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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1answer
42 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 ...
0
votes
1answer
81 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 ...
0
votes
1answer
22 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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votes
1answer
30 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 ...
0
votes
2answers
50 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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votes
0answers
21 views

SQL Server - Fetch data

Project Case: Send sms communication on Parent's mobile number on the birthday of either Student or Parent for ACTIVE courses. Data Model: Following four tables are in picture here. Course Role table ...
0
votes
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 ...
0
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0answers
9 views

SQL Server - Sum Until Threshold Reached [migrated]

I have a SQL Server database with shift worked information for each employee. The main table (called "shift_worked") is structured like the following: id employee_id period day hours 1 ...
1
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0answers
44 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
votes
2answers
124 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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votes
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?
2
votes
4answers
101 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 ...
1
vote
1answer
133 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 ...
3
votes
3answers
122 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 ...
2
votes
1answer
213 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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votes
3answers
185 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
votes
4answers
231 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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votes
2answers
211 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
votes
0answers
52 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
67 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 ...
0
votes
3answers
113 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 ...
1
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0answers
82 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
vote
1answer
72 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 ...
1
vote
0answers
45 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
votes
2answers
323 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 ...
0
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0answers
16 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 ...
4
votes
2answers
102 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
votes
2answers
136 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, ...
0
votes
1answer
127 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 ...
0
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0answers
84 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
99 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: ...
0
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0answers
17 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 ...
0
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0answers
82 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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votes
1answer
52 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 ...
0
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0answers
14 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 ...
4
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0answers
84 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. ...
0
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0answers
104 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 ...
0
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0answers
49 views

Use vb.net sql reader as a Delegate to gather Data

Is there a way to use a sub to create a loop, but change the content of the inside of the loop? I don't know what I don't know. I keep looking at this code and I have a feeling that it's possible. ...
0
votes
1answer
143 views

Designing Pricing table (RDBMS agnostic)

I'm designing a pricelist table for my database. It will include Customer, Model, Start_date, End_date, Price, Currency, RRP When I update a new pricelist which is sent every now and then (maybe ...
42
votes
8answers
6k views

Is the use of NoSQL Databases impractical for large datasets where you need to search by content?

I've been learning about NoSQL Databases for a week now. I really understand the advantages of NoSQL Databases and the many use cases they are great for. But often people write their articles as if ...
4
votes
2answers
91 views

How to represent a collection with capacity in a database?

Concerning normalization of a one to many relationship, I am not sure how to represent a collection with a specified capacity in a database. I can think of two ways to represent an entity A with a ...
3
votes
3answers
110 views

Relational table design for data ownership

Setup (schema simplified for clarity) Suppose I have a table called resource: +---------------+--------------+------+-----+ | Field | Type | Null | Key | ...
1
vote
1answer
82 views

How to handle multiple “valid after {date}” in a performant way

We work on an Application which displays a duty roster and also some other DateTime related things. So my Database is full of Relations like in this small Example: This results in big ...
3
votes
1answer
98 views

Django Migrations: Binds data to code?

If you have custom code for models (custom validators and custom fields are examples), Django Migrations will import them directly into the migration files. An example: file web/models.py def ...
1
vote
1answer
55 views

MS SQL Server Cell level Encryption options

Recently, i got the task of doing some research into the data encryption at the cell level. I tried using the Symmetric key (by passphrase) & second option i took is Symmetric key (by ...
1
vote
2answers
74 views

Working with local connections instead of global

In recent weeks I became very concerned that the way I've been working with database connections for the past years, is simply wrong. I exclusively create a new connection for each database operation ...
1
vote
4answers
250 views

How to deal with long running transactions?

I'm developing a Content Management System (CMS) and I would like to include a "Save Changes" button. I mean: a user performs several changes in the database, but those changes are still not ...
0
votes
1answer
37 views

Database multiple database query each time

I'm writing a rest service. For each request I use about 4-8 queries. Should I try to refactor those into a single query?
2
votes
3answers
156 views

Long running DB query with concurrent write at the same time [closed]

We have a big table with a lot of data and a select query which takes 3 seconds to run. However we are a highly concurrent environment and each second we get 100 new records in our database. So ...
3
votes
2answers
376 views

Deep SQL relationships to a C# object model

I have a database with deep table to table relationships for example Clients (one to many) -> ClientData (one to many) -> ClientJob (one to many) -> ClientProcess (one to many) -> ...