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) ->FROM sales ->Group by year, country, product; + ------ + --------- + ------------ + ------------- + | Year | country | product | SUM (profit) | + ------ + --------- + ------------ + ------------- + | 2000 | Finland | Computer | 1500 | | 2000 | Finland | Phone | 100 | | 2000 | India | Calculator | 150 | | 2000 | India | Computer | 1200 | | 2000 | USA | Calculator | 75 | | 2000 | USA | Computer | 1500 | |

) | + ------ + --------- + ------------ + ------------- + | 2000 | Finland | Computer | 1500 | | 2000 | Finland | Phone | 100 | | 2000 | India | Calculator | 150 | | 2000 | India | Computer | 1200 | | 2000 | USA | Calculator | 75 | | 2000 | USA | Computer | 1500 | | 2001 | Finland | Phone | 10 | | 2001 | USA | Calculator | 50 | | 2001 |

column (value change), the inquiry will generate a high clustering cumulative row. For example, in the absence of ROLLUP, a yearly, country, and product-based sales table list may be as follows: mysql> SELECT year, country, product, SUM(profit) -> FROM sales -> GROUP BY year, country, product;+------+---------+------------+-------------+| year | country | product | SUM(profit) |+------+---------+------------+-------------+| 2000 | Finland | Computer | 1500 || 2000 | Finla

USA Tom M 1970-09-02 USAUse the following command to load the text file "Mytable.txt" into the mytable table: mysql> load DATA LOCAL INFILE "Mytable.txt" intotable pet;Then use the following command to see if the data has been entered into the database table: mysql> select * FROM MyTable;In this article we learned how to create a database and database table and how to add records to a database table. So how do we retrieve data from a database table?1

whether the data has been input to the database table:Mysql> select * from mytable;In the previous article, we learned how to create a database and a database table, and how to add records to a database table.How can we retrieve data from database tables?1. Retrieve Information from a database tableIn fact, we have used the Select statement to retrieve information from database tables.The select statement format is generally:Select search keyword FROM the retrieved table Where search condition

://research.microsoft.com/en-us/groups/vc/(19) Shine ML and CV Study Group; http://research.microsoft.com/en-us/groups/mlp/default.aspx(20) Research and study Forum; http://bbs.matwav.com/(21) Liuqingshan, assistant professor, Rutgers University, USA; http://www.research.rutgers.edu/~qsliu/(22) The latest information network of computer vision; http://www.cvchina.info/(23) test video download for motion detection, shadowing and tracking; http://apps.h

. How to load delimitation data 1 data that is delimited by a particular character, may be enclosed in quotation marks, which is the most common data format for the current flat file.For bound data, the most commonly used format is comma-delimited value format. With this file format, each field in the data is separated by a comma from the next field. Text strings can be enclosed in quotes so that the string itself contains commas. If the string must also contain quotes, the general convention i

|+---------------------+10, the structure of the display table:Mysql> DESCRIBE mytable;+-------------+-------------+------+-----+---------+-------+| Field | Type | Null | Key | Default | Extra |+-------------+-------------+------+-----+---------+-------+| name | varchar (20) | YES | | NULL | || sex | char (1) | YES | | NULL | || Birth | Date | YES | | NULL | || deathaddr | varchar (20) | YES | | NULL | |+-------------+-------------+------+-----+---------+-------+11. Query all data:Mysql> select

|+---------------------+10, the structure of the display table:Mysql> DESCRIBE mytable;+-------------+-------------+------+-----+---------+-------+| Field | Type | Null | Key | Default | Extra |+-------------+-------------+------+-----+---------+-------+| name | varchar (20) | YES | | NULL | || sex | char (1) | YES | | NULL | || Birth | Date | YES | | NULL | || deathaddr | varchar (20) | YES | | NULL | |+-------------+-------------+------+-----+---------+-------+11. Query All data:Mysql

://research.microsoft.com/en-us/groups/vc/ (19) Shine ML and CV Study Group; http:// Research.microsoft.com/en-us/groups/mlp/default.aspx (20) Research and study Forum; http://bbs.matwav.com/(21) Liuqingshan, assistant professor, Rutgers University, USA; http://www.research.rutgers.edu/~qsliu/(22) The latest information network of computer vision; http://www.cvchina.info/(23) test video download for motion detection, shadowing and tracking; http://app

retrieved table Where the search condition (optional)The "*" used previously indicates that all columns are selected.The following continues with the table mytable we created in the previous article:2. Query all data:Mysql> select * FROM MyTable;+----------+------+------------+----------+| name | sex | Birth | birthaddr |+----------+------+------------+--------+| Abccs|f| 1977-07-07 | China || Mary |f| 1978-12-12 | USA || Tom |m| 1970-09-02 |

C ++: BjarneStroustrupPHP: RasmusLerdorfDelphiC #: andreshejlsberg C ++: Bjarne Stroustrup PHP: Rasmus Lerdorf Delphi/C #: Anders Hejlsberg reply: because there is a lot of bearded people, whether the language can be successful depends on the designer's beard. I don't know whether young people have heard of this stalk. By the way, although the author of ruby is a Japanese, he left a big beard and took a photo after hearing that he had no beard and ruby would inevitably fail. I have more beard