FULL OUTER JOIN TheFULL OUTER JOINcommand returns all rows when there is a match in either left table or right table. The following SQL statement selects all customers, and all orders: SELECTCustomers.CustomerName, Orders.OrderID FROMCustomers...
SQL FULL OUTER JOIN关键字在左表(table1)或右表(table2)记录中有匹配时返回所有记录。 FULL OUTER JOIN语法 代码语言:SQL 复制 SELECTcolumn_name(s)FROMtable1FULLOUTERJOINtable2ONtable1.column_name=table2.column_nameWHEREcondition; 注意:FULL OUTER JOIN和FULL JOIN是相同的。FULL OUTER JOIN可能返回非常...
SQL FULL OUTER JOIN示例 以下SQL语句选择所有客户和所有订单: SELECTCustomers.CustomerName, Orders.OrderID FROMCustomers FULLOUTERJOINOrdersONCustomers.CustomerID=Orders.CustomerID ORDERBYCustomers.CustomerName; 结果集的一部分可能如下所示: 注意:FULL OUTER JOIN关键字返回两个表中所有匹配的记录,无论另一表是...
左外联合(left outer join) 生成表A的所有记录,包括在表B里匹配的记录。如果没有匹配的,右边将是null。(如下图) Left outer join 代码语言:javascript 复制 SELECT*FROMTableALEFTOUTERJOINTableBONTableA.name=TableB.name id name id name---1Pirate2Pirate2Monkeynullnull3Ninja4Ninja4Spaghettinullnull 为了...
--全外连接full join/full outer joinselect*fromA1select*fromA2--下面2句的结果一样:select*fromA1fulljoinA2ONA1.ID=A2.ID--A1的栏位显示在前面select*fromA1fullouterjoinA2ONA1.ID=A2.ID--A1的栏位显示在前面--select * from A2 full join A1 ON A1.ID=A2.ID --A2的栏位显示在前面/*最后这...
SQL将外部联合分为了右外部联合(right outer join)、左外部联合(left outer join)、完全外部联合(full outer join)3个类型。 左外部联合:LEFT OUTER JOIN 基本语法:SELECT column_list FROM table1 LEFT OUTER JOIN table2 ON condition 思想:OUTER JOIN语句表1中的所有记录都被返回在结果中,即使表2没有匹配的...
简介: SQL将外部联合分为了右外部联合(right outer join)、左外部联合(left outer join)、完全外部联合(full outer join)3个类型。SQL将外部联合分为了右外部联合(right outer join)、左外部联合(left outer join)、完全外部联合(full outer join)3个类型。 左外部联合:LEFT OUTER JOIN 基本语法:SELECT column...
SQL FULL OUTER JOIN 关键字 SQL FULL OUTER JOIN 关键字 FULL OUTER JOIN 关键字只要左表(table1)和右表(table2)其中一个表中存在匹配,则返回行. FULL OUTER JOIN 关键字结合了 LEFT JOIN 和 RIGHT JOIN 的结果。 SQL FULL OUTER JOIN 语法 SELECT column_name(s)
SQL FULL OUTER JOIN关键字在左表(table1)或右表(table2)记录中有匹配时返回所有记录。 FULL OUTER JOIN语法 SELECTcolumn_name(s) FROMtable1 FULLOUTERJOINtable2 ONtable1.column_name=table2.column_name WHEREcondition; 注意:FULL OUTER JOIN和FULL JOIN是相同的。FULL OUTER JOIN可能返回非常大的结果集!
Example: SQL OUTER Join SELECT Customers.customer_id, Customers.first_name, Orders.amount FROM Customers FULL OUTER JOIN Orders ON Customers.customer_id = Orders.customer; Here, the SQL command selects the customer_id and first_name columns (from the Customers table) and the amount column (fro...