单选题
Consider the following:
AIt shows the total size of the index row
BIt shows how many columns in the index are examined
CIt shows the number of characters indexed in the key
DIt shows how many bytes will be used from each index row
正确答案
答案解析
略
Which statement best describes the meaning of the value for the key_len column?（）AIt shows the total size of the index row
BIt shows how many columns in the index are examined
CIt shows the number of characters indexed in the key
DIt shows how many bytes will be used from each index row