MyISAM Vs InnoDB MySQL引擎上的选择查询结果的差异（特别是对于全文本搜索）

Question

I would like to know if there is any difference in the result output of the same select query on MyISAM Vs that on InnoDB for the same table.

The thing I am aware of is MyISAM can do FULL TEXT searches. But will the order of the output differ ?

Answer 1

The ordering of the output is determined by the order by clause. You have three possibilities.

First, there is no order by clause. Then the result set is in an indeterminate order. You cannot say that running the same query on the same data will produce results in the same order on multiple runs. You definitely cannot make any statement about runs on different databases.

Second, there is an order by clause and it is a stable sort -- meaning that each key for the order by uniquely identifies each row (there are no ties). Then the results are specified by both the SQL standard and MySQL documentation. The result sets will be in the same order.

Third, there is an order by clause and there are ties. The keys will be in the same order in both result sets. However, because keys with ties can be in any order, the two result sets are not guaranteed to be in the same order.

Summary: if you want results in a particular order, use order by .