SQL Server Express

 SQL Server Express

Scale limits

Feature	Express with Advanced Services	Express
Maximum compute capacity used by a single instance - SQL Server Database Engine1	Limited to lesser of 1 socket or 4 cores	Limited to lesser of 1 socket or 4 cores
Maximum compute capacity used by a single instance - Analysis Services or Reporting Services	Limited to lesser of 1 socket or 4 cores	Limited to lesser of 1 socket or 4 cores
Maximum memory for buffer pool per instance of SQL Server Database Engine	1410 MB	1410 MB
Maximum memory for Columnstore segment cache per instance of SQL Server Database Engine	352 MB	352 MB
Maximum memory-optimized data size per database in SQL Server Database Engine	352 MB	352 MB
Maximum memory utilized per instance of Analysis Services	N/A	N/A
Maximum memory utilized per instance of Reporting Services	4 GB	N/A
Maximum relational database size	10 GB	10 GB

database size 10GB (the limit is on the data file, it doesn't include log files)

Editions and supported features of SQL Server 2019 (15.x)

https://docs.microsoft.com/en-us/sql/sql-server/editions-and-components-of-sql-server-version-15?view=sql-server-ver15

Microsoft® SQL Server® 2019 Express

https://www.microsoft.com/en-us/download/details.aspx?id=101064

SQL Server 下載| Microsoft

https://www.microsoft.com/zh-tw/sql-server/sql-server-downloads