Experience Report addressing the manual migration of MS SQL Server Stored Procedures and Table-Valued Functions to PL/pgSQL. We chose a manual migration from T-SQL over using a PostgreSQL Extension with an automated translation. The motivation was that the T-SQL code contains non-trivial business logic for which we wanted idiomatic PL/pgSQL code. The T-SQL Code used features like -Mix of Stored Procedures and Table-valued Functions -Table variables, (user-defined) table types -Recursive Common Table Expressions -Optional parameters The migration required -Adopting naming conventions -Renaming parameters and local variables -Maping table types -Mapping table-valued parameters to arrays -Mapping table-valued return types to SETOF record -Translating between arrays and tables In this session we will migrate a chain of dependend functions T-SQL functions to PL/pgSQL. We will work around quirks in both T-SQL functions and PL/pgSQL.