE. Sql server - How do you perform an IF...THEN in an SQL SELECT. CAST and CONVERT. Sql server 2000 - SQL2000 safely cast a VARCHAR(256) to INT. Datetime (Transact-SQL) Int, bigint, smallint, and tinyint. Decimal and numeric.
Float and real. Data Types. Ntext, text, and image.