SQL CASE 语句

发布于 2024-10-30 02:04:52 字数 385 浏览 1 评论 0原文

我的数据库表 PE 和 PER 有两个字段（BIT 数据类型），我需要编写一条 sql case 语句来执行以下任务。

当 PER=0 时则打印“不需要” 当 PER=1 时，检查 PE=0，然后打印“未完成” 当 PE=1 时，打印“已完成”

以下是我尝试过的查询，但该查询不起作用

CASE pc.PER WHEN '0' THEN 'Not Required'
                                    WHEN '1' THEN (CASE pc.PE WHEN '0' THEN 'Not Completed'
                       WHEN '1' THEN 'Completed') end as ab

原文

There are two fields (BIT data type) in my database table PE and PER i need to write a sql case statement to perform the following task.

when PER=0 then print 'Not Required'
when PER=1 then check if PE=0 then print 'Not Completed' when PE=1 print 'Completed'

following is the query i have tried and which is not working

CASE pc.PER WHEN '0' THEN 'Not Required'
                                    WHEN '1' THEN (CASE pc.PE WHEN '0' THEN 'Not Completed'
                       WHEN '1' THEN 'Completed') end as ab

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篱下浅笙歌 2024-11-06 02:04:53

你错过了一个结局。

CASE pc.PER 
    WHEN 0 THEN 'Not Required'
    WHEN 1 THEN 
        CASE pc.PE 
            WHEN 0 THEN 'Not Completed'
            WHEN 1 THEN 'Completed'
        END
END as ab

You are missing an end.

CASE pc.PER 
    WHEN 0 THEN 'Not Required'
    WHEN 1 THEN 
        CASE pc.PE 
            WHEN 0 THEN 'Not Completed'
            WHEN 1 THEN 'Completed'
        END
END as ab

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感情旳空白 2024-11-06 02:04:53

尝试使用以下语句：

CASE WHEN pc.PER =0 THEN 'Not Required'  
     WHEN pc.PER =1 THEN 
         CASE   WHEN pc.PE = 0 THEN 'Not Completed'
                WHEN pc.PE = 1 THEN 'Completed' 
     End 
End as ab

try the following statement instead:

CASE WHEN pc.PER =0 THEN 'Not Required'  
     WHEN pc.PER =1 THEN 
         CASE   WHEN pc.PE = 0 THEN 'Not Completed'
                WHEN pc.PE = 1 THEN 'Completed' 
     End 
End as ab

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未央 2024-11-06 02:04:52

我认为将其写为更容易：

CASE
    WHEN pc.PER = '0' THEN 'Not Required'
    WHEN pc.PER = '1' AND pc.PE = '0' THEN 'Not Completed'
    ELSE 'Completed'
END

或者，您必须在查询中的 ... WHEN '1' THEN 'Completed' 之后添加 END ：

CASE pc.PER WHEN '0' THEN 'Not Required'
            WHEN '1' THEN (CASE pc.PE WHEN '0' THEN 'Not Completed'
                                      WHEN '1' THEN 'Completed'
                           END)
END AS ab

I think it might be easier to write it as:

CASE
    WHEN pc.PER = '0' THEN 'Not Required'
    WHEN pc.PER = '1' AND pc.PE = '0' THEN 'Not Completed'
    ELSE 'Completed'
END

Alternatively you would have to add END after ... WHEN '1' THEN 'Completed' in your query:

CASE pc.PER WHEN '0' THEN 'Not Required'
            WHEN '1' THEN (CASE pc.PE WHEN '0' THEN 'Not Completed'
                                      WHEN '1' THEN 'Completed'
                           END)
END AS ab

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