Convert MySQL to SQlite [closed]
Is it possible to convert from MySQL to SQLite with a free tool on windows?
MySQL
Trying to perform MINUS operation in MySQL
MySql does not recognise MINUS and INTERSECT, these are Oracle based operations. In MySql a user can use NOT IN as MINUS (other solutions are also there, but I liked it lot). Example:
Unknown Column In Where Clause
SQL is evaluated backwards, from right to left. So the where clause is parsed and evaluate prior to the select clause. Because of this the aliasing of u_name to user_name has not yet occurred.
SQL select only rows with max value on a column
At first glance… All you need is a GROUP BY clause with the MAX aggregate function: It’s never that simple, is it? I just noticed you need the content column as well. This is a very common question in SQL: find the whole data for the row with some max value in a column per some group identifier. I heard that … Read more
MySQL > Table doesn’t exist. But it does (or it should)
Just in case anyone still cares: I had the same issue after copying a database directory directly using command If you do this with a database that uses InnoDB tables, you will get this crazy ‘table does not exist’ error mentioned above. The issue is that you need the ib* files in the root of the MySQL datadir (e.g. ibdata1, ib_logfile0 and ib_logfile1). … Read more
Generating a random & unique 8 character string using MySQL
This problem consists of two very different sub-problems: the string must be seemingly random the string must be unique While randomness is quite easily achieved, the uniqueness without a retry loop is not. This brings us to concentrate on the uniqueness first. Non-random uniqueness can trivially be achieved with AUTO_INCREMENT. So using a uniqueness-preserving, pseudo-random … Read more
Can’t open the mysql.plugin table. Please run mysql_upgrade to create it
You probably misunderstood/skipped point 4 in your list, Initialize MySQL. It means to either copy an existing data directory there or to create a new one, see Initializing the Data Directory Manually Using mysqld . To initialize a fresh data directory, you basically (after setting your config file) just have to run either or The … Read more
Fatal error: Please read “Security” section of the manual to find out how to run mysqld as root
I’m using OS X (Yosemite) and this error happened to me when I upgraded from Mavericks to Yosemite. It was solved by using this command
How to update a record using sequelize for node?
I have not used Sequelize, but after reading its documentation, it’s obvious that you are instantiating a new object, that’s why Sequelize inserts a new record into the db. First you need to search for that record, fetch it and only after that change its properties and update it, for example:
How to find MySQL process list and to kill those processes?
Here is the solution: Login to DB; Run a command show full processlist;to get the process id with status and query itself which causes the database hanging; Select the process id and run a command KILL <pid>; to kill that process. Sometimes it is not enough to kill each process manually. So, for that we’ve to go with … Read more