compare longblob with binary data

[Bernhard Schmidt]

hi all

a question about checking the data of a longblob for equality. assume the `data` field is
of type longblob. the following statement returns the image records with equal data.

SELECT * FROM `image` WHERE `data`=?

how does mysql performe the test. does it check the length of the blob before comparing
the data, or makes it sense to add the length test as follows

SELECT * FROM `image` WHERE LENGTH(`data`) = ? AND `data`=?

any suggestions?

best regard
benny