How to select the nth row in a SQL database table?

I'm interested in learning some (ideally) database agnostic ways of selecting the nth row from a database table. It would also be interesting to see how this can be achieved using the native...

Database Management

I want to learn about triggers, viewer in SQL ? I also would like to learn some Advanced database management concepts ? would someone give me a clue about a Text that i can learn it individually ?

How to migrate a PostgreSQL database into a SQLServer one?

I have a PostgreSQL database that I want to move to SQL Server -- both schema and data. I am poor so I don't want to pay any money. I am also lazy, so I don't want to do very much work. Currently...

How to get generated ID after I inserted into a new data record in database using Spring JDBCTemplate?

I got a very common question when I was using Spring JDBCTemplate, I want to get the ID value after I inserted a new data record into database, this ID value will be referred to another related...

JDBC Derby driver not found

I've followed the JDBC tutorial at: http://docs.oracle.com/javase/tutorial/jdbc/basics/gettingstarted.html, and managed to build and create my own JDBC database without too much fuss. However now...

Create a Map in Golang from database Rows

Basically after doing a query I'd like to take the resulting rows and produce a []map[string]interface{}, but I do not see how to do this with the API since the Rows.Scan() function needs a...

Ideal way to store product information in shopping cart in asp.net

I am creating an ecommerce application, wherein i have a shopping cart. My current structure is, whenever user saves the product, i put the product in the datatable and datatable to the session,...

Changing the data type "varchar'' of a column to "DATE" in SQL/ORACLE

I have a table in a database created in oracle 10G. It contains a column of type 'VARCHAR' and stores date as string in this format-> 'dd-mon-yyyy' eg: '12-aug-2008'. Now I want to change the...

Adding SQL Server database to Visual Studio 2013 ASP.Net webpage

I am trying to add a SQL Server database item into my ASP.Net website. I have SQL Server 2012 installed but when I press add in Visual Studio I get the following error Connection to SQL server...

Why use a mutual has_one relationship?

Looking at the ActiveRecord has_one and has_many relations in Rails, this is probably a general (and very likely obvious) question. If I have two tables, say Husbands and Wives, and it is a...

What are ontology can do, but relational database can not?

I am new to ontology. After some study, I still do not know what is ontology advantage in application. I already know ontology can provide more meaningful querying interface than database, and...

What is the datatype bytea and when would I use it?

In Postgres there is a datatype called bytea The Postgres docs are here for it: http://www.postgresql.org/docs/9.0/static/datatype-binary.html I cannot understand when I would ever use this - nor...

Google Cloud SQL increasing size until full disk with no reason

I don't know how to explain this well, but I will try. I use Google Cloud SQL second edition with 20 GB disk size. I have several wp. databases with 166.5 MB Total size. And right now my Storage...

Database, relational query

Chemicals have a trade name (which is what it is commonly referred to as) and an actual chemical name. I need to look up a trade name, find its proper chemical name, then get properties of that...

Conditional firebase query

I have a list of instances in my Firebase database, and I want to filter the list if and only if the the user chooses to filter the query. If the user doesn't choose to filter the query I just...

Update-Database command is not working in ASP.Net Core / Entity Framework Core because object in database already exists

I was updating my database by the command line, but then I manually updated one of my tables. This seems to have disrupted my ability to update-database. I receive the following error when I try...

How to update a Previous Row data in SQL SERVER

for example Sales Table SlNo Inventorycode Cost Date 1. 100001 1.8 01/01/2017 2. 100002 2.3 01/01/2017 3. 100002 3.5 02/01/2017 4. 100001 2.5 ...

Firestore: How to get random documents in a collection

It is crucial for my application to be able to select multiple documents at random from a collection in firebase. Since there is no native function built in to Firebase (that I know of) to achieve...

Does django hits the database when you request for an object's attribute from a cached query?

I'm having trouble to understand how to properly use the Caches Framework. lets say I have this code: class Book(models.Model): title = models.CharField() author =...

Elastic Search: Parent child vs Nested Document

P.S: We are using Elastic 6.x AS Elastic Search is upgraded few breaking changes are also popped out. We have some relational data which requires to be managed either nested or parent/child...

Calculate time difference between two columns of string type in hive without changing the data type string

I am trying to calculate the time difference between two columns of a row which are of string data type. If the time difference between them is less than 2 hours then select the first column of...

mongo db (mongodb.service) failed, status 14

I am experiencing the following problem using mongodb. This is the error, when I check the status: Screenshot of the error (mongodb.service, status 14) Screenshot of code in the mongod.config...

Read from CSV file and insert into database Python

I am trying to read a CSV file and insert into a PostgreSQL database. But I want 1st and 5th column item as integer. So, I am converting 1st and 5th columns into an integer. But it is showing...

PostgreSQL with Django: should I store static JSON in a separate MongoDB database?

Context I'm making, a Django web application that depends on scrapped API data. The workflow: A) I retrieve data from external API B) Insert structured, processed data that I need in my PostgreSQL...

How to select all fields from one table that contain a substring from any row in another column

I'm trying to export a dictionary of words in sqlite made up only of words that start with, contain, or end with specific filters. If one filter was 'ment' and could be found anywhere in the word;...

how to connect obiee to postgres db?

Need to connect Postgres database to OBIEE 12c. Is there any official documentation? Is it possible not to use third-party drivers, such as from Cdata? Which driver do I need JDBC or ODBC? OBIEE...

How can I solve Postgresql SCRAM authentifcation problem?

I am getting an error after moving the project to production. The error is as follows while running with production server pg_connect(): Unable to connect to PostgreSQL server: SCRAM...

NameError: name '_mysql' is not defined after setting change to mysql

I have a running Django blog with sqlite3 db at my local machine. What I want is to convert sqlite3 db to mysql db change Django settings.py file to serve MySQL db Before I ran into the first...

MikroORM failed to connect to database lireddit on postgresql://[email protected]:5432

I've been trying to solve this bug for 5 hours but it doesn't work. :c Pls help me. Here is the ugly console error message(im not pro at formatting sry :c): P:\.Projektek\lireddit-server>yarn...

Storing layered objects in a grid

Let's say I have a canvas where there are various objects I can add in, such as a/an: Drawing Image Chart Note Table For each object I need to store the dimensions and the layer order, for...