MYSQL Min Max Historic Values
I have a MYSQL table with this format: Insurance Date Value A 2020-01-01 2 A 2020-02-01 5 A 2020-03-01 4 A 2020-04-01 6 A 2020-05-01 8 A 2020-06-01 1 A 2020-07-01 3 A 2020-08-01 7 A 2020-09-01 9 A 2020-10-01…
replace Em Dash and En Dash to one Dash MySQL query
I found this query on GITHUB https://gist.github.com/matoakley/1092571 that converts strings into slugs, but I'm having problems when string contains EM and EN dashes, need help with this: SELECT *, LOWER(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(TRIM(name), ':', ''), ')', ''), '(', ''), ',', ''), '\', ''),…
Select random row for each category in mysql
I have a table like this ID category product 1 1 p1 2 1 p2 3 1 p3 4 1 p4 5 2 p5 6 2 p6 7 2 p7 8 3 p8 9 3 p9 10 3 p10 I…
MySQL ifNull vs isNull?
What is the basic difference between IFNULL and ISNULL in MySQL, and how can they provide an optimized solution for handling null values? I have been using an IF condition every time, but I'm looking for a more efficient approach.…
MySQL Retrieving values with intermediary table
I have the following tables: MONKEY : id name 1 John 2 Mary CHECK : id monkey_id checkdate 1 1 2023-06-02 03:00:00 2 2 2023-08-24 14:30:00 3 1 2023-06-04 14:35:00 MEASUREMENTS : id check_id length width weight 1 1 23.34…
Optimize mysql query with bit(12) field
I have a huge mysql table where each record is a trip. Now I have to add information to each trip to say in which months the trip will start. The first idea was to use a bit(12) field where…
Mysql – Group by multiple columns and add them
I have a table something like below level1 level2 level3 key A B C k1 A B C K2 A B D k2 A B E k3 A F G k4 A F null k5 A null null k6 A…
Amazon web services – Solved: MySQL PROTOCOL_CONNECTION_LOST Error with AWS CDK CustomResource, Lambda
I am using AWS CDK for defining AWS infrastructure. I have database-stack that defines RDS(MySQL) instance and have set up AWSCustomResource like below to run table-creation.sql when the Database instance is deployed for the first time. Everytime, the instance is…
Mysql – JOIN with WHERE IN subquery not recognizing WHERE (not narrowing results)
I am trying to select with a join of a table, then use where to exclude some results, like this: SELECT * FROM table1 LEFT JOIN table2 ON table1.var = table2.var WHERE table1.var IN (select var from table3 WHERE var…
Mysql – In React Js Signup form when click submit it show some Errors
Hello Mates I am currently developing a website and i have created a register and login form in my register form when i enter the registration details and click the submit button it shows an error I tried truobleshooting the…