Mssqllocaldb File

“It’s SQL Server Express,” Lena said. “Same parser, same optimizer, same transaction semantics. It just runs in my process. No Windows service. No admin rights. No installers. Microsoft shipped it with Visual Studio 2012 and it’s been there ever since, hiding in plain sight.”

Lena flinched. “SQLite isn’t a relational database. It’s a clever file with SQL pretensions. We use ROW_NUMBER() , CTEs, and MERGE statements. SQLite will choke. We need the real engine.” mssqllocaldb

Three years later, Lena was a principal engineer. A new hire asked during onboarding: “Why do we use LocalDB for testing instead of a containerized SQL Server?” “It’s SQL Server Express,” Lena said