I'm working with the following table: Employees_2 ( EmpID INT PRIMARY KEY, FirstName VARCHAR(50), LastName VARCHAR(50), Department VARCHAR(50), Salary DECIMAL(8,2), DateOfJoining DATE ); I need to create a user-defined function to determine if an employee is a 'Senior' (more than…
When the query does not meet the conditions for index coverage,if Innodb will use index condition pushdown by auto? or how to explain these two thing by simple word or example.
I have two tables Table A has two columns I need to use and Table B has numerous columns I need to Populate with common information INSERT INTO gs_object_sensors(imei) SELECT imei FROM gs_user_objects WHERE user_id = '14' The above code…
Following up on from my previous question: Get count of each email type from multiple tables I had to get clarification... So I do indeed need to have multiple tables. I then need to get a count of all the…
I have a log table with timestamped (DATETIME) rows in the millions which I occasionally need to search by date or date range. I have an index on the timestamp column at present for the purpose. However, I am wondering…
I have 15+ tables with emails. I need to count how many emails exist for each internet service provider, like GMAIL, VMG, MSFT, or Other. Using the below query, I can get a count of the ISPs for one table:…
I read some data from the database. To do this, I group the values according to the "date" and the "ustd". Can I have it count beforehand how many "ustd" it has summarized? I read the data as follows: $lbtbs…
Please check below as a concrete example. For each id, there are several time intervals. I want to count the number of overlapping intervals, which is defined as the start_time of the current interval < the end_time of ALL the…
I have a table with close to 10000 rows I want to update the first 500 rows using SQL UPDATE gs_user_objects_copy SET user_id = '269' WHERE user_id = '14' LIMIT 500 I want to change the user_id to 269 where…
I’m working on a Go project using GORM and MySQL. I need to retrieve a list of IDs from a specific entity in the database and am considering two approaches to achieve this. I’d like to know which one is…