Explain why making a type 1 error is more serious than a type 2 error. Describe type I and type II errors of a mammography in terms of the diagnosis. When do a type I error and a type II error occur? Give an example of a situation in which you believe a type I error is mo...
Type 1 Error: In hypothesis testing, there are two types of error, Type 1 error, and Type 2 error. The type one error is denoted by the {eq}\alpha {/eq} and type 2 error is denoted by the {eq}\beta. {/eq} Type 1 error is more serious that type 2 error. ...
关于explain执行计划,下列哪些说法是正确的:A.type列显示了连接使用了何种类型,从最好到最差的连接类型为:const,eq_ref,ref,range,inde
insert into user values(1,'shenjian'); insert into user values(2,'zhangsan'); insert into user values(3,'lisi'); const扫描的条件为: (1)命中主键(primary key)或者唯一(unique)索引; (2)被连接的部分是一个常量(const)值; explain select * from user where id=1; 如上例,id是PK,连接部分是...
type意味着类型,这里的type官方全称是“join type”,意思是“连接类型”,这样很容易给人一种错觉觉得必须需要俩个表以上才有连接类型。事实上这里的连接类型并非字面那样的狭隘,它更确切的说是一种数据库引擎查找表的一种方式,在《高性能mysql》一书中作者更是觉得称呼它为访问类型更贴切一些。
> explain insert into test values(3,'cc');ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'insert into test values(3,'cc')' at line 1换一个DML比如update,也是不支持的。
摘要: The article reviews the book "What's Up With Ella? Medikidz Explain Type 1 Diabetes," by Kim Chilman-Blair and John Taddeo.年份: 2010 收藏 引用 批量引用 报错 分享 全部来源 求助全文 EBSCO 相似文献What`s up with ella? medikidz explain type 1 diabetes Häftad, 2012. Pris 137 ...
(raw_data):# get predictions and explanations for each data pointdata = pd.read_json(raw_data)# make predictionpredictions = original_model.predict(data)# retrieve model explanationslocal_importance_values = scoring_explainer.explain(data)# you can return any data type as long as it is JSON-...
(1)返回所有记录的SQL,不使用where条件过滤数据,大概率不符合预期,对于这类SQL往往需要进行优化; (2)使用了where条件的SQL,并不代表不需要优化,往往需要配合explain结果中的type(连接类型)来综合判断; 本例虽然Extra字段说明使用了where条件过滤,但type属性是ALL,表示需要扫描全部数据,仍有优化空间。
文章目录 explain执行计划结果分析 0、id 1、select_type 2、table 3、partitions 4、type 5、possible_keys 6、key 7、key_len 8、ref 9、rows 10、filtered 11、Extra explain分析出的索引一定是最优的吗? explain执行计划结果分析 在MySQL中,我们可以通过explain命令查看sql... ...