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修复部分失效链接

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luoxiang
2019-07-31 22:27:25 +08:00
parent f6084a8851
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notes/Hive数据查询详解.md
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@ -251,8 +251,6 @@ Hive 支持内连接，外连接，左外连接，右外连接，笛卡尔连接
<div align="center"> <img width="600px" src="https://github.com/heibaiying/BigData-Notes/blob/master/pictures/sql-join.jpg"/> </div>
### 3.1 INNER JOIN
```sql
@ -289,7 +287,6 @@ ON e.deptno = d.deptno;
执行右连接后，由于 40 号部门下没有任何员工，所以此时员工信息为 NULL。这个查询可以很好的复述上面提到的——JOIN 语句的关联条件必须用 ON 指定，不能用 WHERE 指定。你可以把 ON 改成 WHERE，你会发现无论如何都查不出 40 号部门这条数据，因为笛卡尔运算不会有 (NULL, 40) 这种情况。
<div align="center"> <img width="700px" src="https://github.com/heibaiying/BigData-Notes/blob/master/pictures/hive-right-join.png"/> </div>
### 3.4 FULL OUTER JOIN
```sql
@ -394,14 +391,6 @@ SET hive.exec.mode.local.auto=true;
## 参考资料
1. [LanguageManual Select](https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Select)
2. [LanguageManual Joins](https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Joins)
3. [LanguageManual GroupBy](https://cwiki.apache.org/confluence/display/Hive/LanguageManual+GroupBy)
4. [LanguageManual SortBy](https://cwiki.apache.org/confluence/display/Hive/LanguageManual+SortBy)
4. [LanguageManual SortBy](https://cwiki.apache.org/confluence/display/Hive/LanguageManual+SortBy)