Docs / Data extensions
UpdateData is an AMPscript function in the data extensions category. Returns rows affected.
UpdateData(de, numKeys, keyCol, keyVal, ..., col, value, ...)
%%=UpdateData("Loyalty", 1, "EmailAddress", emailaddr, "Points", 2000)=%% row updated
1 row updated
Output produced by AmpSend's AMPscript engine (validated against Salesforce's own test corpus) - not a hand-written result.
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UpdateData in the official AMPscript reference - or browse the official index of AMPscript functions for platform behavior and edge cases.