manual疑问

andrefun

Select_range_check

The number of joins without keys that check for key usage after each row. If this is not 0, you should carefully check the indexes of your tables.

这句话“The number of joins without keys that check for key usage after each row.” 是什么意思？

showsa

The number of joins.

joins without keys.

keys that check for key usage after each row.

这样看你就明白了

andrefun

原帖由 showsa 于 2008-7-31 15:38 发表
The number of joins.

joins without keys.

keys that check for key usage after each row.

这样看你就明白了

就是keys that check for key usage after each row.不明白

showsa

join查询时没有使用索引关联的查询数量