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successfully returned 1. Redis 127.0.0.1:6379> hdel myhash field1 (integer) 1 #再次删除myhash键中字段名为field1的字段, because the previous command has deleted it, because it is not deleted, 0 is returned. Redis 127.0.0.1:6379> hdel myhash field1 (integer) 0 #判断myhash键中是否存在field1字段, because the previous command has deleted it because it returns 0. Redis 127.0.0.1:6379> hexists myhash field1 (integer) 0 #通过hsetnx命令给myhash添加新字段field1, whose value is Stephen, because the field has been deleted, So the command

Original URL: http://blog.163.com/magicc_love/blog/static/18585366220123111128283/Start PL/SQL Developer character encoding inconsistency errorDatabase Character Set (Al32utf8) and Client character set (ZHS16GBK) are different.Character set conversion may cause unexpected results.Note:you can set the client character

The role of Dict is to establish a set of keys and a set of value mappings, dict key cannot be duplicated.sometimes, we just want to dict key, do not care about the value of key corresponding to the purpose is to ensure that the elements of this set will not be duplicated, then the set will come in Handy.The

Set quoted_identifier onGoWhat does that mean? SyntaxSet quoted_identifier {on | off} NoteWhen set quoted_identifier is on, the identifiers can be separated by double quotation marks, and the text must be separated by single quotation marks. When setquoted_identifier is off, the identifier cannot be enclosed in quotation marks and must comply with all the rules of the transact-SQL identifier. For more info

Label: operation Result set In order to fit the test, two tables have been built, and some test data have been added, which are repeatedly recorded as soochow characters. Table: Person_1 wei People 　　　 Table: Person_2 Shu Characters 　　 　　A, Union forms and sets Union can connect two or more result sets to form a "set". all the records of the child result set are

The data set is generally divided into three parts: train set, valid set, test set It is used to train the model, adjust the hyper-parameters and test the model. Where valid set is also called development set, referred to as De

Label:Operation Result setIn order to fit the test, two tables have been built, and some test data have been added, which are repeatedly recorded as soochow characters. Table: Person_1 wei People 　　　 Table: Person_2 Shu Characters 　　 　　A, Union forms and sets Union can connect two or more result sets to form a "set". all the records of the child result set are grouped together to form a new result

In Python, set set is one of the basic data types, and it has both mutable set (set) and immutable set (Frozenset). creating Set Sets, collection set additions , collection deletions ,

In order to fit the test, two tables have been built, and some test data have been added, which are repeatedly recorded as soochow characters.Table: Person_1 wei People　　　Table: Person_2 Shu Characters　　　　A, Union forms and setsUnion can connect two or more result sets to form a "set". all the records of the child result set are grouped together to form a new result set