(For those who don’t know Sybase supports an SQL implementation which is seemingly used nowhere except sales and trading for Wall Street banks, who largely adopted it in the 90’s and have been slow to move off. MS SQL Server was originally a port of Sybase.)
Back in the 90s Sybase was the only "major" database that SAP didn't support, ostensibly because it didn't support row-level locking, only page-level. Support for SQL Server 6.5 was added in 1993/1994 with the assistance of Microsoft (SQL Server also only supported page-level locking at the time and was still based largely on Sybase). Sybase ASE was only supported by SAP many years later, after they'd bought the company (primarily, I believe for the now-discontinued mobile products).