Question : I’m trying to get group concat of count value here table below I want this structure: | y […]
Category: MySQL
Should I repeat UNIQUE constraint on similar multi-index?
Question : The index are on tuples, ordered sets, of columns, but the UNIQUE constraint or qualifiant for an index […]
MySQL #1054 – Unknown column ‘masterdata_hyung_event.eventId’ in ‘on clause’ on deep join tables
Question : So, I have this query SELECT * FROM hyung LEFT JOIN masterdata_hyung_description ON hyung.descriptionId = masterdata_hyung_description.hyungDescriptionId CROSS JOIN […]
Best way to associate multiple records with one another
Question : What is the best database design to associate multiple rows with another another. Let’s say we have a […]
Users complain that system runs slow when mysqldump is in progress
Question : The MYSQL database (ibdata1) is of size 73 GB and is configured to run as a dedicated database […]
Data sync between two local Mysql databases in different system in same netwrok
Question : I am using mysql as database for my application and for the purpose of fail over and I […]
Why does “CREATE TABLE IF NOT EXISTS” lock a table?
Question : We recently run into “waiting for table metadata lock” issues, after “CREATE TABLE IF NOT EXISTS” has been […]
How to get interval value between two hours in mysql?
Question : I want to get value between 2 hours: 11:30:00 => 245.90 10:30:00 => 215.80 11:30:00 – 10:30:00 => […]
Why do the MySQL bin log files still exist after a purge or flush?
Question : I’ve used PURGE BINARY LOGS as well as FLUSH LOGS, but the mysql directory still contains these files: […]
mysql threads running high issue for Percona Mysql 8.0.16
Question : we are experiencing a threads running high issue mysql> show global status like ‘%buffer_pool%’ -> ; +—————————————–+————————————————–+ | […]