如果我没记错的话，这将运行整个表扫描，因为您通过函数传递列.MySQL 会乖乖地为每一列运行函数，绕过索引，因为查询优化器无法真正知道函数的结果.

If I remember correctly, that will run a whole table scan because you're passing the column through a function. MySQL will obediently run the function for each and every column, bypassing the index since the query optimizer can't really know the results of the function.

我会做的是:

SELECT * FROM transactionlist 
WHERE TranDateTime BETWEEN '2008-08-17' AND '2008-08-17 23:59:59.999999';

这应该会告诉你 2008-08-17 发生的一切.

That should give you everything that happened on 2008-08-17.