Docs / Data extensions
LookupRowsCS is an AMPscript function in the data extensions category. Case-sensitive match.
LookupRowsCS(de, col, value, ...)
%%=RowCount(LookupRowsCS("Orders", "Email", "ADA@EXAMPLE.COM"))=%% match(es)
0 match(es)
Output produced by AmpSend's AMPscript engine (validated against Salesforce's own test corpus) - not a hand-written result.
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LookupRowsCS in the official AMPscript reference - or browse the official index of AMPscript functions for platform behavior and edge cases.