what is fact and dimension table in data warehousing

the data, such a huge table, so that the logical backup of data, query, and even based on log table fallback has produced a huge efficiency problem. How can I quickly and efficiently delete log information from three months ago, how can I quickly retrieve information about the current month, how to make full use of

In a php file, I define two forms. when the first form is submitted, the second form is generated. after the second form is submitted, the data of the first form cannot be obtained, what should I do? Form php submit transfer data

(Mysql) how to determine whether a numeric variable is included in a table field and list all data in the table containing the variable. if the table contains the following idcsite fields .... 11,2, 13 .... nbsp; 22,3, 4 (mysql) how to determine whether a numeric variable

QQ is added, and the submitted data is not stored. what's the problem? in the recommended registration file, only the user name and password can be entered. I want to add a QQ user, however, QQ is not stored in the table. what

(that is, 4b=32b, the maximum value is 32 1 components); Next we'll talk about what the length of the field is when we build the table. CREATE TABLE ' Test ' (' ID ' INT (one) not NULL auto_increment PRIMARY KEY,' Number ' INT (5

(as a character read) in the list2, fixed format: Record data, data type, data length fixed.3, variable format: Each record has at least one variable Long data field, and a record can be a sequential string.The demarcation of the data segment (e.g., name, age) as "," as a f

transaction is opened, the deletion code can be executed and the result returned normally returns 1, but there is no response in the actual data and the data cannot be deleted. Iii. analysis of the causes of anomalies This problem occurs because roles uses the Cascadetype.refresh annotation, and roles automatically a

(Mysql) how to determine whether a numeric variable is included in a table field and list all data in the table containing the variable. if the table contains the following idcsite fields .... 11,2, 13 .... nbsp; 22,3, 4 ...., 5 ...., 23 .... 5. how does mysql determine whe

What is Data extractionData extraction refers to the data that is needed to extract the destination data source system from the source data source system. In practical application, the

time? 3: What if one read and one write at the same time? Transactions are not considered. To answer:1: There are no locks for different select statements in innodb, and Myisam will automatically add table share read locks; 2: innodb has no locks, so there is no problem. Myisam is a

(MySQL) How to tell if a numeric variable is contained in a field in a table and lists all the data in the table that contains the variable. This table contains the following fields ID csite .... 1 1,2,13 .... 2 2,3,4 .... 3 1,4,5 .... 4 2,5,23 .... 5 1,3,8 .... Suppose you

Because the user record is too much (3 million), the paging query becomes very slow, how to optimize the statement or index? Do you have any optimization plan? Supplemental content:Thank you for your proposal, I see very inspired, but the combination of my situation is more special, not very applicable. The details are as follows:1 when the user opens the participation record page, it

For example, the specific operation on a table in the title. For example, the next access will contain three operations. After the user submits data into a temporary table, a determines based on the business logic, one of the fields in update is the data processed by the 3in

What is the problem of multi-table operation comparison? Waiting online !! Delphi/Windows SDK/API Http://www.delphi2007.net/DelphiDB/html/delphi_20061216123719269.html Please help me! I have two data tables: basic data table (numb

Mysql table sharding is a key technology in Mysql databases. The concepts and usage of Mysql table sharding are described in detail below. If you are interested in this, take a look. First, we need to know why Mysql table sharding is required.

The first table shows that for all microsoftreg; SQL server #8482; 2000 versions are the sameMaximum capacity. The second and third tables describe different versions of SQL Server 2000 and the operating systemCapacity. The following table describes what is defined in the Microsoft SQL Server database, or in the Transa

Tags: color string abi amp bind column int view importThe original Published time: 2008-08-03--from my Baidu article [imported by moving tools]To read the full text, click Http://blog.csdn.net/windok2004/archive/2007/10/28/1852554.aspxWe know that as long as the GridView bound DataTable has a row of records, the GridView will display the table header, so when the DataTable is emptyWe add a blank line to dis

form, but how do the random text boxes in the form look neat, so it's usually a form that is nested in a table. See an example of the difference between a form and table: Effect everyone should be able to think of it: What is really going to be presented to the server

The tables we build in the database are real, such as the student table, and when querying one or more tables, especially the data that is displayed in a table with a visual tool is a virtual table;Because this

service mysqld start; show create table test to view the table structure information. Ii. Data Retrieval A. Create a database and execute the SQL statement to create a table based on the table created in the preceding export.B. Find the Record Point. First, discard the tabl