INSERT INTO `choose_course` VALUES ('语文', '1', '李雷'); INSERT INTO `choose_course` VALUES ('语文', '1', '韩梅梅'); INSERT INTO `choose_course` VALUES ('语文', '1', '露西'); INSERT INTO `choose_course` VALUES ('语文', '2',
你可以使用以下SQL语句在SQL Server中创建一个测试表: CREATETABLETestTable(ID uniqueidentifierPRIMARYKEY,Name nvarchar(50))INSERTINTOTestTable(ID,Name)VALUES('2C4E76A0-CE8E-4CB6-80DA-4D9A889DF880','John') 1. 2. 3. 4. 5. 6. 获取字符串 在我们开始转换之前,我们需要从应用程序中获取一个字...
AI代码解释 insert intouser_info_tab(`user_name`,`age`,`city`,`status`)values('杰伦',18,'深圳','1');insert intouser_info_tab(`user_name`,`age`,`city`,`status`)values('奕迅',26,'湛江','0');insert intouser_info_tab(`user_name`,`age`,`city`,`status`)values('俊杰',28,'广...
Re: How to limit SELECT results to unique values Tom Arnold May 27, 2014 04:16PM Re: How to limit SELECT results to unique values Phillip Ward May 28, 2014 05:04AM Sorry, you can't reply to this topic. It has been closed.Content...
In SQL, the SELECT DISTINCT statement is used to retrieve unique values from a column in a table. In this tutorial, you will learn about the SQL DISTINCT clause with the help of examples.
百度试题 题目SQL 语句可返回唯一不同的值的是( )。 A. SELECT ALL B. SELECT DIFFERENT C. SELECT UNIQUE D. SELECT DISTINCT 相关知识点: 试题来源: 解析 D null 反馈 收藏
In this post, we are going to see how to select distinct values from SQL queries/statements. One of the easiest ways to select distinct values is using the DISTINCT keyword.
SQL SELECTFirstName, LastName, BaseRate, BaseRate *40ASGrossPayFROMDimEmployeeORDERBYLastName; C. Use DISTINCT with SELECT The following example usesDISTINCTto generate a list of all unique titles in theDimEmployeetable. SQL SELECTDISTINCTTitleFROMDimEmployeeORDERBYTitle; ...
SQL Copy SELECT FirstName, LastName, BaseRate, BaseRate * 40 AS GrossPay FROM DimEmployee ORDER BY LastName; C. Use DISTINCT with SELECT The following example uses DISTINCT to generate a list of all unique titles in the DimEmployee table. SQL Copy SELECT DISTINCT Title FROM DimEmployee...
使用CREATE INDEX 语句创建索引,它允许命名索引,指定表及要索引的一列或多列,并指示索引是升序排列还是降序排列。 索引也可以是唯一的,与 UNIQUE 约束类似,在列上或列组合上防止重复条目。 创建索引 CREATE INDEX CREATE INDEX (创建索引)的语法如下: