My IT team recently activated the MySQL general log to meet regulatory requirements. However, we’ve encountered significant performance issues: After 20+ hours of activation, the general log generated over 3 million rows. Today, when my team attempted to query the…
(SELECT 1 `a`) UNION (SELECT 2 `a`) ORDER BY `a` DESC LIMIT 1 is a perfectly valid query in MySQL and as far as I can tell the same as SELECT 1 `a` UNION SELECT 2 `a` ORDER BY `a`…
I am taking my first steps in Python, and struggling to make a connection with a small MySql-database which I have created locally. My local MySql-database works, and its credentials look like this:enter image description here It works. I can…
I want to create a SQL stored procedure that checks passwords at login. This should be a very common question however I could not find an answer anywhere to my specific question, which is about data types, or perhaps something…
In contrast to CHAR, VARCHAR values are stored as a 1-byte or 2-byte length prefix plus data. The length prefix indicates the number of bytes in the value. A column uses one length byte if values require no more than…
I have created a MySql query to count the total number of a particular word from two rows by joining the two tables. Suppose I have the word "testing" and I want how many times it is coming from two…
I am running MySql v8.0 with InnoDB. I have a simple transaction that has a SELECT (not a SELECT ... FOR UPDATE) followed by an INSERT. I'm getting frequent deadlocks when many DB inserts are happening simultaneously. All inserts use…
I have a dataset that tracks user activity, and I need to identify consecutive rows where a specific condition is met. The table structure and sample data are as follows: Table: UserActivity UserID Activity Timestamp 1 Login 2023-11-01 08:00:00 1…
I want to create a column numberofimage. In which each cell in the numberofimage column will display the number of images in the addimage column format of each cell in addimage column like: [{"file":"vstorage.com/sohoa/han01//123.jpg","name":"123.jpg","type":"image/jpeg","size":239709},{"file":"storage.com/sohoa/han01//456.jpg","name":"456.png","type":"image/png","size":1030361}] I would count the number of…
I am implementing an entity-attribute-value model to store nationwide property data that will be updated daily: 130 million properties, will probably store billions of values. We also want to search this data on arbitrary attributes, hence using EAV so we…