phpMyAdmin - Query Execution Time

Question

When I execute a simple statement in phpMyAdmin like

SELECT *
FROM a

where \"a\" has 500\'000 rows, it gives me a time of a few milliseconds on

Answer 1

phpMyAdmin automatically appends a LIMIT clause to your statement, so it has a smaller result set to return thus making it faster.

Even if you need all 300,000 or 500,000 results then you should really use a LIMIT. Multiple smaller queries does not necessarily mean same execution time as a single big query.