In what order must property values appear in the list of a font property?
时间: 2023-11-22 21:56:24 浏览: 39
The font property is a shorthand property in CSS that allows you to set several font-related properties at once. The order of the property values in the list of a font property is as follows:
1. font-style
2. font-variant
3. font-weight
4. font-size/line-height
5. font-family
For example, the following code sets the font style to italic, the font weight to bold, the font size to 16 pixels and the font family to Times New Roman:
```
font: italic bold 16px/1.5 'Times New Roman', serif;
```
相关问题
What is the format of a document-level style sheet, and where does the sheet appear?
A document-level style sheet is written in CSS (Cascading Style Sheets) and is used to define the visual appearance and layout of a web page. It includes rules that specify how HTML elements should be displayed, such as font size, color, background color, and spacing.
The format of a document-level style sheet is as follows:
```
<!DOCTYPE html>
<html>
<head>
<style>
/* CSS rules go here */
</style>
</head>
<body>
<!-- HTML content goes here -->
</body>
</html>
```
The `<style>` tag is used to enclose the CSS rules, which are written between curly braces `{}`. The rules are written in the form of `property: value` pairs, and each rule is separated by a semicolon `;`.
The document-level style sheet appears within the `<head>` section of an HTML document, between the `<head>` and `</head>` tags. This ensures that the styles are loaded before the content of the page, allowing the browser to display the content in the correct style.
must appear in the GROUP BY clause or be used in an aggregate function
这个错误提示"must appear in the GROUP BY clause or be used in an aggregate function"是pgsql中一个常见的聚合问题。在SQL3标准以前,选择显示的字段必须出现在GROUP BY子句中。所以在你的查询语句中,如果你想要使用cost字段,你需要将它添加到GROUP BY子句中或者在聚合函数中使用它。\[1\]
对于你提供的第二个例子,如果你想要按照user_name进行分组,并计算每个用户的花费总和,你可以使用SUM函数来实现。你的查询语句可以修改为:
SELECT user_name, SUM(cost) FROM t_cost GROUP BY user_name;
这样就可以得到每个用户的花费总和了。\[2\]
对于你提供的第三个例子,查询语句中使用了子查询和左连接。子查询中使用了聚合函数MAX来计算每个cname的平均值的最大值,然后通过左连接将结果与makerar表进行连接。\[3\]
希望以上解释能够帮助你理解这个错误和如何解决它。如果还有其他问题,请随时提问。
#### 引用[.reference_title]
- *1* *3* [pgsql报错 must appear in the GROUP BY clause or be used in an aggregate function](https://blog.csdn.net/Programmer_FuQiang/article/details/110483490)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^control_2,239^v3^insert_chatgpt"}} ] [.reference_item]
- *2* [Postgresql聚合报错:column XXX must appear in the GROUP BY clause or be used in an aggregate function](https://blog.csdn.net/qq_42647903/article/details/127979751)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^control_2,239^v3^insert_chatgpt"}} ] [.reference_item]
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