MySQL Benchmark

Question

I am trying to use MySQL benchmark to test some queries. But, I am running to an error.

SELECT benchmark (10000, (select title from user));

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Answer 1

From http://dev.mysql.com/doc/refman/5.0/en/information-functions.html#function_benchmark

Only scalar expressions can be used. Although the expression can be a subquery, it must return a single column and at most a single row. For example, BENCHMARK(10, (SELECT * FROM t)) will fail if the table t has more than one column or more than one row.

Try

SELECT BENCHMARK(10000, (SELECT title FROM user LIMIT 1));