sql注入语句示例大全

GROUP BY gives us a way to combine rows and aggregate data.

GROUP BY为我们提供了一种合并行和汇总数据的方法。

The data used is from the campaign contributions data we’ve been using in some of these guides.

使用的数据来自我们在其中一些指南中一直使用的广告系列贡献数据。

The following SQL statement is answering the question: “which candidates received the largest total contributions in 2016 BUT only those that had more than $20 Million USD?”

以下SQL语句回答了这个问题：“哪些候选人在2016年BUT中获得的捐款最多，只有那些收入超过2000万美元的候选人？”

Ordering this data set in a descending (DESC) order places the candidates with the largest total contributions at the top of the list.

按降序(DESC)排序此数据集，将总贡献最大的候选者放在列表的顶部。

SELECT Candidate, Election_year, sum(Total_$), count(*)
FROM combined_party_data
WHERE Election_year = 2016
GROUP BY Candidate, Election_year -- this tells the DBMS to summarize by these two columns
HAVING sum(Total_$) > 20000000  -- limits the rows presented from the summary of money ($20 Million USD)
ORDER BY sum(Total_$) DESC; -- orders the presented rows with the largest ones first.

+--------------------------------------------------+---------------+-------------------+----------+
| Candidate                                        | Election_year | sum(Total_$)      | count(*) |
+--------------------------------------------------+---------------+-------------------+----------+
| CLINTON, HILLARY RODHAM & KAINE, TIMOTHY M (TIM) |          2016 | 568135094.4400003 |      126 |
| TRUMP, DONALD J & PENCE, MICHAEL R (MIKE)        |          2016 | 366853142.7899999 |      114 |
| SANDERS, BERNARD (BERNIE)                        |          2016 |      258562022.17 |      122 |
| CRUZ, RAFAEL EDWARD (TED)                        |          2016 | 93430700.29000005 |      104 |
| CARSON, BENJAMIN S (BEN)                         |          2016 | 62202411.12999996 |       93 |
| RUBIO, MARCO ANTONIO                             |          2016 |        44384313.9 |      106 |
| BUSH, JOHN ELLIS (JEB)                           |          2016 |       34606731.78 |       97 |
+--------------------------------------------------+---------------+-------------------+----------+
7 rows in set (0.01 sec)

As with all of these SQL things there is MUCH MORE to them than what’s in this introductory guide.

与所有这些SQL事物一样，它们比本入门指南中的内容要多得多。

I hope this at least gives you enough to get started.

我希望这至少能给您足够的入门。

Please see the manual for your database manager and have fun trying different options yourself.

请参阅数据库管理员的手册，并尝试自己尝试其他选项，这很有趣。

翻译自: https://www.freecodecamp.org/news/the-sql-group-by-statement-explained-with-example-syntax/

sql注入语句示例大全