Question

要测试这些查询，我在Microsoft Access的SQL查询向导中运行它们。我正在尝试修改现有的php文件，以便在顶部显示高优先级状态警报（O和P），然后由opslogid按降序排序。在没有O和P状态警报之后，我想显示其余的状态警报（A，I，R），由opslogid以降序排序。这是样本数据和所需输出：

tblOpslog

opslogid = 9999, 9998, etc.

status = R, O, I, A, P

opslogid                               status

9999                                       P

9996                                       P

9994                                       O

9991                                       O

9998                                       I

9997                                       I

9980                                       A

9979                                       A

9978                                       A

9930                                       R

9928                                       R

我的同事建议我使用union all命令，这导致我提出这个：

注意：“WHERE DELETED AND NO VIEW MUST REMAIN IN QUERY, IT IS VITAL IN THE OUTPUT OF THE DATABASE”。我也无法对数据库本身进行任何更改。

select * from (SELECT * FROM tblOpslog
Where Deleted = No AND Noview = No AND status in ('O','P'))
union all
select * from (Select * FROM tblOpslog Where Deleted = No AND Noview = No AND status in ('I','R', 'A'))
Order by status, opslogid DESC;

这个输出是：

opslogid                               status

9980                                       A

9979                                       A

9978                                       A

9998                                       I

9997                                       I

9994                                       O

9991                                       O

9999                                       P

9996                                       P

9930                                       R

9928                                       R

我也试过这段代码：

SELECT *
FROM tblOpsLog
WHERE Deleted = No AND Noview = No AND status IN ('A', 'I', 'R', 'O', 'P')
ORDER BY CASE WHEN status IN ('O', 'P') then 1
              ELSE 2
         END, opslogid DESC

这给了我这个错误：

Syntax error (missing oeprator) in query expression 'CASE WHEN status IN ('O','P') then 1 ELSE 2 End'.

如果有人可以建议修复/添加代码以显示所需的输出，我真的很感激吗？谢谢

Answer 1

您正在使用不支持case语句的Access。使用Access语法试用此版本：

SELECT *
FROM tblOpsLog
WHERE Deleted = No AND Noview = No AND status IN ('A', 'I', 'R', 'O', 'P')
ORDER BY iif(status IN ('O', 'P'), 1, 2),
         opslogid DESC

Answer 2

试试这个：

SELECT * FROM tblOpsLog WHERE Deleted = No AND Noview = No 
AND status IN ('A', 'I', 'R', 'O', 'P')
ORDER BY CASE status WHEN 'P' then 1
WHEN 'O' then 1
ELSE 2
END, opslogid DESC

联合全部后排序或按案例排序时

2 个答案: