SELECT customers.customer_name, orders.order_id FROM customers RIGHT JOIN orders ON customers.customer_id = orders.customer_id; 本例中,orders表为左表,customers表为右表。该customer_id列用于连接表。结果表将包括表中的所有行orders和表中的匹配行customers。如果表中没有匹配项customers,该customer_name列...
Flink SQL> SELECT alan_user_t1.* FROM alan_user_t1 > INNER JOIN alan_user_t2 > ON alan_user_t1.id = alan_user_t2.id > ; +---+---+---+---+ | op | id | name | age | +---+---+---+---+ | +I | 1 | 'alan' | 18 | ...
Select the JOIN condition to use: 2.You JOIN the tablesgoalandeteamin an SQL statement. Indicate the list of column names that may be used in the SELECT line: 3.Select the code which shows players, their team and the amount of goals they scored against Greece(GRE). 4.Select the result...
select * from student stu LEFT JOIN class cl on stu.c_id=cl.Id where stu.Score>80 and cl.`Name`='一班' -- 用一条sql语句查询出各个班级的男生人数和平均分 select count(sex) as '男生人数',avg(Score) as '平均分' from student where sex='男' GROUP BY c_id 查找出name中所有相同的...
The above SELECT statement can also be written as"select first_name from students_details;" You can also retrieve data from more than one column. For example, to select first name and last name of all the students. SELECT first_name, last_name FROM student_details; ...
LEFT JOIN RIGHT JOIN SELECT 1. Introduction Joining twoSELECT statementresults inSQLis a fundamental operation for combining data from multiple tables based on common columns or conditions. In this tutorial, we’ll explore the concept ofSQL joinsstep-by-step, starting with the basics of SELECT s...
The following SQL statement selects all customers, and all orders:SELECT Customers.CustomerName, Orders.OrderID FROM Customers FULL OUTER JOIN Orders ON Customers.CustomerID=Orders.CustomerID ORDER BY Customers.CustomerName; Note: The FULL OUTER JOIN keyword returns all the rows from the left ...
SELECT--C.3o.object_typeAS[Type-of-Item], p.nameAS[Package], o.nameAS[Item], o.descriptionAS[Item-Description]FROMsys.dm_xe_objectsASoJOINsys.dm_xe_packagesASpONo.package_guid = p.guidWHEREo.object_typeIN('action','target','pred_source')AND( (o.capab...
左联接(LEFT JOIN) :满足条件的记录+左边不满足条件的都显示; 右联接(RIGHT JOIN):满足条件的记录+右边不满足条件的都显示; 完全联接(FULL JOIN) :满足条件的记录+左、右边不满足条件的都显示; SQL_SELECT语句的常用格式 SELECT [ ALL/DISTINCT] <目标列表达式> ...
TheSELECTstatement is used to select data from a database. ExampleGet your own SQL Server Return data from the Customers table: SELECTCustomerName, CityFROMCustomers; Try it Yourself » Syntax SELECTcolumn1,column2, ... FROMtable_name; ...