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Recent Posts

MySQL Date Math   August 11th, 2015

SELECT DATE_SUB(CURDATE(), INTERVAL 30 DAY);
SELECT DATE_SUB(CURDATE(), INTERVAL 1 MONTH)
SELECT DATE_SUB(CURDATE(), INTERVAL 3 MONTH)
SELECT DATE_SUB(CURDATE(), INTERVAL 6 MONTH)
SELECT DATE_SUB(CURDATE(), INTERVAL 12 MONTH)
SELECT DATE_SUB(CURDATE(), INTERVAL 18 MONTH)

SELECT DATE_SUB(CURDATE(), INTERVAL 24 MONTH)
SELECT DATE_SUB(CURDATE(), INTERVAL 10 YEAR)
SELECT DATE_SUB(CURDATE(), INTERVAL 100 YEAR)

1997-11-01

SELECT COUNT( `WB1` ) FROM `PB` WHERE `WB1` =  15 and `DDate` >= DATE_SUB(CURDATE(), INTERVAL 10 MONTH)



CURDATE()
  • Returns the current date as a value in 'YYYY-MM-DD' or YYYYMMDD format, depending on whether the function is used in a string or numeric context.
    mysql> SELECT CURDATE();
            -> '2008-06-13'
    mysql> SELECT CURDATE() + 0;
            -> 20080613
Posted in MySQL | No Comments »

Open MYSQL for remote connections   August 11th, 2015

https://rtcamp.com/tutorials/mysql/remote-access/

Change mysql config

Start with editing mysql config file

vim /etc/mysql/my.cnf

Comment out following lines.

#bind-address           = 127.0.0.1
#skip-networking

If you do not find skip-networking line, add it and comment out it.

Restart mysql server.

service mysql restart

Change GRANT privilege

You may be surprised to see even after above change you are not getting remote access or getting access but not able to all databases.

By default, mysql username and password you are using is allowed to access mysql-server locally. So need to update privilege.

Run a command like below to access from all machines.

mysql> GRANT ALL PRIVILEGES ON *.* TO 'USERNAME'@'%' IDENTIFIED BY 'PASSWORD' WITH GRANT OPTION;

Run a command like below to give access from specific IP.

mysql> GRANT ALL PRIVILEGES ON *.* TO 'USERNAME'@'1.2.3.4' IDENTIFIED BY 'PASSWORD' WITH GRANT OPTION;

You can replace 1.2.3.4 with your IP. You can run above command many times to GRANT access from multiple IPs.

You can also specify a separate USERNAME & PASSWORD for remote access.

You can check final outcome by:

SELECT * from information_schema.user_privileges where grantee like "'USERNAME'%";

Finally, you may also need to run:

mysql> FLUSH PRIVILEGES;

Test Connection

From terminal/command-line:

mysql -h HOST -u USERNAME -pPASSWORD

If you get a mysql shell, don’t forget to run show databases; to check if you have right privileges from remote machines.