Validating SQL for backward compatibility - SQL Server - sql-server

Is there a way in SSMS to validate SQL code will work with older databases? Our development staff is on SQL Server 2017. We have a client who still runs 2012. It would be nice to know if any of our code will fail before deploying on the client.
Setting the compatibility level on the development server has no effect.

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Trouble after Upgrade SQL Server version and have two server now in services.msc

I'm a beginner in this, I've been searching for long on internet. But as many solution in internet, I don't understand as much i wanted. And I have some question to for resolution. I see a place the recommend to ask some like this as Super User, but I recently just started using 'Stack Overflow' so I don't know How To Use Super User.
Start when I download a new setup of SQL Server 2016 and choose option to 'Upgrade-from-previous-version', from process I see, it just added 2 features.
From what I really want is to change entirely my SQL server from 2014 to 2016.
Two Server in services.msc
So i try to do option 'basic-installation' from installer and it work honestly but provide 2 server which server 2016 and 2014.
Maybe I can just uninstall the server 2014, and get work with 2016 instead. But Can I bring my database in 2014 too?, I mean it has compatibility-problem.
And it don't have SQL Server Management Studio so I download a newest version of it (v18.00)
Two server with different SQL Server version
My question is =
Can I keep my database in server 2014, my database in 2016 is empty (did I must attach it again)?
Did it just OK to have two Microsoft SQL Server Management Studio?
Why I don't get MSSMS when I install SQL Server 2016?
If I must do Question1, How To Upgrade my database to version 2016?
Is it bad for my laptop to having two Version of SQL Server, or I must delete one?
Backup and restore to 2016 (or keep it in 2014)
Yes, but not necessary, just use latest version, uninstall older
Management Studio can be downloaded separately
See (1)
No, both can be kept, but remember that both services will be running which may impact performance and resource usage. You can stop these services using SQL Server Configuration Manager

Compatibility issue between SQL Server and Visual Studio

I think you can help me.
I am developing an application for a small company. I have been working on Visual Studio 2015 with a SQL Server 2014 database and I have made a noob mistake. My app was almost finished but I discovered that the company has only one server with Windows Server 2003 on it, and it is not possible to update it.
Windows Server 2003 works up to SQL Server 2008 so I have tried but it has been impossible to me to attach my database to SQL Server 2008 (even changing compatibility level to 100) or connecting a new 2008 database to the application in Visual Studio 2015.
I do not know what to do now. Is there some possibility to make that my database works? Or is any other DBMS that would be better to work with my 2015 app in my 2003 server? Thanks!
You can create a database in production SQL Server 2008, then
create a Linked Server on your production Server to your development SQL Server 2014 and copy all the tables / procedures / functions over.
How to Create a Linked Server
Backup/restore works with older backup/newer restore server. Detach/attach do the same. The best solution here is to script developer DB (make sure you don't include newest features not supported by the production server) and run on production. If you want to move data as well, it is better to create at least two separate .sql's, one for schema and another for data.

Does my sql code go unavailable when I upgrade my SQL Server from 2008 to 2014?

I have a server running SQL Server 2008 Enterprise version which has a lot of SQL Codes and I want to upgrade it into SQL Server 2014 Enterprise version. But I don't know what will happen after I upgrade the SQL Server. Will there any SQL Code go unavailable/error? Will it run correctly after upgrading?
SQL Server 2008/2014 is a tool. It has got nothing to do with data/procedures/views etc. Data for SQL Server is stored in the form of .mdf files. So, no, your data or procedurers wont be touched. But yes lot of features are going to be deprecated in SQL Server 2014 when compared to SQL Server 2008. Full list is here. You should go through the list and find a suitable replacement for every deprecated item before migrating.

Possible to use SQL Server CE 3 (aka 2005 mobile edition) with merge replication to SQL Server 2008r2?

My client is retiring a server and wishes to move our application's data from SQL Server 2005 to SQL Server 2008r2. We use Merge Replication via IIS to synch the data to Windows Mobile 6.5 devices. The devices currently are running SQL Server CE3, and we'd rather avoid the cost of coding the application to use Sql Server CE 3.5, deploying the new version to hundreds of devices, etc.
Unfortunately, although we were able to get the server side replication conversion set up correctly using 90 schema for all pieces, the clients are not able to get to the server. They seem to be stopped when they hit IIS, reporting that they are not able to reach the publication.
IIS was not changed as part of the conversion, so there should be no configuration problem there. In fact the diagnostics for the IIS replication proxy (i.e SQLCESA30.dll?diag) report that all is well.
It's clear that the snapshot directory is configured correctly as well. It appears that the problem occurs specifically when IIS attempts to communicate via SQLCESA30.dll with SQL Server 2008 R2.
This leads me to believe that there is some basic incompatibility with SQL Server CE 3.0 and SQL Server 2008 R2. Can anybody confirm this is true or offer a workaround?
You will have to install the 3.5 agent, and that also means pointing all devices to a new URL:
https://yourserver/yourdir/sqlcesa35.dll
See this rather confusing blog post for more info: http://blogs.msdn.com/b/sqlservercompact/archive/2007/12/19/connectivity-cross-version-compatibility-sql-server-compact-3-5.aspx
Your scenario is: "2.1.2 SQL Server Compact versions 3.0 or 3.1 and SQL Server 2008 (D4)"
"... a single SQL Server Compact 3.5 Server Agent URL can be used by all SQL Server Compact version 3.x Clients."

SQL 2000 database copy to SQL 2005 options

We have a production web and database server with SQL Server 2000. (However, a few clients they have their own servers with SQL 2005.) So we have local installs of SQL 2005 Express for development on Windows XP SP3 boxes (which don't allow SQL 2000 Enterprise installations).
We often need to copy SQL 2000 databases to SQL 2005 instances. In the past, we have used the SQL Publishing tool (also mentioned here). However, one of our databases is so big that using that tool fails as it creates SQL scripts that get too large for Management Studio to handle them properly. Besides, it takes too long... :)
We would use the Copy Database Wizard included with SQL 2005, but our development machines run SQL 2005 Express which don't included SQL Server Agent, which is required for Copy Database Wizard to work. So, I guess our solution will be to upgrade our development installs with the full version of SQL 2005 (we have an MSDN subscription of course).
I was wondering what other solutions, if any, work well for you guys? (Besides complaining to the bosses to upgrade our production servers to 2005 or even 2008--which I've already tried.)
Back it up in SQL Server 2000 and then use the RESTORE WITH MOVE command into 2005 Express.

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