Does limiting a query to one record improve performance

Question

Will limiting a query to one result record, improve performance in a large(ish) MySQL table if the table only has one matching result?

for example

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Answer 1

Yes, you will notice a performance difference when dealing with the data. One record takes up less space than multiple records. Unless you are dealing with many rows, this would not be much of a difference, but once you run the query, the data has to be displayed back to you, which is costly, or dealt with programmatically. Either way, one record is easier than multiple.