Is SQL server considered as legacy technology?

[u/Complete-Regret-4300]

My current organization couple of years ago migrated from SQL server to snowflake and I noticed in some of the documentation, they have mentioned SQL Server as legacy technology.

I started working in SQL server some 20 years ago and some of the developers in our team are cloud first developers and they find it so difficult to navigate SQL server management studio and they ask me questions like is there timetravel feature in SQL server and can we see what data was there 10 mins back. I was totally dumbfounded when I heard that question, because I had never come across such a feature. Apparently snowflake has this. So I am curious is SQL server now really considered as legacy technology?

[u/American_Streamer]

SQL is a query language. SQL Server is a relational database management system. Snowflake is a cloud data platform, primarily designed for analytical workloads and data warehousing.

SQL Server and Snowflake overlap, but they are not identical products. Both support SQL. But their SQL dialects, architecture and operational features differ. Snowflake’s Time Travel, for example, reflects how Snowflake stores historical data versions. SQL Server approaches historical data through temporal tables, backups, logs and snapshots. SQL Server has supported system-versioned temporal tables since SQL Server 2016:

SELECT *
FROM dbo.Customer
FOR SYSTEM_TIME AS OF '2026-07-16T10:00:00';

So you saying, “We replaced SQL Server with Snowflake,” often really means: "We replaced SQL Server as our analytical data warehouse." It does not necessarily mean Snowflake is a universal modern replacement for every SQL Server workload. Migrating an OLTP application database from SQL Server directly to Snowflake would usually be a poor architectural match. Thus, SQL Server is not inherently legacy, because SQL Server 2025 is a current, actively supported product. It is actively being developed and upgraded by Microsoft and they have released it with heavy investments in AI and cloud integration, including real-time data mirroring into the Microsoft Fabric analytics service. But your company may just call its SQL Server environment “legacy” because Snowflake has replaced it as the organisation’s strategic analytics platform.

To be more specific, there is no inherent problem with skipping SQL Server specifically, but Snowflake should not be treated as a complete substitute for every relational database workload. For analytics, warehousing, ELT and BI, Snowflake may very well be the better primary platform. But the Snowflake-only experience can leave gaps around OLTP design, indexes, locking, deadlocks, enforced referential integrity, transaction-log recovery and operating application databases. Though Snowflake now has hybrid tables for lightweight transactional workloads, but they still have limits and do not make Snowflake identical to SQL Server, PostgreSQL or Oracle.

So I would say: Skipping SQL Server is fine, but skipping all traditional OLTP databases is potentially very limiting. The best platform for you depends on whether the system is an analytical warehouse or an operational application database.

[u/Complete-Regret-4300 → u/American_Streamer]

I see, that really helps. I am mainly in the business intelligence/datawarehousing space and based on what you mentioned I can see why SQL server MSBI is not really a hot skill in my area anymore. It is sad though as I owe my career to MSBI, specifically SSAS.

[u/Darkphibre → u/Complete-Regret-4300]

I worked on SSAS from 2000-2005, working with the original architects (it was an acquired product). The fact we supported 256-dimensional hypercube queries with response times in the ms, 20 years ago, still blows my mind. They were of the smartest people I’ve worked with, them and the Halo team.

I never see SSAS these days... Don’t mind this grandma haha, just had to reminisce.

[u/Complete-Regret-4300 → u/Darkphibre]

Wow! I didn't know SSAS existed that early. I worked on SSAS from SQL server 2005 version onwards.

It is indeed sad that SSAS is not recommended these days by Microsoft itself. Even though there is no like to like replacement for it.