SQL标签报错：缺少属性 sql 值的原因与解决方法

在模板中使用SQL标签时，报错“缺少属性 sql 值”通常是由于模板语法不正确或SQL语句格式问题导致的。以下是详细原因及解决方法。

检查SQL语句格式
- 确保SQL语句在模板中正确书写，避免语法错误。
- 示例：
```
 
```
  sql
  
  SELECT author, COUNT(*) AS count, (@rank := @rank + 1) AS rank FROM __PREFIX__archives, (SELECT @rank := 0) r WHERE author != 'admin' GROUP BY author ORDER BY count DESC;
检查模板语法
- 确保SQL标签的语法正确，属性值用双引号包裹。
- 示例：
```
 
```
  html
  
  {eyou:sql sql="SELECT author, COUNT(*) AS count, (@rank := @rank + 1) AS rank FROM __PREFIX__archives, (SELECT @rank := 0) r WHERE author != 'admin' GROUP BY author ORDER BY count DESC;"} 排名：{$field.rank} 用户：{$field.author} 上稿：{$field.count} {/eyou:sql}
转义特殊字符
- 如果SQL语句中包含双引号或单引号，确保其正确转义。
- 示例：
```
 
```
  html
  
  {eyou:sql sql="SELECT author, COUNT(*) AS count, (@rank := @rank + 1) AS rank FROM __PREFIX__archives, (SELECT @rank := 0) r WHERE author != 'admin' GROUP BY author ORDER BY count DESC;"} 排名：{$field.rank} 用户：{$field.author} 上稿：{$field.count} {/eyou:sql}