You can use the join() method to concatenate (join) items in a list to a single string in Python. The join() method takes one argument, which is the list of strings to be joined. Here's an example: words = ['this', 'is', 'a', 'sentence'] sentence = ' '.join(words) ...
将多个查询结果返回一个结果集合的运算符是——。 A. JOIN B. INTO C. UNION D. LIKE 相关知识点: 试题来源: 解析 C 正确答案:C 解析:将多个查询结果返回一个结果集合的运算符是UNION。JOIN表示表之间的连接。将查询结果保存到新表的运算符是INTO。LIKE表示字符匹配。
publicenumGradeLevel { FirstYear =1, SecondYear, ThirdYear, FourthYear };publicclassStudent{publicrequiredstringFirstName {get;init; }publicrequiredstringLastName {get;init; }publicrequiredintID {get;init; }publicrequired GradeLevel Year {get;init; }publicrequired List<int> Scores {get;init; }...
百度试题 题目合并多个查询结果集,应使用( )关键字。 A. join B. union C. into D. and 相关知识点: 试题来源: 解析 B.union 反馈 收藏
publicenumGradeLevel { FirstYear =1, SecondYear, ThirdYear, FourthYear };publicclassStudent{publicrequiredstringFirstName {get;init; }publicrequiredstringLastName {get;init; }publicrequiredintID {get;init; }publicrequired GradeLevel Year {get;init; }publicrequired List<int> Scores {get;init; }...
publicenumGradeLevel { FirstYear =1, SecondYear, ThirdYear, FourthYear };publicclassStudent{publicrequiredstringFirstName {get;init; }publicrequiredstringLastName {get;init; }publicrequiredintID {get;init; }publicrequired GradeLevel Year {get;init; }publicrequired List<int> Scores {get;init; }...
百度试题 题目将多个查询结果合并为一个查询结果集合的运算符是( ) A. JOIN( B. UNION( C. INTO D. LIKE 相关知识点: 试题来源: 解析 B.UNION( 反馈 收藏
classJoinDemonstration{#regionDataclassProduct{publicstringName {get;set; }publicintCategoryID {get;set; } }classCategory{publicstringName {get;set; }publicintID {get;set; } }// Specify the first data source.List<Category> categories =newList<Category>() {newCategory {Name="Beverages", ID=...
classJoinDemonstration{#regionDataclassProduct{publicrequiredstringName {get;init; }publicrequiredintCategoryID {get;init; } }classCategory{publicrequiredstringName {get;init; }publicrequiredintID {get;init; } }// Specify the first data source.List<Category> categories = [new Category {Name="Bever...
下面的代码示例演示如何使用 GroupJoin<TOuter,TInner,TKey,TResult>(IEnumerable<TOuter>, IEnumerable<TInner>, Func<TOuter,TKey>, Func<TInner,TKey>, Func<TOuter,IEnumerable<TInner>, TResult>) 对两个序列执行分组联接。 C# 复制 class Person { public string Name { get; set; } } class Pet { ...