group by name

The table has three columns: stunamem and subject score.Table data includes:Zhang San Language 0Li Si Language 4Wang 'er English 90Zhang San, mathematics 333The query results are as follows:Chinese and English mathematics for studentsZhang San 0 0 33

Normal row-column conversion (version 1.0) only provides static and dynamic writing for SQL Server 2000, and Version 2.0 adds SQL Server 2005 writing. Question: Suppose there is a student orders table (TB) as follows: Name course score Zhang

Normal row-column conversion (version 1.0) only provides static and dynamic writing for SQL Server 2000, and Version 2.0 adds SQL Server 2005 writing. Question: Suppose there is a student orders table (TB) as follows: Name course score Zhang

In the following table, take the row with the largest field.Field a field cSP000016964 5 20SP000016964 7 30SP000016964 1 15SP000017755 4 16SP000017755 8 12The following result is obtained.SP000016964 7 30SP000017755 8 12 The code is as follows:Copy

Mysql> Select COUNT (*) as Count , name,sum (age) as the age of T1 group by name order by Count desc;+-------+--------+- -----+| Count | Name | Age |+-------+--------+------+| 3 | Atest | | | 2 | Btest | Panax Notoginseng | | 2

Reading directory I. Preface Ii. First Thought Iii. Second Thought 4. The third thought I. Preface In some of our projects, we often encounter the problem of converting rows into columns. Now let's discuss how we can convert Table 1 to

Question: Suppose there is a student score table (TB) as follows: Name Course Score John Language 74 John Math 83 John Physics 93 Dick Language 74 Dick Math 84 Dick Physics 94 Want to become (get the following results): Name Chinese mathematics

One or more rows into a column (and separated by ",")Table Name: ATable data:Desired Query Results:Query statement:Select Name, value = (STUFF (select ', ' + value from A WHERE name = Test.name

Demo and introduction of common operation methods under MySQL database commands ~, Mysql database Mysql database To install mysql, go to the Baidu tutorial. Start DatabaseThe password set by mysql-u root-p under cmdCommandShow databases; view the

1. Query duplicate records based on a single field (name) in the tableSELECT * FROM user WHERE name IN (SELECT name FROM user group by name having count (name)> 1 );2. Delete duplicate records based on a single field (name) in the table. Only

1. During the interview, I encountered a problem. I wrote a table with two fields, ID and name, to query all the data with duplicate names. The column is: Select * from Xi A where (A. username) in (select username from Xi Group by username having

The SQL statement I used: Delete from fp_sgfpxxWhere fphm in (select fphm from fp_sgfpxx group by fphm having count (fphm)> 1)And rowid not in (select min (rowid) from fp_sgfpxx group by fphm having count (fphm)> 1) Delete duplicate invoice

Normal row-column conversion (version 1.0) only provides static and dynamic writing for SQL server 2000, and version 2.0 adds SQL server 2005 writing. Question: Suppose there is a student orders table (tb) as follows: Name course score Zhang San

Question: Suppose there is a student orders table (TB) as follows: Name course score Zhang San Language 74 James math 83 Zhang San physical 93 Li Si language 74 Li Si mathematics 84 Li Si physical 94 (The following result is displayed ): Name,

Mysql searches for the list of duplicate names with the largest age mysql> select count(*) as count ,name,sum(age) as age from t1 group by name order by count desc;+-------+--------+------+| count | name | age |+-------+--------+------+| 3 |

A, SQL and sequelize in the group query grouping queries in 1.1 sql In SQL query, the wildcard GROUP BY name implements a grouped query. GROUP BYclauses are used in conjunction with aggregate functions to complete a grouped query, and in a SELECT

Source of the article: Understanding Group BY and aggregate functions Let's take a look at table 1, the table named test: Table 1 Execute the following SQL statement: 1 2 SELECT name from test GROUP by name You should

In the process of preparing a database interview, first on the Internet a sea search, to find the history of interview questions, and then a bone a bone after the gnawing, now basically these problems (or called practice) are no problem. The

SQL Code /* Title: Normal row and column conversion (version 2.0) Author: Aixinjueluo Yu Hua (18 Years wind and rain, keep the iceberg Snow lotus blossom) Time: 2008-03-09 location: Guangdong Shenzhen: General row and column conversion (version 1.0)

Reprint Http://hi.baidu.com/my_favourate/item/3716b0cbe125f312505058ebSQL query multiple non-repeating record values brief analysis 2008-02-28 11:36 below test under Oracle 10gBecause of the design needs, need to query the record value of the same