Question

我有一个表格，其中包含字段student_number和已完成或未完成的已完成标记。

我正在寻找一个where子句，它允许我检查选择是否有3个学生编号，并检查他们是否已在完成的字段中完成，但所有必须匹配。

知道如何判断这个吗？

Answer 1

可能你想要这样的东西：

where STUDENT.NUMBER in (34646, 57858, 48482) and COMPLETED = 'COMPLETED'

（基于你的评论）

Answer 2

    DROP TABLE T;
    CREATE TABLE T (ID INT, COMPLETED VARCHAR(20))
    INSERT INTO T VALUES
    (34646, 'COMPLETD'),(57858,'COMPLETeD'),(48482,'COMPLETED')

    SELECT case when s.sta > 0 then 'NotAllCompleted'
            else 'AllCompleted'
            end
     FROM   
    (
    SELECT SUM(CASE WHEN COMPLETED <> 'COMPLETED' AND ID IN(34646,57858,48482) THEN 1 ELSE 0 END) sta 
    FROM T
    ) S

---------------
NotAllCompleted

(1 rows affected)

truncate table t
INSERT INTO T VALUES
(34646, 'COMPLETeD'),(57858,'COMPLETeD'),(48482,'COMPLETED')
    SELECT case when s.sta > 0 then 'NotAllCompleted'
            else 'AllCompleted'
            end
     FROM   
    (
    SELECT SUM(CASE WHEN COMPLETED <> 'COMPLETED' AND ID IN(34646,57858,48482) THEN 1 ELSE 0 END) sta 
    FROM T
    ) S
---------------
AllCompleted

(1 rows affected)

where子句测试所有必须匹配的地方

2 个答案: