Presenting you with an updated version of our sp_snapshot procedure, allowing you to easily create database snapshots. This new version fixes a bug that we’ve found in version 2...
2025-10-24 (first published: 2025-10-02)
1,526 reads
It’s been forgotten about and neglected for few years but I’ve decided to dust off the cobwebs and revive our YouTube channel. Keep an eye on it, every new...
2025-07-11
25 reads
A while ago I was looking into some odd errors that were cropping up in an application, when I spotted that all the columns in a table were defined...
2025-06-30
60 reads
The Distributed Availability Group Dashboard can be downloaded from our GitHub repo. https://github.com/SQLUndercover/UndercoverToolbox/blob/master/DAG%20Dashboard.pbix. This comes off of the back of my last post looking at using a distributed availability...
2025-04-14 (first published: 2025-04-01)
372 reads
SQL Server migrations are a headache, ask anyone who’s been through the pain of moving a reasonably large server and I’m sure they will agree. There are all sorts...
2025-02-19 (first published: 2025-02-05)
2,064 reads
This post comes off the back of my last, where I looked at issues caused by explicitly declaring a large number of values in an IN clause. The query...
2024-12-11 (first published: 2024-12-04)
935 reads
Recently I received a cry for help over Teams. The issue was that an application was throwing up the following SQL error, The query processor ran out of internal...
2024-11-13 (first published: 2024-10-30)
1,469 reads
“Could you help me, we deleted the database’s transaction log file and now that database is stuck in ‘Recovery Pending’?” This was a panicked call that I received a...
2024-10-14 (first published: 2024-09-26)
541 reads
Full documentation on the Undercover Catalogue can be found HERE We’ve spotted a bug in the Databases module where an unprintable ASCII character was being inserted at the beginning of...
2024-09-12
54 reads
Way back in the mists of time I wrote a post on how to backup SQL server to an S3 bucket using TNTDrive, https://sqlundercover.com/2018/06/18/backup-your-on-premise-sql-server-directly-to-an-aws-s3-bucket/. Back then, if we wanted...
2024-08-26 (first published: 2024-08-13)
258 reads
If you've ever loaded a 2 GB CSV into pandas just to run a...
By James Serra
What problem is Fabric Ontology trying to solve? For years, most data conversations have...
By Steve Jones
Recently I ran across some code that used a lot of QUOTENAME() calls. A...
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We create the following table and then insert some records in it:
create table t1 ( id int primary key, category char(1) not null, product varchar(50) ); insert into t1 values (1, 'A', 'Product 1'), (2, 'A', 'Product 2'), (3, 'A', 'Product 3'), (4, 'B', 'Product 4'), (5, 'B', 'Product 5');What happens if we execute the following query in both Sql Server and PostgreSQL?
select id,
category,
string_agg(product, ';')
over (partition by category order by id
rows between unbounded preceding and unbounded following) as stragg
from t1; See possible answers