auto-increment

I've already looked at other answers and I still feel that my question is relevant and deserves a separate entry. I have a table named settings(which stores user settings) and I have to insert multiple settings for each user. Initially, I had executed a separate insert statement for each setting, but having felt this wasn't a particularly good way to do it, I thought of inserting multiple rows by the same insert statement. My only problem is that I want the auto_incremented IDs of each of the newly inserted rows. I've read answers that say this isn't possible/scalable etc, but I feel that I

Is it possible to make an auto-increment function in MySQL that combines alpha elements and numeric? I have an existing system with keys like QAb99, QAb101, QAd9003, etc. The max numeric portion ranges from 1 to 9999, while the letters begin with QA and range from QAa to QAd, etc. and will eventually pass QAd9999 to QAe1, etc. Is it better to manage generating new keys in SQL or outside of SQL (i.e. php script)? thanks. I asked this a while ago. Mysql doesn't do this unfortunately. I'd love it to, but it just doesn't. In php you could do it. Example: public function random_id_gen($length) { /

Can you provide a very simple SQL example of how to create a "count" or "order" field that would auto-increment, but restart after every change in a different field? In the table below, the "Order" field would restart at "1" every time there was a change in the "Meal" field. Thanks. Meal Time Order Lunch 10:30 1 Lunch 11:00 2 Lunch 11:15 3 Dinner 4:30 1 Dinner 4:45 2 Dinner 5:00 3 Dinner 5:30 4 Instead of storing Order in the table, consider adding it to a view. You can select from the view instead of the table when you need it. The view could use row_number() to calculate the order, like:

So I have a MySQL database that I'm using with a PHP site. Over the course of weeks of development, I'm left with something like: Table: users id | name ----------- 12| Bob 34| Jen 155| John 154| Kyle Except this goes on for hundreds of records and the ids are in the thousands. I'm looking for a script I can run to re-name the keys to their lowest value (preserving their respective rows), and then reset the AUTO_INCREMENT to the next id The desired output would be: Table: users id | name ----------- 1| Bob 2| Jen 3| Kyle 4| John And ALTER TABLE users AUTO_INCREMENT = 5; (Notice Kyle and John )

I am using mysql. I have a database table with auto_increment counter set. Now because of a requirement I need to leave starting 100 ids free and move all existing records starting from 101, so current id 1 will go to 101 and id 2 will become 102 and so on. I am able to move records to 101 but the problem is that how to change auto_increment counter to max(id)+1. Main constraint here with me is that I need to do it in single sql statement. I can not save the value using @counter and use it later. I tried using below query ALTER TABLE role AUTO_INCREMENT = (SELECT rd.counter FROM (SELECT (MAX

i want to increase mongodb document number automatically using loopback. I made function in mongo function getNextSequence(name) { var ret = db.counters.findAndModify( { query: { _id: name }, update: { $inc: { seq: 1 } }, new: true } ); return ret.seq; } db.tweet.insert( { "_id" : getNextSequence("userid"), "content": "test", "date": "1", "ownerUsername": "1", "ownerId": "1" } ) It is working in mongo shell. However when I insert using loopback.js browser ( http://localhost:3000/explorer/ ), It is not working. 400 error(SytaxError) code is showing. I can not use mongo function in loopback rest