orcle full join
时间: 2023-10-20 14:02:32 浏览: 85
Oracle does not have a specific "FULL JOIN" operator like some other database systems. However, you can achieve the same result by combining a left join and a right join with a union. Here's an example:
```
SELECT *
FROM table1
LEFT JOIN table2
ON table1.column = table2.column
UNION
SELECT *
FROM table1
RIGHT JOIN table2
ON table1.column = table2.column;
```
In this example, the left join retrieves all matching rows from the left table (table1) and the right join retrieves all matching rows from the right table (table2). The union operator combines the result sets of both joins to give you the equivalent of a full join.
相关问题
oracle full join
Oracle数据库中的FULL JOIN是一种关联查询操作,它返回两个表中的所有记录,包括匹配和不匹配的记录。
FULL JOIN语法如下:
```sql
SELECT column_name(s)
FROM table1
FULL JOIN table2
ON table1.column_name = table2.column_name;
```
在这个查询中,table1和table2是要关联的两个表,ON子句指定了关联条件。FULL JOIN将返回table1和table2中所有满足关联条件的记录,如果没有匹配的记录,则显示NULL。
注意:Oracle数据库也支持使用(+)符号进行外连接操作,它可以模拟FULL JOIN的功能。例如:
```sql
SELECT column_name(s)
FROM table1, table2
WHERE table1.column_name(+) = table2.column_name;
```
这个查询将返回table1和table2中所有的记录,如果没有匹配的记录,则显示NULL。
希望这能回答你的问题!如果有其他问题,请随时提问。
oracle full join用法
Oracle的FULL JOIN用于将两个表中的所有行都连接起来,包括左表和右表中没有匹配的行。FULL JOIN返回的结果集中,左表和右表中没有匹配的行将会用NULL值填充。FULL JOIN语法如下:
SELECT column_name(s)
FROM table1
FULL JOIN table2
ON table1.column_name = table2.column_name;
其中,table1和table2是要连接的两个表,column_name是要连接的列名。FULL JOIN需要使用ON关键字指定连接条件。
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