MySQL Data Sheet

C (Create): Creating

            1. Syntax:
                Create table Table (
                    Column name Data type 1,
                    column name datatype 2 2,
                    ....
                    Column Name Data Type n n
                );
                Note: The last column, no comma (,)
                 database type:
                    1. int: integer type
                          Age int,
                    2. Double: decimal type
                          Score Double (5,2)
                    3. dATE: date, contains only the date, the MM-dd-YYYY
                    4. datetime: date, time division comprising date sec yyyy-mM-dd HH: mm: ss
                    5. The timestamp: time Minutes wrong type comprising yyyy-mM-dd HH when date: mm: ss
                         If you do not assign to this field in the future, or assignment is null, the system defaults to the current time, to automatically assign

                    6. varchar: String
                          name varchar (20): name up to 20 characters
   zhangsan 8 characters seating two characters

             Create a table example:
                Create table Student (
                    ID int,
                    name VARCHAR (32),
                    Age int,
                    Score Double (4,1),
                    Birthday DATE,
                    the insert_time timestamp
                );
              replicate table:
                  Create table like table table being copied;

R (Retrieve): inquiry

             Query a database of all the table names
                 show tables;
             lookup table structure
                 desc table name;

U (Update): Modify

            1. Modify the table name
                alter table table name rename to the new name;
            2. modify character set table
                alter table table name character set character set name;
            3. Add an
                alter table table add Column Name Data Type;
            4. Modification column name type
                alter table change table column names new column not new data types;
                alter table column name table modify the new data type;
            5. remove column
                alter table drop table column name;

D (Delete): Delete

drop table 表名;
drop table if exists 表名 ;

Detailed description:

A, MySQL create a data table

Create a MySQL data tables need the following information:

Table Name
Table Field Name
The definition of each table field

grammar

The following is a table of data to create MySQL SQL general syntax: here (CREATE TABLE can be lowercase)

CREATE TABLE table_name (column_name column_type);

Create a table from the command prompt

By mysql> command window can be very simple to create MySQL data tables. You can use the SQL statement CREATE TABLE to create a data table.

Examples

The following is an example to create a student data sheet:

 create table student(
                    id int,
                    name varchar(32),
                    age int ,
                    score double(4,1),
                    birthday date,
                    insert_time timestamp
                );

Copy the table:
the table name create table table name like to be copied;

2, MySQL delete data table

Be very careful when deleting data in MySQL tables are very easy to operate, but you then delete the operating table, because the delete command all data will be lost.