Questions tagged [sql-server]

Microsoft's SQL Server is a relational database management system (RDBMS) that runs as a server providing multi-user access to a number of databases. It originated from the Sybase SQL Server codebase, which is why both products use the extension of SQL called Transact-SQL (T-SQL).

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Can I rewrite this query to not use UNIONs (or use less)?

Given the following example data: id username group unit department team status 1 user1 g1 u1 d1 t1 active 2 user2 g1 u1 d1 t2 active 3 user3 g1 u1 d1 t3 inactive 4 user4 g3 u6 d12 t30 active 5 ...
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1 answer
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Optimizing a TRANSACT SQL statement [closed]

I'm in need to optimize the following TRANSACT SQL statement : ...
3 votes
0 answers
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SQL query to pivot table into dynamically growing set of columns

I am working on SQL Server I have sample data like this in a table. CustId Bank city rating date rnk 1 Deutsche Delhi 5 10/10/2022 1 1 BOA Pune 6 10/10/2022 2 1 UBS Mumbai 7 10/10/2022 3 1 SBI ...
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0 answers
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Query to get data out of a dirty database

Preface / Background Feel free to request for more information about the data and please let me know of redundant information I can remove to help keep this question as clear as possible. I do not ...
-1 votes
1 answer
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Nested table in query

I have transaction tables called MaterialRequest and MaterialRequestDetails. What I want to check my query and review that it's ...
1 vote
1 answer
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Select certain row if it is in the date range otherwise take fallback

SQL Server 2017 The table contains duplicate contracts per factory with different From and To dates. I'd like to select the correct row based on a declared YearMonth parameter. If this falls in the ...
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1 vote
1 answer
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updated Accounting system data database design

Many thanks for your valuable comments in my previous post. In my previous link Accounting system data database design The primary key and foreign key was not assigned i was thinking handle from front ...
3 votes
2 answers
383 views

Accounting system data database design

I have created an accounting database as per my accounting knowledge. I want to check: Is that database correct which I design for the accounting system? I have table called Mst_AccountGroup(Asset,...
0 votes
1 answer
44 views

Find dogs who stopped being good boys without ever being good boys - Was HAVING the wrong approach?

The problem I have solved is as follows: Consider a table of dogs, DOGGIES, that records on each row the ID of a doggy, one ...
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1 vote
1 answer
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batchUpdate using pdo and MSSQL

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1 answer
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Creating database and two tables linked by foreign key

These commands do what I want, but I'm trying to find out the best approach for this. My main areas of concern are: error handling and disposal of resources. In regards to error handling, I'm catching ...
6 votes
0 answers
145 views

dotnet - creating db records in bulks in a background job

UPDATE: I found the namespace Channels, and this does exactly what I want to do, but in a much more stable way. Please don't use my code for anything important! :) Use case I have a site that (at peak ...
-2 votes
1 answer
48 views

T-SQL Query Performance [closed]

The query below already has indexes based its execution plan but it is still under performant with larger datasets. Are the additional null checks needed and why? Do you see anything that can be done ...
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1 vote
1 answer
203 views

Database schema for discussion forum scraping

I'm scraping posts from various discussion forums and storing those posts, along with some metadata, into a relational database (SQL). My actual use case is a bit more complex, but I think I can give ...
0 votes
2 answers
35 views

Table-Value Function with row-level-locking

I'm implementing row-level-locking on a MS SQL Server. The function I created below works, but even with a very small data set, it takes a significant amount of time to return the results. If I were ...
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1 vote
1 answer
720 views

Get result of a scalar-valued SQL function from C#

I do not receive files on holidays; I only receive files on regular days—i.e., non-holidays. I want to skip 2021-09-06 since that's a holiday (Labor Day) and I know I will not receive any files. ...
-1 votes
1 answer
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IF SELECT statement will break SQL ACID Compliance? [closed]

My QA told me that I should not use IF SELECT before doing an UPDATE statement because it will breaks the atomicity of a ...
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3 votes
2 answers
79 views

Alter authorization on all non-system SQL Server databases

I am not very experienced with T-SQL and feel this can be done better. The script changes ownership of all "user" (non-system) databases to sa. Usage of a ...
2 votes
2 answers
50 views

Complex reporting query suggestion needed for different approach as per latest Tsql format

We have recently migrated from SQL Server 2008 R2 to SQL Server 2017 web edition. I am not a SQL developer but enthuses to learn. Since many of our scrips are of old SQL format, I am searching for ...
3 votes
3 answers
110 views

Retrieving restaurant orders from SQL Server [closed]

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3 votes
2 answers
466 views

PySpark SCD Type 1

I am using PySpark in Azure DataBricks to try to create a SCD Type 1. I would like to know if this is an efficient way of doing this? Here is my SQL table: ...
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1 vote
0 answers
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Re-organizing indices in case of fragmentation is T-SQL

In order to keep the fragmentation ratio of indices low, you should re-organize the indices from time to time on MSSQL. Microsoft describes in the link below how you can check the fragmentation of ...
5 votes
1 answer
186 views

Basic schemas for database and tables creation, bulk import from .csv and basic queries

The following SQL code serves the purpose of assessing basic SQL Server literacy. I am creating database and tables schemas, inserting data from .csv files. Constructing 8 simple queries as answers to ...
0 votes
1 answer
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SQL Query to perform a "reverse exclusion" on a LEFT JOIN with a select from the left side table

I have a set of tables that I want to execute a LEFT JOIN on and bring back "excluded" rows. In addition, I would like the left table's ID included as ...
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1 vote
2 answers
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Optimizing database access using LINQ [closed]

I have the following method that I am trying to optimize. Currently, the method works great, however, it takes a little over 3 hours to complete. I feel like, using some nifty LINQ joins, it should be ...
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1 vote
1 answer
113 views

Retrieve data from two different rows in a single SQL query?

I've a table with the following data and I need to find the number of minutes between two jobs (Say A and C). The following query works but wondering, if there is a simpler way to achieve the same. <...
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3 votes
2 answers
111 views

all appointment based on interval distance

Currently with a given Date and an Interval in Day, I can calculate all of the appointment in the future. for example if you are ...
2 votes
0 answers
37 views

Basic login by username logic with SQL Server

My goal is to make a very simple library with the authentications basics: create a user and save its hashed password, change its password, have a method to check if the password is correct for login. ...
user avatar
2 votes
1 answer
198 views

How to make this query better (e.g. avoid repeating subquery in a query)?

Stack Exchange provides access to query their MS SQL databases. They have a table Posts where each post is either a question or an answer (see the schema on right ...
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2 votes
1 answer
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Performance stored procedure update multi-coulmn sql

I have a stored procedure the every 5 min run in sqlserver high cost iO/cpu do you have any idea to tune this query ...
2 votes
2 answers
127 views

Receive data from SQL and CSV and send it to MySQL database using Python

Details: I have a code, which does the following: Get data from CSV and insert it into MySQL table Get data from SQL Server and insert it into MySQL table Run this code every 240 seconds - to ...
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1 vote
0 answers
32 views

Code for tracking changes and deletions to tables

I have written a SQL server stored procedure to generate "log" tables which store the old values of rows when a table is updated, and also record when rows are deleted ( and by who ). It's quite ...
2 votes
0 answers
43 views

API Layer ClientId and Security style

Im at the point where I am designing my api security and I was going with a custom attribute I don't want to use third party systems as they cost money. I was going to use the client id and the ...
1 vote
2 answers
135 views

Faster/Better Processing for SQL While Loop

I have a list of about 55k Accounts that I am cleaning up. 95% of them are from US/Canada which is what I'm most concerned with. I am going through record by record and will perform various checks ...
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1 vote
1 answer
32 views

Calling a function within stored procedure to derive a value

I am trying to write a sql storeprocedure that basically returns a derived value from an outcome of a function call. The derived field returns the difference in days and if the difference is less ...
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1 vote
1 answer
106 views

Get average post score of TOP 10 tags on StackOverflow using Stack Exchange Data Explorer

I want to use the Stack exchange data explorer in order to display some basic information about the top tags. The query should print the number of questions and answers, the average number of answers ...
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3 votes
3 answers
482 views

Export sql data to xml and csv

I have the below code that takes the sql data and exports it to xml or csv. The xml is processing at good speed but my csv sometimes takes 1 hour depending on how many data rows it exports. My ...
3 votes
0 answers
395 views

Creating SQL Server Database Users Dynamically from User Input

The Application I have an application in testing that runs off of an MS SQL Server database. The app allows users to authenticate using Windows authentication (that is, using the Windows username the ...
5 votes
1 answer
136 views

Excel to SQL server

I am self-taught when it comes to coding. I want to improve, so please give me advice if I have some bad habits or if there is in general a better way of doing this. The idea of this code is to look ...
6 votes
2 answers
177 views

NewSequentialId - pure net core 2.2 implementation of sql server function

i'm currently trying to rewrite sql server newSequentialId() function in pure c# that is performing as fast as possible and eats minimum memory. Question is can I it be done better - current ...
2 votes
1 answer
94 views

Reading customer data

This is the first time I am writing R code to access/manipulate and save data. The SQL query I would normally run then save to a spreadsheet, read it into R, save to another sheet then copy and paste ...
2 votes
1 answer
2k views

Database Model for Feedback Module

I wish to generate an online feedback system. Requirements are Admin can enter feedback questions Admin will select these questions and create a feedback session One Question can be used in many ...
3 votes
2 answers
3k views

Cancel Long Running Query using Cancellation Token AND SqlCommand.Cancel()

I need to be able to cancel a long running query programmatically through our application. The code below will kick off a long running query and give control back to the main thread. At any ...
2 votes
0 answers
51 views

SQL Code That Looks for Dupes with Confidence Score, 3hr / 1.2 BILLION Rows Returned. Optimize?

OK, I have a customer list that has approx 80k records. I need to search and compare looking for duplicates, but duplicates could be an exact match, or a similar match (only some data matches) so it ...
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1 vote
0 answers
34 views

Searching for Duplicates in SQL Table with Confidence Score

Sometimes I'm not sure if my questions should be here or StackOverflow, so I appologize if this is the wrong place. I have a SQL (MS SQL 2016) stored procedure that is evaluating data looking for ...
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0 votes
1 answer
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database connection, fetching rows and handling error in csharp

Fetching database records and displaying as JSON. Asking for revision to ensure if everything's ok, i.e. connections are properly handled and closed in case of error. ...
5 votes
2 answers
308 views

Query with multiple foreign keys to the same table

I have a primary table, REP_ASSIST.ES_LOG with multiple columns that are foreign keys to another table, ...
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4 votes
2 answers
183 views

Function to get current value or default from a string of two values

I have SQL scripts that I want to be executable directly in the editor (like DataGrip or SSMS) and also in automated integration tests. However, in each use-case they require different environment and ...
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7 votes
1 answer
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Zombie killers ranking

Code Review has a Zombie Problem and, in comparison to The Walking Dead TV Show, our survival doesn't depend on killing them all day every day. As a potential solution, I though it would be ...
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3 votes
1 answer
76 views

SQL Sub-query with running total optimization

The codes below get the rows of data until it reaches the total running quantity limit. Notice that the SQL uses sub-query. ...
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