Introduction to creating tables and grouping queries in MySQL

The following together to understand MySQL create tables and group queries, I believe we will certainly benefit a lot after reading, the text is not more refined, I hope MySQL create tables and group queries this short content is what you want.

1. create tables

create table score(

id int,

player varchar(20),

position varchar(20),

score float

);

insert into score values(1,'Harden',' guard', 30.0),(2,'Durant','vanguard', 29.1),(3,' James','vanguard', 28.3),(4,'Anthony Davies','vanguard', 27.8),(5,' Lillard','guard', 27.2);

2. Grouping

SELECT Field Name 1,......

FROM table name

GROUP BY Field Name 1... [HAVING conditional expression]

(2) Categorize player positions and display the total score for each position

select position,sum(score) from score group by position;

(3)Find players with scores greater than 29

select player,sum(score) from score group by player having sum(score)>29.0;

After grouping, you can't use where filter to use having, having to use function

(4)Query player scores greater than 27 and less than 30

select player,sum(score) from score where score>27 group by player having sum(score)< 30;

2. Limit the number of query results using LIMIT

SELECT Field Name 1...... FROM table name LIMIT [OFFSET] Number of records

select from score limit 4;

select from score limit 3,2;

3. alias a table

SELECT * FROM table name [AS] alias;

4. function list

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