Structured Query Language (SQL) is a language for managing data in relational database management systems. This tag is for general SQL programming questions; it is not for Microsoft SQL Server (for this, use the sql-server tag), nor does it refer to specific dialects of SQL on its own.

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13 views

How to track unread messages for a user in a multi-channel chat application

I'm building an multi room chat application similar to gitter/slack as a side-project. The database schema i have so far is: user table (userid,username) chatRoom table (roomname etc) user-chatroom (...
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1answer
49 views

Sql vs nosql important data

In one of youtubes videos about scalling web sites I found the statement that, however, in term of scallability, noSql is easier and more flexible, though it is better to use SQL for data important ...
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2answers
186 views

Why use using-statements when you want to reopen connections? [on hold]

In a Winforms project I've been working on recently, I've been dutifully using using-statements for objects that implement IDisposable. I want to reopen a database connection, however because the ...
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2answers
30 views

'first_name' vs 'name_first' for Grouping Similar SQL Columns

When creating a table with similar bits or data such as names. Is it preferred to have the column name prefixed with a common value? Consider a table to store user information. Looking at the columns ...
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7answers
195 views

Is it unnecessary to learn the kind of data structures and objects inside sql only because we are using another language to access db indirectly?

Suppose we are using java or python to access the database. Then is it considered a wastage of time and unnecessary to learn the kind of data structures and objects being used inside sql? Please ...
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0answers
39 views

How to connect user input in HTML with an SQL database? [closed]

I'm creating an e-commerce site where I need users to log in with a username and password, and also add stuff like credit card information and address. How can I take the user input in HTML and ...
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1answer
69 views

What's the best way to popullate a new row in a database?

Is it possible to add a new row to a database using DataSet, because when I created a new dataSet and dragged the table from the database I could see that in the dataSet methods there was one called ...
2
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2answers
156 views

Is there some rationale behind SQL's lack of closure for what are standard operations in imperative languages?

Is there some historical or practical reason why SQL (or more specifically T-SQL in my case) does not support the closure property in many areas where many other language families like C do? (That is,...
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2answers
106 views

How To Design Time Slot Based App

I have got a responsibility of designing an app which allocates time slots for doctors booking. The scenario is like, there'll be entry for doctors and their time slot for each days. For E.g. ...
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1answer
35 views

sql - How do I add child of child when dependent on parent

I'm building a wpf application which interacts with a sql database. I'm confused about adding children of children in my window. For example.. I just created a fishing trip so my fishing trip doesnt ...
0
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1answer
34 views

User, user Role and user Info, data base design problem

I am creating an application that will manage job interviews and help the employers to choose the job seekers based on a ranking system that's based on some user info. I've created a database that has ...
6
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2answers
107 views

Seeking benefits of both SQL and binary files in a data storage scheme

I'm looking for some input on how to keep certain benefits of both a binary file and a SQL database in an interesting data storage problem. I have a legacy custom binary file format that is ...
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0answers
36 views

TVP or cursor? What is better for performance? [duplicate]

I am populating a cursor with a max of 65 inserts, all for a single input variable for a sp. In terms of performance, should I use a table-valued parameter instead? I use them both, but I just would ...
3
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1answer
56 views

Creating a service to to run logic / queries and update a table vs. running logic / queries on client refreshes

I'm not sure if this is a thing. I'm sorry about the ambiguous title--I wasn't really sure how to explain it. Basically I have a ASP.NET web page that runs two SQL queries and does some logic to ...
2
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2answers
46 views

When do I prefer a local DB over serialization for local data storage?

I recently started developing a small calendar application, in which I can add and view several calendar entries, which contain several data like name, date, alarm settings and so on. Those values ...
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2answers
63 views

SQL query - split and run parallely?

I have a master table T1 which has 1000 records and a ColRef a key column. There are lots other tables all linked by ColRef. I have a Stored procedure which takes few hours to process. I want to ...
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1answer
85 views

How to setup multiple queries with slight differences

I'm writing a page that will show the user statistical data about some of our products. Basically the user can get results between a specific time frame, and also add on other data to lookup by. For ...
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1answer
33 views

Dynamic form builder with serialised sql storage

I have a requirement whereby my users will need to be able to build their own forms. Which they can specify different datatypes: Text DateTime Checkboxes All customisable mandatory/optional. I've ...
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1answer
33 views

Get database after sql crash [closed]

One of the hard drive in my office's NT server was crashed two weeks ago. I had installed MS-SQL in c: and the data was stored in d:. The hard crased was c:. Thus I replaced the crashed hard drive ...
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2answers
52 views

Term OR word for specific type of a SQL table

I am looking for a Term/Word for specific type of tables. I have tried to search a lot, but I could not come up with best search terms for this. Tables that hold some master information, such as ...
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1answer
19 views

Best Azure Solution for Complex Search Index

I need to perform quick searches against a combination of tags while including date ranges: Example: Users who have requested notifications who did not respond to a notification sent at least 3 ...
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0answers
45 views

SQL - Locating closest value in a set

I have a table that contains the percentiles from a reference data set. CREATE TABLE [Core].[RiskFactor]( [SpecialtyCode] [char](2) NOT NULL, [RiskCategoryId] [int] NOT NULL, [Percentile] [tinyint] ...
6
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2answers
130 views

Does it make sense to use a cursor for complex business logic?

I am dealing with a pretty extensive data set. After a few joins, the foundation table has something like 40 columns. The next 40 columns will all be calculated. I am trying to keep my Java clean of ...
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2answers
90 views

Does sql use hastables for indexes? [closed]

Are there other ways of indexing?, Which are the more used? Does sql have an standard for indexes, it uses hash tables?
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4answers
106 views

Data Model - How to better model this circular reference

I'm designing the data model for a project where users can create documents, save revisions of that document that can be reverted to, and publish documents. The basic data model I have right now is ...
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1answer
146 views

Getting data from a database with the MVC model

I am creating an application which will have a very large database to draw it's information from (a student registration system to be exact). The database is created with Microsoft SQL Server if that ...
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3answers
165 views

How to test data based on SQL queries?

I'm trying to set up a test framework for (SQL) datasets that get updated daily. I want to write assertions that involve comparisons between two tables–for example, the sum of column visitors in the ...
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1answer
220 views

How is one or more aggregate function implemented in most SQL engines?

In the book Database Fundamentals, Silberschatz. It is explained that aggregate functions can be calculated on the march. This make sense. What it means is that for calculating the maximun, average ...
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3answers
193 views

What to do with database foreign keys in an entity class?

I know that an attribute defines the state of an object. So, is it correct to keep attributes that don't define the state of an object of a class? For example, I have an Employee class, which has ...
7
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4answers
251 views

Encapsulation for complex queries

I tried asking this question first on StakOverflow in a more concrete manner, but after being pointed here I realized I should rephrase it in more general terms; however, you can still review the ...
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2answers
247 views

Registration form with email verification

Can someone point me in the right direction: I need to make a website with a registration form, to create accounts with e-mail verification, to write the forms content in a database table or something ...
2
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0answers
61 views

ODBC 3 Multiple Statements vs Multiple Connections

So right now I have a single thread to handle all the requests for the database. Let's say I have 400 requests per second for logins / logouts / other stuff, and 400 requests per second which are only ...
0
votes
1answer
68 views

Why storing a payroll in XML type field would be good or bad

We have a PAYROLL issues by the client to make it dynamic i.e. to make the whole process computerized. It includes: Employees Allowances (Scale wise, which could change yearly or monthly or ...
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3answers
114 views

Getting RowCount without wasting resources

I have a large SQL query that relates 6-7 different tables and returns fourteen different rows as distinct sets, in a union with an equally-large query, that at times can return over a thousand ...
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0answers
113 views

SQL Query and Java Constant Abuse?

I am currently charged with taking over a lot of code that is written with fields names placed into Java constant at the top of the file, and then the SQL queries constructed using string ...
1
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1answer
80 views

auto generated web CMS for pre-existing SQL db?

What I'm looking for is a way to auto-generate a simple web-based CMS for a simple pre-existing SQL database. To be used by 'app administrators', not the general public. Something that: allows ...
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0answers
47 views

More scalable alternative to a transaction-per.request in a SQL+REST stack?

I'm new in web programming with SQL database. So please forgive my ignorance. I'm using some modern framework to make a REST server with a SQL database. I'm using transaction only when I think I need ...
2
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2answers
351 views

SQL query or C# .net code for csv files import?

My aim here is to find out the best possible and feasible solution for my dilemma. I want to import some csv file (may contain around 50~60K records) into database after some manipulation into the ...
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0answers
17 views

Conceptually, how should a unidirectional multivalued relationship be implemented?

Ok, I'm trying not to upset the programmers list, but not so successful so far. My apologies. I'm trying to understand, conceptually and based on experience, which is the correct way for a JPA ...
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2answers
103 views

Why are triggers seen as a last resort to solve multiple paths in cascading deletes?

There is a problem using ON DELETE CASCADE on foreign keys in a SQL database if there are multiple paths from the root foreign key to the leaf. The way around this seems to be to replace the ON DELETE ...
2
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2answers
150 views

Why use JSON dataset rather than SQL Query?

A colleague was asking me to explain a system information flow, as they are having problems with the wrong information being presented. It seems that what they have created is a custom built website, ...
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1answer
141 views

Relationship between REST APIs and Databases [duplicate]

I've been studying databases and rest APIs lately and I have a question about the relationship between the two. Imagine I have a database with three tables, STUDENTS, ENROLLED, and CLASSES. STUDENTS ...
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0answers
124 views

Best practices for dashboard of near real-time analytics

I’m currently building a dashboard to view some analytics about the data generated by my company's product. We use MySQL as our database. The SQL queries to generate the analytics from the raw live ...
2
votes
4answers
109 views

Keeping a ratio column that's the division between two other columns

I'm about to build a SQL table where I want to store currency orders. That means that I need to store how much I paid for a certain quantity, and the ratio between both quantities. So for example: +--...
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0answers
18 views

SQL data model for nested milestones/timframes

I'm currently weighing different approaches to a data model and I'm curious what others would do. The main nugget of info is ACTIVITIES, which belong to a chain of milestone time releases. Stages ...
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0answers
94 views

Options for implementing database and programming logic for statistics application?

I am implementing a statistics driven web application. The statistics relate to sporting events. Right now I have a postgresql database with a table that holds a row for each match. This is a ...
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1answer
54 views

Querying Results from End of the table

Normal behavior of the SQL Table is to add new rows in end of the table. I want to query results of single row only. So mysql command is SELECT id FROM users WHERE country='india' LIMIT 1 this ...
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0answers
16 views

When would I choose a Lucene/MSFT Search of SQL to store Spatial data?

I need to store the locations of stores and allow customers to query nearby businesses, with a varying amount of filters. The filters in the Search world seem to be named "facets" What reasoning ...
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0answers
108 views

Using mysql 5.7 Json Columns for EAV

I am developing an e-commerce product and I have been able to implement all functionality and am left with allowing users to create additional attributes for a product. Right Now I have two options. ...
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0answers
107 views

Advice on program performance after changes

So, the situation is like this: For the past two years, I have implemented a class in c# which is used to filter different fields from different tables in database (SQL), for reporting purposes. Now ...