Docs / Data extensions
RowCount is an AMPscript function in the data extensions category.
RowCount(rowset)
%%=RowCount(LookupRows("Orders", "Email", emailaddr))=%% orders
2 orders
Output produced by AmpSend's AMPscript engine (validated against Salesforce's own test corpus) - not a hand-written result.
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RowCount in the official AMPscript reference - or browse the official index of AMPscript functions for platform behavior and edge cases.