case when not in
时间: 2023-08-27 14:19:47 浏览: 45
要在 CASE WHEN 语句中使用 NOT IN 条件,您可以按以下方式编写代码:
```sql
SELECT column_name,
CASE
WHEN column_name NOT IN ('value1', 'value2', 'value3') THEN 'Not In'
ELSE 'In'
END AS result
FROM table_name;
```
在上述代码中,您需要根据实际情况进行调整。column_name 是要进行条件判断的列名,('value1', 'value2', 'value3') 是要排除的值的列表,table_name 是要从中查询数据的表名。
在 CASE WHEN 结构中,使用 NOT IN 条件可以判断列值是否不包含在指定的值列表中。如果列值不在列表中,返回 "Not In";否则返回 "In"。
请注意,'value1', 'value2', 'value3' 是您要排除的特定值。您可以根据需要调整这些值或使用其他条件。
希望对您有所帮助!如果您有任何其他问题,请随时提问。
相关问题
使用case when not in
好的,我明白了。针对您的问题,可以使用以下语法实现:
```
SELECT column_name,
CASE WHEN column_name NOT IN (value1, value2, ...) THEN 'Other'
ELSE column_name
END
FROM table_name;
```
其中,`column_name`是要进行判断的列名,`value1, value2, ...`是不包含在判断范围内的值,`Other`是当列值不在判断范围内时的替代值。
case when sql
CASE WHEN is a conditional statement in SQL that allows you to perform different actions based on specified conditions. It is typically used in conjunction with the SELECT statement to add conditional logic to the result set.
Here's an example of how you can use the CASE WHEN statement in SQL:
```sql
SELECT column1, column2,
CASE
WHEN condition1 THEN result1
WHEN condition2 THEN result2
ELSE result3
END AS alias
FROM your_table;
```
In this example, you specify the conditions and corresponding results within the CASE WHEN statement. If condition1 is true, it will return result1. If condition2 is true, it will return result2. If none of the conditions are true, it will return result3.
You can also use the CASE WHEN statement without any conditions, which acts like an IF-ELSE statement:
```sql
SELECT column1, column2,
CASE
WHEN value = 1 THEN 'One'
ELSE 'Not One'
END AS alias
FROM your_table;
```
In this case, if the value is equal to 1, it will return 'One'. Otherwise, it will return 'Not One'.