For SQL Server get computed column names and definitions

ComputedColumnsDefinitions.sql

SELECT SCHEMA_NAME(o.schema_id) AS schema_name,
       c.name AS column_name,
       OBJECT_NAME(c.object_id) AS table_name,
       TYPE_NAME(c.user_type_id) AS data_type,
       c.definition
FROM sys.computed_columns c
    JOIN sys.objects o
        ON o.object_id = c.object_id
ORDER BY schema_name,
         table_name,
         c.column_id;