sql server auto increment

. (Mainly refers to transaction replication) if there is no primary key for the data table, add a field name called ID, type: int type, marked as auto-increment 1 field. 3. The publisher, distributor, and subscription server must use the computer name to register the sqlserver server. The servers registered in the ente

Http://blog.csdn.net/xys_777/archive/2010/06/22/5685953.aspx Summary of Row-to-column conversion problems-1. Row-to-column conversion (various problems in the forum will be sorted out later) --- 1. Simplest row-to-column Conversion/* Question: Suppose there is a student orders table (TB) as follows:Name course scoreZhang San Language 74James math 83Zhang San physical 93Li Si language 74Li Si mathematics 84Li Si physical 94 (The following result is displayed ):Name, Chinese, Mathematics, PhysicsL

SQL Server parses xml to Oracle and SQL Server Oracle Write a program: Read a table in SQLserver Based on the status bit and download the value of one of the fields. The value is of the XML type, insert the content of the XML file to another Oracle database, and update the table flag, indicating that this record has be

Tags: application span version orm BSP Method--Decimal Propedefinition of identity column and features the identity column in SQL Server is also called the identifier column, which is also called self-increment. This type of column has the following three characteristics:1, the data type of the column is a numeric type without decimals2, the value of the column i

frequently (by the way, it becomes a clustered index), and can better meet most of our needs. The auto-increment ID column is omnipotent. The Int type only occupies 4 bytes to fully meet the requirements of narrow indexes. The absolute sequential storage can effectively reduce index fragmentation, which fully conforms to our table habits, it is always correct to use an

');--Find Index Select CharIndex (' o ', ' Hello World ', 6);--Find Index Select QuoteName (' Abc[]def '), QuoteName (' 123]45 '); --Exact numbers Select STR (123.456, 2), str (123.456, 3), str (123.456, 4); Select STR (123.456, 9, 2), str (123.456, 9, 3), str (123.456, 6, 1), str (123.456, 9, 6); Select difference (' Hello ', ' HelloWorld ');--compare strings the same Select difference (' Hello ', ' world '); Select difference (' Hello ', ' Llo '); Select difference (' Hello ', ' hel '); Selec

emule resources can also be downloaded with thunder The following is a list of files that are shared by users, and you can download them by clicking on them after you install emule [0 Basic science sql.server.2005. E-Tutorials/cd].0sql with books. Server.2005.iso Details 12.2MB [0 sql.server.2005 of basic science. E-Tutorials/books CD].0sql.server2005dianzijiaocheng.rar Details 52.3MB

query on different physical disks, so that you can use parallel disk I/O when searching data.　 When a system uses a large number of raid and many disks, the last two suggestions are not necessarily applicable. If you have many disks, try to distribute indexes and data tables to different disks to use the most parallel disk I/O.Automatic File Growth　SQL Server allows automatic file growth as needed. When cr

Direct access tool-database utility-Upgrade Wizard database to the past is no problem.NOTE 2:1. Because SQL2000 does not contain "auto number", all fields you set with "auto number" will become non-empty fields, which must be manually modified, then, select "yes" for his "label", set the seed to "1", and increment to "1 ".2. After access is converted to

unexpected data damage. The other two functions can be reserved for special situations. When you need to use these two functions, we recommend that you record their usage and test them. TIPS: SQL Server determines that the table has an ID column If exists (select * From syscolumns where id = object_id (N 'test1') and columnproperty (ID, name, 'isidentity ') = 1)Print n 'with

Tags: Modify engine dirty read allow reply tab query Optimization solution SQL queryWhy do I need a lockIn any multiuser database, there must be a consistent set of rules for data modification, and when two different processes attempt to modify the same data at the same time, the database management system (DBMS) is responsible for resolving potential conflicts between them. Any relational database must support the ACID properties of a transaction, so

Summary of Row-to-column conversion problems-1. Row-to-column conversion (various problems in the forum will be sorted out later) --- 1. Simplest row-to-column Conversion/* Question: Suppose there is a student orders table (TB) as follows:Name course scoreZhang San Language 74James math 83Zhang San physical 93Li Si language 74Li Si mathematics 84Li Si physical 94 (The following result is displayed ):Name, Chinese, Mathematics, PhysicsLi Si 74 84 94Zhang San 74 83 93*/-- TestingIf object_id ('[TB

Summary of Row-to-column conversion problems-1. Row-to-column conversion (various problems in the forum will be sorted out later) --- 1. Simplest row-to-column Conversion/* Question: Suppose there is a student orders table (TB) as follows:Name course scoreZhang San Language 74James math 83Zhang San physical 93Li Si language 74Li Si mathematics 84Li Si physical 94 (The following result is displayed ):Name, Chinese, Mathematics, PhysicsLi Si 74 84 94Zhang San 74 83 93*/-- TestingIf object_id ('[TB

Label:Navicat for SQL Server is a comprehensive graphical management database that allows you to create, edit, and delete all database objects, such as tables, views, functions, indexes, and triggers, or run SQL queries and scripts, Navicat for SQL The Server is a full-fledg

supports enum, and set type, SQL Server does not support2 MySQL does not support nchar,nvarchar,ntext type3 MySQL increment statement is auto_increment, and MSSQL is identity (a)4 MS SQL Default the default value for table creation statements is ((0)), while in MySQL it is not allowed with two brackets5 MySQL needs to

file, using the. ldf extension. In fact, there are FileStream data files and Full-text data files for special functions.When you create a database file, each file has 5 properties that you can specify: Logical FileName: Logical file name Physical FileName: Physical file name Initial Size: Initial sizes Maximum Size: Maximum sizes Growth Increment: Growth increment CREATE

fields that are not available. 15, try to avoid using cursors, because cursors are inefficient, if the cursor operation of more than 10,000 rows of data, then consider rewriting. 16, try to avoid large transaction operation, improve the system concurrency ability. 17, the use of SET rowcount to achieve high-performance paging. Declare @ID int Declare @MoveRecords int [email protected] and @pagesize are incoming parameters Set @[email protected] * @ Pagesize+1 --The following two lines

key of the table, the first condition is that it must be unique in the table. In addition, you can create an auto-increment column for the SQL Server database based on its own characteristics: Create TABLE T_PK_DEMO(U_ID bigint not null identity (1, 1 ),-Unique ID of the recordCOL_OTHER VARchar (20) not n

. Example:foreignkey (id_p) referencespersons (id_p) */ The/*check constraint is used to limit the range of values in a column. If a CHECK constraint is defined on a single column, the column only allows a specific value. If a CHECK constraint is defined on a table, the constraint restricts the value in a particular column. Example:id_pintnotnullcheck (id_p>0), *//*default constraint is used to insert a default value into a column. If no other value is specified, the default value is added to a

parameters to use the same pre-compiled SQL statement. We will look at the execution process of the insert statement from each step of the execution plan. Note that the execution plan of SQL server should be viewed from right to left. 1. Constant scanning is used to generate a row based on constants in the SQL stat