name 'abcde' is not defined
时间: 2023-09-30 14:03:59 浏览: 31
This error message usually means that you are trying to use a variable or function named 'abcde' that has not been defined in your code. Make sure that you have properly defined the variable or function before using it. If you're still having trouble, try checking for typos or syntax errors in your code.
相关问题
用Python输出ABCDE
要用Python输出ABCDE,可以使用循环和字符串拼接的方式来实现。以下是一种可能的实现方式:
```python
output = ""
for char in "ABCDE":
output += char
print(output)
```
这段代码会依次遍历字符串"ABCDE"中的每个字符,然后将字符拼接到一个空字符串`output`中。最后,通过`print`函数将拼接好的字符串输出到控制台。
sql中not like
在SQL中,NOT LIKE是LIKE操作符的否定用法。如果LIKE匹配结果为true,则NOT LIKE的匹配结果为false,反之亦然。当然,前提是要排除null值的情况,因为null的结果始终为null。比如:
- Hive中的示例:
- `select 'abcde' like 'abc';` 结果为 false
- `select not 'abcde' like 'abc';` 结果为 true
- `select 'abcde' not like 'abc';` 结果为 true
- `select null like '%';` 结果为 NULL
- `select not null like '%';` 结果为 NULL
- `select null not like '%';` 结果为 NULL
- 另一个示例:
- `select 1 from t_fin_demo where NOT 'football' like 'fff%';` 结果为 1
- `select 1 from t_fin_demo where 'football' not like 'fff%';` 结果为 1
- `select 1 from t_fin_demo where 'football' like 'fff%';` 结果为 0
需要注意的是,当字符串A或字符串B为NULL时,结果也会是NULL。除了IS NULL和IS NOT NULL以外,其他关系运算符在遇到NULL值时,结果都是返回NULL,而不是TRUE或FALSE。<span class="em">1</span><span class="em">2</span><span class="em">3</span><span class="em">4</span>