1, mysql create a data table
Create a mysql table data requires the following information: name of the table, the table field name, define each table field
语法：create table table_name (column_name,column_type);
For example:
create table if not exist `runoob_tb1`(
`runoob_id` int unsigned auto_increment,
`runoob_title` varchar(100) not null,
`sunmission_date` data,
primary key (`runoob_id`)
) engine=InnoDB default charset=utf8;
Resolution:
Non-empty field: nut null
auto_increment attributes defined as increment, typically for the primary key, the value will be automatically increased by 1
keyword is used to define the primary key columns of the primary key may be used to define a multi-column primary keys, columns separated by commas
engine setting storage engine, charset set encoding
2, create a table from the command prompt
mysql -u root -p
user runoob;
mysql> CREATE TABLE runoob_tbl(
-> runoob_id INT NOT NULL AUTO_INCREMENT,
-> runoob_title VARCHAR(100) NOT NULL,
-> runoob_author VARCHAR(40) NOT NULL,
-> submission_date DATE,
-> PRIMARY KEY ( runoob_id )
-> )ENGINE=InnoDB DEFAULT CHARSET=utf8;
Query OK, 0 rows affected (0.16 sec)
Note: MySQL command terminator is the semicolon ;.
Note: -> is a newline identity, do not copy.
3, mysql delete data table
drop table runoob_tb1;
4, mysql insert data
INSERT INTO table_name ( field1, field2,...fieldN ) VALUES ( value1, value2,...valueN );
5, mysql query data
select * from table_name;
6, mysql where words
7, mysql update update
update table_name set field1='value1' ,field2='value2' where field3='value3';
8, mysql delete statement
delete from table_name where ;
9, mysql like words
select *from table_name where field1 like 'aa%';
10 、mysql union
UNION statement: display data for the different tables out of the same column of the query; (duplicate data not included)
UNION ALL statement: display data for the different tables out of the same column of the query; (including duplicates)
Use the form below:
SELECT column names FROM table name UNION SELECT column names FROM table name where condition ORDER BY column name;
SELECT column names FROM table name UNION ALL SELECT column names FROM table name for condition Condition WHERE the ORDER BY column name;
11, mysql sorting
order by
12, mysql grouping
group by
13, mysql connection using
INNER JOIN (the connection, or equivalent connection): Get Records matching fields in the relationship between two tables.
LEFT JOIN (left connection): Get the left table all records, even if no record corresponding to the right table matching.
RIGHT JOIN (Right link): a LEFT JOIN contrast, all records in the table for acquiring the right, the left table even if there is no corresponding matching records.
14, mysql null value processing
IS NULL: When the value of the column is NULL, the operator returns true
IS NOT NULL: column when the value is not NULL, the operator returns true
<=>: comparison operators (= different from the operator), returns true when comparing the two values are equal or are NULL