三、右连接(右外连接) 关键字:right join on / right outer join on 语句:select * from a_table a right outer join b_table b on a.a_id = b.b_id; 执行结果: 说明: right join是right outer join的简写,它的全称是右外连接,是外连接中的一种。 与左(外)连接相反,右(外)连接,左表(a_tabl...
In this article, I provide a quick overview of using the right and left functions in SQL Server with some code examples. The examples are developed in SQL Server using the SQL Server Management Studio. So let's look at a practical example of using the right and left functions in SQL Serv...
--自然连接 select * from table1 natural left join table2 select * from table1 natural right join table2 select * from table1 natural join table2 2.Join连接过程 连接操作的本质就是把各个连接表中的记录都取出来依次匹配的组合加入结果集并返回给用户。如果没有任何限制条件的话,多表联接起来产生的笛...
To access SQL Commands: Log in to the Workspace home page. The Workspace home page appears. To view the SQL Commands home page you can either: ClickSQL Workshopand thenSQL Commandsto drill-down to the SQL Commands home page. Click the down arrow on the right side of the SQL Workshop ...
All the columns of the first (left) table that are not specified in the USING clause All the columns of the second (right) table that are not specified in the USING clause Examples SELECT * FROM COUNTRIES JOIN CITIES USING (COUNTRY); SELECT * FROM COUNTRIES JOIN CITIES USING (COUNTRY, CO...
Create.ClickCreateto create a script in the Script Editor. See"Creating a SQL Script". Switching to Another SQL Workshop Component You can navigate to another SQL Workshop component by making a selection from the Component list located on the upper right side of the page: ...
right join dept on dept.id=teacher.dept group by dept.name; Use CASE to show thenameof each teacher followed by ‘Sci’ if the teacher is indept1 or 2 and ‘Art’ otherwise. 代码语言:javascript 代码运行次数:0 运行 AI代码解释 select teacher.name,casewhen(teacher.dept=1or teacher.dept=...
Right-click your server instance in Object Explorer, and then select New Query: Paste the following T-SQL code snippet into the query window: SQL Copy USE master GO IF NOT EXISTS ( SELECT name FROM sys.databases WHERE name = N'TutorialDB' ) CREATE DATABASE [TutorialDB] GO Execute the...
Answer: A. The LPAD(string, num, char) and RPAD(string, num, char) functions add a character to the left or right of a given string until it reaches the specified length (num) after padding. The ROUND function rounds the value 78945.45 to 78945 and then pads it with '*' until ...
Right-click your server instance in Object Explorer, and then selectNew Query: Paste the following T-SQL code snippet into the query window: SQL USEmasterGOIFNOTEXISTS(SELECTnameFROMsys.databasesWHEREname= N'TutorialDB')CREATEDATABASE[TutorialDB]GO ...