Sql 关于特定项目的案例陈述

我无法运行如下所示的查询

select item(id),case statement (on that particular item )
from table( which contains n no. of items)

---

它应该返回每个

id

和该特定

id

的case语句

case

语句在大多数RDBMS中的用法：

SELECT
    id,
    -- Usage one
    CASE [fieldToCheck]
        WHEN [value1] THEN [result if the field equals to value1]
        WHEN [value2] THEN [result if the field equals to value2]
        ELSE [If all the above was false]
    END AS [alias]

    -- Usage two
    CASE
        WHEN fieldToCheck = [value1] THEN [result if the condition is true]
        WHEN fieldToCheck = [value2] THEN [result if the condition is true]
        WHEN fieldToCheck = [value3] THEN [result if the condition is true]
        WHEN fieldToCheck = [value4] OR anotherField = [anotherValue] THEN [result if the condition is true]
        ELSE [If all the above was false]
    END
FROM
    [table]

---

请注意，如果两个条件（在一个

案例中

语句）为真，则仅使用第一个条件

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