GroupBy 用于聚合数据,而 OrderBy 用于排序数据。GroupBy 返回组,而 OrderBy 返回排序后的行。GroupBy 可以包含聚合函数,而 OrderBy 可以包含常规列。
GroupBy 与 OrderBy 在 SQL 中的区别
GroupBy
<code class="sql">SELECT column_name(s) FROM table_name GROUP BY column_name</code>
OrderBy
<code class="sql">SELECT column_name(s) FROM table_name ORDER BY column_name [ASC | DESC]</code>
区别
示例
假设有一张名为 "Sales" 的表,其中包含以下数据:
Product | Sales |
---|---|
Apple | 100 |
Banana | 50 |
Apple | 75 |
Banana | 25 |
Orange | 120 |
GroupBy 示例:
<code class="sql">SELECT Product, SUM(Sales) AS TotalSales FROM Sales GROUP BY Product;</code>
结果:
Product | TotalSales |
---|---|
Apple | 175 |
Banana | 75 |
Orange | 120 |
OrderBy 示例:
<code class="sql">SELECT * FROM Sales ORDER BY Sales DESC;</code>
结果(按销量降序排序):
Product | Sales |
---|---|
Orange | 120 |
Apple | 100 |
Apple | 75 |
Banana | 50 |
Banana | 25 |
以上是sql中groupby和orderby区别的详细内容。更多信息请关注PHP中文网其他相关文章!