Difference between revisions of "MySQL Cheat Sheet"
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====Add columnn==== | ====Add columnn==== | ||
<ref>http://www.mysqltutorial.org/mysql-add-column/</ref> | <ref>http://www.mysqltutorial.org/mysql-add-column/</ref> | ||
| − | alter table <tablename> add COLUMN hash VARCHAR(32) after <name of another column>; | + | alter table <tablename> add COLUMN hash VARCHAR(32) after <name of another column>; |
| + | ====Alter column==== | ||
| + | <ref>https://razorsql.com/features/mysql_change_column_type.html</ref> | ||
| + | alter table <table name> modify column <column name> DECIMAL(10, 2); | ||
===View users=== | ===View users=== | ||
Revision as of 14:46, 6 July 2018
Contents
General use
Alter Table
Add columnn
alter table <tablename> add COLUMN hash VARCHAR(32) after <name of another column>;
Alter column
alter table
modify column <column name> DECIMAL(10, 2);View users
select host, user, password from mysql.user;
Remove history
(this is kept in your home directory)
rm -rf ~/.mysql_history
Remove user
drop user <username>@<host>;
Remove database
drop database <databasename>;
Grant privileges
grant all on <database>.<table> to <user>@<host> identified by '<password>'; grant all on test.* to 'michael'@'172.17.0.34' identified by 'mypassword';
Show granted privileges
SHOW GRANTS FOR 'root'@'localhost';
Delete rows older than certain date
DELETE FROM `table` WHERE `column` < DATE_SUB(NOW(), INTERVAL 3 MONTH);
AWS RDS
After creating the RDS instance, download the CA public key[7].
wget https://s3.amazonaws.com/rds-downloads/rds-combined-ca-bundle.pem
At this point you can log into the instance using TLS.
mysql -u<root user> -p -h xxxxxxx.xxxxxxxxxx.us-east-2.rds.amazonaws.com --ssl-ca=rds-combined-ca-bundle.pem
Then, as you create users makes sure to require the use of TLS[8]
grant all privileges on <database>.* to '<user name>'@'%' identified by '<password>' require ssl;
- ↑ http://alvinalexander.com/blog/post/mysql/show-users-i-ve-created-in-mysql-database
- ↑ http://www.mysqltutorial.org/mysql-add-column/
- ↑ https://razorsql.com/features/mysql_change_column_type.html
- ↑ http://stackoverflow.com/questions/4561292/how-to-clear-query-cache-in-mysql
- ↑ http://dev.mysql.com/doc/refman/5.7/en/show-grants.html
- ↑ https://benperove.com/delete-mysql-rows-older-than-date/
- ↑ https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/AuroraMySQL.Security.html
- ↑ https://dev.mysql.com/doc/refman/5.7/en/alter-user.html#alter-user-tls
