There are a number of partitioning questions out here and a lot of the time people caution that it often does not help performance. I want to see if my use case is one of the few that does and also clarify something. In my use case, every user is going to be assigned to a bucket. Every user in
Tag: mysql
Group rows by the same value in the field, while matching on partial value only
I have a table that has many rows (between a few 1000s to a few million). I need my query to do the following: group results by the same part of the value in the field; order by the biggest group first. The table has mostly values that have only some part are similar (and i.e. suffix would be different).
Trying to make a new table by pulling data from two tables and keep getting ‘Error: Every derived table must have its own alias’ on this query
I have an ‘Orders’ table and a ‘Records’ table. Orders table has the following columns: Records table has the following columns: I’m trying to pull and compile the following list of data but I keep getting an error message: Here’s my query: What am I doing wrong? Answer The…
Major bug in MySQL 8.x? — foreign keys
While retrieving foreign keys information from MySQL (for a code generator) I noticed this strange behavior. It looks like a major bug in MySQL 8.x. When I create a foreign key using REFERENCES the …
MySQL require a minimum length
I’m using MySQL Workbench and I made a table called ‘organizations’ and want to block any try of adding a value to a column with less than 5 letters. The column name is ‘namee’. I made this, but I get an error: Error: Answer Based on the error message you shared, you apparently t…
tweetImage not showing an image
Here is my line 51, Here is my code. When I execute it I GET THIS When i replace ‘tweetImage’ with ‘profileImage’in line 51.My profileImage successfully gets uploaded in place of blank thumbnail.I want the tweetImage uploaded by the user to be uploaded in place of the blank thumbnail.I…
Column UID missing in custom TYPO3 v10 extension
While updating my TYPO3 project from v7 to v10, I encountered some difficulties with my custom extensions. Due to that I just tried to rebuild the demo extension from the official TYPO3 website: https://docs.typo3.org/m/typo3/book-extbasefluid/10.4/en-us/4-FirstExtension/2-create-folder-structure-and-configur…
Combining sql queries together
I am trying to simplify my current query code. Is there a simpler way of combining both queries into one? Here is what I have tried so far. Although it seems really messy and clunky. This query …
Get Ids of rows that has duplicates in a column
I have the following table users id | phone ————– 1 | +1111 2 | +2222 3 | +3333 4 | +4444 5 | +1111 I need to get all ids, where users have duplicate phone. For …
SQL Searching not working form a particular starting element only ‘a’ and ‘e’
This is my code SELECT * FROM `contacts` WHERE name = ‘a%’ AND name = ‘e%’; but I’m getting error so, how to display records in the table which is starting from a and e? This is my error:- #1064 – …