Coalesce

Coalesce - co-a-lesce - verb

• co + alesce ( grow)。come together to form one mass or whole. 合并，兼并
• In IT
  • SQL,
    • The COALESCE() function returns the first non-null value in a list.
  • ServiceNow,
    • A field marked with "coalesce" in the transform map means if a record with data in the "coalesce" field exists, then update, else insert.