case when 使用or

CASE WHEN...THEN...END 是SQL中一种常用的条件表达式，用于实现条件逻辑。使用OR关键字在CASE WHEN结构中，可以组合多个条件，当任何一个条件满足时，相应的THEN部分的值就会被返回。

一个基本的CASE WHEN结构中使用OR的例子如下：

SELECT
  CASE 
    WHEN condition1 OR condition2 THEN 'Result1'
    WHEN condition3 THEN 'Result2'
    ELSE 'DefaultResult'
  END
FROM table_name;

在这个例子中，如果`condition1`或`condition2`中的任何一个为真（TRUE），那么CASE表达式的结果就是'Result1'。只有当这两个条件都不满足时，才会继续检查`condition3`。如果所有条件都不满足，最后的结果将是'DefaultResult'。

相关问题

case when 条件 or使用

引用\[1\]中提到了使用CASE WHEN语句时，可以使用OR来连接多个条件。例如，可以使用以下语法来实现条件或的效果：

CASE
WHEN condition1 OR condition2 THEN result1
WHEN condition3 THEN result2
ELSE result3
END

其中，condition1和condition2是要判断的条件，result1是满足条件1或条件2时的结果，condition3是要判断的第二个条件，result2是满足条件3时的结果，result3是其他情况下的结果。

这样，当满足条件1或条件2时，会返回result1；当满足条件3时，会返回result2；其他情况下，会返回result3。

请注意，条件之间使用OR时，只要有一个条件满足就会执行对应的结果。如果需要同时满足多个条件，可以使用AND来连接条件。

希望这个回答对您有帮助！
#### 引用[.reference_title]
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case when and or

CASE WHEN and OR are two different logical operators in SQL.

CASE WHEN is used to evaluate a condition and return a value based on that condition. It is typically used in a SELECT statement to create a new column with custom values based on certain conditions. The syntax is as follows:

CASE
    WHEN condition1 THEN result1
    WHEN condition2 THEN result2
    ELSE result3
END

For example, if we want to create a new column called "age_group" based on the age of a person, we could use the following code:

SELECT name, age,
    CASE
        WHEN age < 18 THEN 'Under 18'
        WHEN age >= 18 AND age < 30 THEN '18-29'
        WHEN age >= 30 AND age < 50 THEN '30-49'
        ELSE '50 and over'
    END AS age_group
FROM people;

OR is used to combine multiple conditions in a WHERE or HAVING clause. It returns true if any of the conditions are true. The syntax is as follows:

SELECT *
FROM table
WHERE condition1 OR condition2;

For example, if we want to select all the records from a table where the age is either less than 18 or greater than 65, we could use the following code:

SELECT *
FROM people
WHERE age < 18 OR age > 65;