When i am registering members with a memberId, how to check that the user id is already exists in the members table or not ? I have tried in below method. Primary key is the MemberID MemberDbController.java MemberUiController.java } Its Throws an Already Exists Alert for both Duplicate & New Entry. Answer…
Tag: sql
How does a SQL query transform the data?
I came across this question and was trying to understand how the answer given there is actually transforming the data. Input Table +———+——-+—————+ | user_id | State | …
How to write a query that gives the names of everyone who does not own a blue house?
Q. Write a query that gives the names of everyone who does not own a blue house. Here is my code: SELECT persons.name FROM persons JOIN houses ON (persons.id=houses.owner_id) WHERE houses.color<&…
MYSQL delete all rows, but the same query on select return only 3 rows
I can’t understand why the same query for select and delete have different behavior. I need to delete all rows except 5 newest rows. I know my solution for this task is no good, but my question is …
What happens when we add new records to a SQL table while the Azure Search Indexer is running
Say for example that I’ve got an Indexer running every day and it pulls down 2 million records from the SQL table every time it gets run. It takes around 30 min to finish off. During that time we keep …
When should I split my table for faster lookup?
I have a Postgres table with 500k rows that are only read (a lot, by multiple users). I was wondering if splitting the database in two by, let’s say “date of birth” of the rows, would be more …
Why Week conversion failed in SQL Server in my case?
I am trying to convert week of the date based on my criteria. My date condition: if my @date is less than 4 AM, then @date – 1, else @date declare @dates datetime set @dates = ‘2019-01-01 03:59:59’…
Reading data from a sql database with spring data fails
I’m having a database with existing tables. One of these is called AKTIVE_AUFTRAEGE with the id “AKTIVE_AUFTRAGE_ID” and the second field “ROBOTER_AUFTRAG_ID”. I want to read the data using Spring …
Transpose Rows Into Columns by Delimiter Column Name and Column Title
I’m slightly stuck on this issue and need some SQL assistance please. Iv got a hierarchy table from someone who needs help transposing it and putting them into actual columns of another table. Here is …
SQL Server : “invalid column name” error after GROUP BY on subquery
I am trying to perform the following query on a SQL Server database table with a GROUP BY on a column which results from a CASE statement done on a subquery: SELECT AVG(sales) as avg_sales, …