I have a table where I have duplicate values in just one column, and I want to remove those value using the column which has timestamp values. So the value which has latest timestamp should be in the expected result. For example, using the below table column1 is varchar, column2 is timestamp Looking at the ab…
Tag: database
how to query get value without id
I want to get the value of the column regardless of the id of the table, because I want to use GROUP BY to concatenate them from the table : id_child id_master test1 test2 test3 1 1 1 1 0 2 1 1 0 0 3 1 1 0 0 4 2 1 0 0 5 2 1 0 0
Find the average over the n last purchases, for every user in the table using SQL
I have a SQLite db with two tables: users userID field1 field2 field3 field4 1 2 3 purchases purchaseID userID price timestamp 1 2 70 5166323 2 1 30 6543654 3 1 100 5456434 4 2 30 5846541 5 2 40 9635322 6 1 50 2541541 I want to write an SQL query that returns a table userID field1 field2
Select clause result as comparison expression
In Sql queries can I use the result of a select clause using aggregate functions as an expression for a comparison? For example: Answer Yes, you can do this. You just need parentheses as you would with any subquery: Note that count(b) is not necessary when you know that b is not NULL. There is no need to chec…
Database in WPF and Windowformapps
I’m developing applications using either WPF or WindowFormApps that can store and manage database. The question is that how can i create an in-app database or which kind of database should I use that can run whenever I install it on other devices. My application cannot run on other devices since there i…
Order results by “Best Match” SQL
I’m working on a project which requires the user to search for certain categories of products. The products have tags such as: T-shirt, Jumper, hat and I am currently displaying the results ordered by the amount of likes. Here’s my SQL statement: But the issue is that if let’s say someone se…
How to transpose row to columns in Oracle as shown below using Unpivot?
Source Table Cost Category Cost Category Type Q1-2020 Q2-2020 Q3-2020 Q4-2020 Employee Impacted Period Cost 10 20 0 4000 Achieved Result Cost Category Cost Category Type Quarter Year Value Employee Impacted Period Cost Q1-2020 10 Employee Impacted Period Cost Q2-2020 20 Employee Impacted Period Cost Q3-2020 0…
MYSQL Trigger not adding count after inserting rows into another table
This is a continuation of this question: Insert data into a table with a foreign key SQL I need to create a trigger that updates a counter variable after I insert a row into a table. The counter variable keeps track of how many new rows are inserted into the ItemBook table. However, after running the script, …
Write query with HAVING clause in Kotlin with Exposed
I have written an SQL query in which I use the HAVING clause. However, I have not found practical examples of the use of HAVING in the Exhibited documentation. My query should return the following: Disputes for an order that has the most recent status of ‘CAPTURED’ or ‘EXPIRED’ My bigg…
Why this mysql statement returns whole table?
I am wondering that how this query returns all data from the table: It gives the same output of this: It is probably works as this: but, WHY? Answer Break the WHERE condition down, and this starts to make sense: All rows with an email attribute set to a blank string ” will return TRUE. For a minute, let…