RENAME TABLE  tableone TO tabletwo; 

Note : you must issue this command with an user that has the correct priviledges

To resolve this issue please read on :

At the beginning of the dump file add this : SET FOREIGN_KEY_CHECKS=0;

At the end of the dump file add this : SET FOREIGN_KEY_CHECKS=1;

• This will disable foreign key checks for the mysqldump import session only.
• This will allow the data to be imported without the error being generated.

ALTER TABLE ‘your_table’ DROP ‘my_thing’

enjoy

UPDATE movies SET timer=timer+1 WHERE movie_id=24

Note  to decrement use timer=timer-1

Enjoy

show databases;
+——————+
| Database                |
+——————+
| database1              |
| mysql                     |
| test                         |
+——————+

It will display all the databases your user has access to

Follow this howto :

mysql> show variables like ‘max%’ ;
+———————–+————+

| Variable_name | Value |

+———————–+————+

| max_allowed_packet | 1048576 |

…
mysql> set max_allowed_packet = 1500000;

Query OK, 0 rows affected (0.03 sec)
mysql> show variables like ‘max%’ ;

+———————–+————+

| Variable_name | Value |

+———————–+————+

| max_allowed_packet | 1499136 |

This will change max_allowed_packet  but do not restart mysql or the change will reset

This is a temporary trick .

1.  log in mysql

2.  issue command : use yourdatabase; 

3. issue command : drop table if exists yourtable;

The last command will delete the database if it exists , it is usefull because if it does not exist it will not output any error

update [table_name] set [field_name] = replace([field_name],’[string_to_find]‘,’[string_to_replace]‘);

To create a table you must describe the columns and their atributes. We will create a table to hold contact information with four columns: contact_id, name, email, and birthdate.
contact_id column =  integer number that is 20 decimal places long ( it is created with an INT(20) datatype).
name column holds the full name of a contact, which we  will will set be no longer than 50 characters long, so the datatype is VARCHAR(50).
birthdate will be stored as a DATE datatype.

The following SQL command will create a table called mycontact as described above:

CREATE TABLE mycontact (
contact_id INT(20),
name VARCHAR(50),
birthdate DATE,
);

From an Excel file , you need to export it as CSV ,  Remove the CSV Headers and the Excel data  from the file ,  and after that it can be inserted in MySql

Here is an example :

load data local infile ‘your.csv’ into table tblUniq
fields terminated by ‘,’
enclosed by ‘”‘
lines terminated by ‘\n’
(yourName, yourCity, yourComments)

1 . view all of the tables in the selected database :

SHOW TABLES;

2.  view all of the tables in a different database (not selected):

SHOW TABLES IN different_db;

3.  view a specific table in the selected  database :

SHOW TABLES IN newDB LIKE ‘%time’;

The above command will find all tables that end in “time”  from the database newDB

mysqldump -u [username] -p [database_name] > /path/to/file.sql 

example

mysqldump -u mario  -p marioDB > /tmp/marioDB.sql

Sometimes you may have to recover the MySQL root password because it was either forgotten or misplaced. The steps you need are:

1) Stop MySQL

[root@bigboy tmp]# service mysqld stop

Stopping MySQL:  [  OK  ]

[root@bigboy tmp]#

2) Start MySQL in Safe mode with the mysqld_safe command and tell it not to read the grant tables with all the MySQL database passwords.

[root@bigboy tmp]# mysqld_safe --skip-grant-tables --skip-networking &

[1] 13007

[root@bigboy tmp]# Starting mysqld daemon with databases from /var/lib/mysql

[root@bigboy tmp]#

Note: In Fedora Core 3 and earlier the mysqld_safe command was named safe_mysqld and the general procedure for password recovery was different.

3) MySQL is now running without password protection. You now have to use the familiar mysql -u root command to get the mysql> command prompt. ( -p flag is not required) As expected, you will not be prompted for a password.

[root@bigboy tmp]# mysql -u root

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 1 to server version: 4.1.16

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql>

4) You will now have to use the mysql database which contains the passwords for all the databases on your system and modify the root password. In this case we are setting it to ack33nsaltf1sh.

mysql> use mysql;

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

Database changed

mysql> UPDATE user SET Password=PASSWORD("ack33nsaltf1sh") WHERE User="root";

Query OK, 1 row affected (0.00 sec)

Rows matched: 2  Changed: 1  Warnings: 0

mysql>

5) Exit MySQL and restart the mysqld daemon.

mysql> exit

Bye

[root@bigboy tmp]# service mysqld restart

STOPPING server from pid file /var/run/mysqld/mysqld.pid

051224 17:24:56  mysqld ended

Stopping MySQL:  [  OK  ]

Starting MySQL:  [  OK  ]

[1]+  Done                    mysqld_safe --skip-grant-tables --skip-networking

[root@bigboy tmp]#

The MySQL root user will now be able to manage MySQL using this new password.

Example :

Generate a list of links in HTML from a table ‘mylinks’ with the columns ‘urls’ (http://www.ossmall.info) with ‘title’ (Open Software Solutions)

The output will look like this :

<a href=”http://www.ossmall.info”>Open Software Solutions</a><br />

To do this you must use a select statement like:

SELECT CONCAT(‘<a href=”‘, urls, ‘”>’, title, ‘</a><br />’) FROM mylinks;