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Posts by Charlie Brumbaugh
Almost every table in my DB has triggers that fire on INSERT, UPDATE, DELETE and write the changes to a separate read only DB. This makes it possible to track changes and undo things well after the...
From time to time I will have large structural changes to make on my MySQL DB, things like adding columns, changing datatypes, adding indexes etc. These types of changes result in downtime and what...
If one finds where the past number of months equals the past number of days like this, select distinct DATE_SUB(now(), INTERVAL 92 DAY),DATE_SUB(now(), INTERVAL 3 MONTH) The numbers that are curre...
The select for finding tables without a specific column name is, SELECT DISTINCT table_name FROM information_schema.tables WHERE table_schema = 'DATABASE_NAME' AND table_name NOT IN( SELECT DI...
I need to add one column with the same name to all of the tables in my database, how can I find which tables don't currently have a column with that name?
I have a bunch of stored procedures that look like something this CREATE PROCEDURE example() BEGIN UPDATE STATEMENT A; UPDATE STATEMENT B; UPDATE STATEMENT C; END// When I run them thr...
On a Linux server, if you leave the .git folder unprotected in the public_html folder, its possible that someone could download the folder and then gain access to your files. There are two ways I h...
The easiest way to temporarily disable a MySQL user is to the change the value of the Host column in the mysql.user table to an invalid host. UPDATE mysql.user SET HOST = 'blocked' WHERE #your cond...
Sometimes I will need to temporarily lock out other MySQL users when I am making large structure changes and want to make sure that nobody else is inputting or changing the data. The other use case...
I would like to see questions asking for help finding resources be considered on topic, but I would suggest creating a seperate category for them, like how Photography and Outdoors have one for Gea...
Its possible to execute a MySQL file from the command line like so, mysql -u USER -pPASSWORD < FILENAME which triggers a warning, mysql: [Warning] Using a password on the command line int...
I need to rename one column in 170 tables in a MySQL database and its going really slow. The columns all have an index plus a foreign key on them, would dropping the index/temporarily removing the...
Let's say we have two tables A and B and a join table C that has foreign keys to both A and B and the combination of those foreign keys is unique. One could either do a unique constraint or a comp...
I have a database with quite a few VARCHAR fields. When the database was first built the lengths of the columns were set a bit larger than absolutely necessary. Now after, having used the DB for a ...
I am considering either removing some columns or changing the datatypes if I could significantly reduce the amount of storage that is currently used by those columns. Some of the columns are ints a...
I have a number of command line PHP scripts that are either run by a user or by Windows Task Scheduler. These scripts use DB and API credentials and I am wondering if there is a better way of stori...
Sometimes, either to reduce the amount of typing big table names or when joining a table to itself one will need to alias a table. Personally I find SQL statements with aliases harder to read and a...
I have two tables with millions of records. Every so often I need to join them and exclude just a handful of records where a bit(1) column is set to 1 instead of 0. I can do it with either, WHERE ...
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