pivot table sql server

One, table variables Table variables were introduced for the first time in SQL Server 2000. The specific definition of a table variable includes a column definition, a column name, a data type, and a constraint. Constraints that can be used in

First, table variablesTable variables were first introduced in SQL Server 2000. The specific definitions of table variables include column definitions, column names, data types, and constraints. Constraints that can be used in table variables include primary KEY constraints,

http://msdn.microsoft.com/zh-cn/library/dn144699.aspx IntroductionIn SQL Server, the common table-to-table inner Join,outer Join is executed by the engine based on the selected column, the data is indexed, and the selected data is selectively converted to loop Join,merge Join,hash Join one of the three physical connect

When we use a table in a database, we often encounter two ways to use the table, namely, the use of temporary tables and table variables. In practical use, how can we flexibly use them in stored procedures, although they implement the function is basically the same, how can there be time in a stored procedure to use temporary tables instead of using

The source of this article: http://www.cnblogs.com/wy123/p/7106861.html(It is not the original works right to retain the source, I my book still far to reach, just to link to the original text, because the following may exist some errors to amend or supplement, without him)Recently encountered in SQL Server several times the developer submitted the performance problem of

system requirements change, may also deliberately leave one or two alternate fields.In a table, the order of each row of data can be arbitrarily transformed, usually in the order in which the data is inserted. You can also sort the data by index, in short, the data row arrangement here does not affect the subsequent sequencing of the programming process.But the data between rows is also fine and do not repeat, this is controlled by the primary key, b

SQL Server 2005 SP2 brought us the vardecimal function. At that time, a new storage format-vardecimal was introduced for the decimail and numeric data types. The vardecimal storage format allows storage of the decimal and numeric data types as a variable length column. This feature allows the original fixed-length decimal data to be stored in a variable-length format in the data file. It is said that this f

that needs to be repairedDECLARE @dbname varchar (255)Set @dbname = ' Name of the database to be repaired 'exec sp_dboption @dbname, ' Single user ', ' true 'DBCC CHECKTABLE (' name of the data table to be repaired ', repair_allow_data_loss)DBCC CHECKTABLE (' name of the data table to be repaired ', repair_rebuild)------Change the name of the data table that nee

The temporary table is stored in tempdb,It is automatically deleted when it is no longer in use. Temporary tables can be local or global. They differ in terms of name, visibility, and availability. The name of the local temporary table starts with a single digit (#). They are only visible to the current user connection and are deleted when the user is disconnected from the

Label:The rationality of database structure and index affects the performance of database to a great extent, but with the increase of database information load, the performance of database is also greatly affected. Maybe our database has high performance at first, but with the rapid growth of data storage--such as order data--the performance of the data is also greatly affected, one obvious result is that the query response will be very slow. What else can you do at this time, in addition to opt

that needs to be repairedDECLARE @dbname varchar (255)Set @dbname = ' Name of the database entity to be repaired 'exec sp_dboption @dbname, ' Single user ', ' true 'DBCC CHECKTABLE (' name of the data table to be repaired ', repair_allow_data_loss)DBCC CHECKTABLE (' name of the data table to be repaired ', repair_rebuild)------Change the name of the data table t

partition table in SQL Server 2005 (ii): How to add, query, and modify data in a partitioned tableCategory: SQL Server2009-12-03 15:02 13848 People read Comments (3) favorite reports SQL Serverinsert2010sqlclassAfter you have created the partitioned

post 1: temporary tables are similar to permanent tables, but temporary tables are stored in tempdb and are automatically deleted when they are no longer used. temporary tables can be local or global. They differ in terms of name, visibility, and availability. The name of the local temporary table starts with a single digit (#). They are only visible to the current user connection and are deleted when the user is disconnected from the