Detect what version of SQL Server Express engine is available before connection?

I would like to detect what version of SQL Server Express engine is available so that I can connect either to the (localdb)\v.11 (SQL Server 2012 per or (localdb)\MSSQLLocalDB (SQL Server 2014 and up per instance name when attempting to attach a file in the connection string using the AttachDBFileName= mechanism.

I would most likely want to do it from Powershell in some manner, but whatever method is reliable, I can use. I do know that sometimes a LocalDB connection can be a bit slow as it attaches the file and starts up on demand, so I have in the past been pretty lenient on the connect timeout for these LocalDB connections compared to the real SQL Server connections, so I would prefer not trying to connect and waiting for timeout, since I think I’ve already got an exaggerated timeout just for normal successful connection.

How to reconstruct a complicated built-in function (e.g. for modification or use in a version that does not have it yet)

Is it possible to extract the definitions for a built-in function to reconstruct a similar user defined function. This would be useful to port new mathematica functionality to older versions or to create modified versions of built-in functions.

I found that

Needs["GeneralUtilities`"] PrintDefinitions[symbol]; 

could get us close (see but it would still be quite a job to reconstruct the full function including all of its dependencies from there. Have there been any automated attempts to try this kind of thing?

As an example I would be very interesting in reconstructing ExternalEvaluate (or if that is too ambitious to reconstruct only the part that converts Mathematica arguments supplied with "Arguments"->{args} to python expressions in the case that we ExternalEvaluate using a python session.)

(I hope this type of question is not frowned upon in light of copyright issues. I would just like to deal with incompatibility issues between different (Licensed) versions of Mathematica.)

How to migrate a MySQL server database from an older version to a newer?

I am trying to import a database from an older MySQL server (v 5.0) to a newer (8.0).

So I exported the dump file from the original database, and tried to import in the newer system, but then it’s showing a thousand syntax errors.

The thing is that the older database is working fine, so I presume that the problem is the version. May someone help? Thanks!

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is postgresql identify would be continue in new version of PostgreSQL

Now I am use serial to generate table primary key in PostgreSQL 13, but today I found the ID jumps and not continue, it will waste many ids, I read the docs and found PostgreSQL add indentify as a SQL standard primary key generate. And the identify is continue? What should I do get a continue primary key id in PostgreSQL 13? I search from internet and recommand to use identify in new version of PostgreSQL but no one tell me the ID is continue.

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Version 15.20 has stopped making PHP Info Exploit Links

It seems that version 15.20 no longer makes PHP info exploit links. I have an install still running 15.19 and 15.17 and both are still working for these sites and makes over 500 links.
Version 15.20 literally makes zero links now. In the logs it shows the following:
Those same urls are all successful on previous versions. Hope you can fix it.

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Forcing a fresh start with Postgres after updating major version

On my Manjaro machine, I updated packages, and Postgres got updated to version 13.2-1.

Before the update, I had some databases on the previous version. Now Postgres won’t start because it recognises that the existing databases are from the old version. When I attempt to start Postgres, I get:

~|⇒ sudo systemctl status postgresql ● postgresql.service - PostgreSQL database server      Loaded: loaded (/usr/lib/systemd/system/postgresql.service; disabled; vendor preset: disabled)      Active: failed (Result: exit-code) since Fri 2021-03-12 21:30:02 GMT; 2min 53s ago     Process: 3173 ExecStartPre=/usr/bin/postgresql-check-db-dir $  {PGROOT}/data (code=exited, status=1/FAILURE)  Mar 12 21:30:01 xps systemd[1]: Starting PostgreSQL database server... Mar 12 21:30:02 xps postgres[3173]: An old version of the database format was found. Mar 12 21:30:02 xps postgres[3173]: See Mar 12 21:30:02 xps systemd[1]: postgresql.service: Control process exited, code=exited, status=1/FAILURE Mar 12 21:30:02 xps systemd[1]: postgresql.service: Failed with result 'exit-code'. Mar 12 21:30:02 xps systemd[1]: Failed to start PostgreSQL database server. 

Those databases weren’t important. They were for my personal pet projects and I’m happy to delete them.

How do I do that? Postgres won’t start, so I can’t delete them through psql. How can I force the latest version to start afresh? Ignore or delete the existing databases.