在这个例子中,name字段的实际长度为'John',即4个字符,占用12字节(4 * 3)。因此,key_len的值为: [ \text{key_len} = 12 + 4 = 16 ] 3.2 不同数据类型的key_len示例解析 为了更直观地理解key_len的计算方法,我们来看几个不同数据类型的示例。 示例1:整型字段 假设有一个表orders,其结构如下: CREAT...
explain select * from employee where username = "john";+---+---+---+---+---+---+---+---+---+---+---+---+| id | select_type | table | partitions | type | possible_keys | key | key_len | ref | rows | filtered | Extra |+---+---+---+---...
题目Unit7 10第五种题型:英汉互译(Translation)UNIT1.1)这个小男孩最喜欢做的事就是搭积木。What the boy likes to do most is putting together building blocks.2)就先前的工作经验而言,约翰是这个职位的最佳候选人In terms of previous working experience, John is the best choice for thi...
Situation: You are the assistant of the general manager Mr. John Smith of Pacific Telecommunications. Mr. Smith received the invitation letter above, now you are asked to write a response of accepting the invitation for him. 点击查看答案 第5题 听力原文:W: Sorry to bother you, Mr.Smith, ...
[题目]-Did you that John was a little quiet yesterday?-Yes. He didn't say a word the whole day.A. explainB. hopeC. wishD. notice
John was here to see you. What happened to the man? A.He had to work overtime. B.His car ran out of gas. C.He was held up in traffic. D.He had a traffic accident. 点击查看答案 第5题 听力原文:M: Could you show me that once more?W: Sure. Put the paper into the machine...
LYELL, Charles (1797-1875). Principles of Geology, being an Attempt to Explain the Former Changes of the Earth's Surface, by Reference to Causes Now in Operation, London: John Murray, 1830-1833. 3 volumes, 8° (224 x 144mm). Half titles in volumes I & I
1. 产品包装内含哪些? 包装盒、泡沫保温盒、冰盒、小分子化合物产品、相应说明文件。(注:常温保存产品可能不含冰盒) 2. 收到产品后应做些什么? * 收到产品后,在打开包装前请认真核对标签信息,如有问题,请不要拆封。 * 打开包装后,请确认以上物品是否齐全。若一个月内您对货物信息未提出任何疑问,我们将默认...