SQL Where 子句带有 If(或 Case)语句？

Question

我有以下 SQL 语句:

SELECT 
    WORKORDER.WONUM,
    WORKORDER.WO3, 
    WORKORDER.DESCRIPTION WO_DESC, 
    WORKORDER.WORKTYPE, 
    WORKORDER.STATUS, 
    WORKORDER.WOPRIORITY, 
    (case when WORKORDER.CUSTREQ1=1 then 'Yes' else 'No' end) WO18, 
    WORKORDER.REPORTDATE, 
    WORKORDER.ACTFINISH, 
    (WORKORDER.LOCATION + ' ' +LOCATIONS.DESCRIPTION) LOC_DESC
FROM WORKORDER 
    LEFT OUTER JOIN LOCATIONS ON WORKORDER.LOCATION = LOCATIONS.LOCATION 
WHERE 
    WORKORDER.HISTORYFLAG = 0 
    AND WORKORDER.ISTASK = 0 
    AND WORKORDER.STATUS = 'COMP' 
    AND WORKORDER.STATUSDATE >= getdate() - 1 
    AND WORKORDER.LOCATION LIKE 'ABC%'

我想添加一个附加条件(可能在 WHERE 子句中)来启用以下行为:
- 如果工单 WORKTYPE 为“PM”且 WOPRIORITY 为 5，则不要包含它!
- 如果工作订单 WORKTYPE 是其他任何内容，则允许任何优先级

我不确定在 WHERE 子句中放入什么类型的 IF 或 CASE 语句来具体限制优先级 5 PM。非常感谢任何和所有的帮助!提前致谢!

---

我可能找到了解决办法!我已将以下行添加到 WHERE 子句的末尾:

AND (case when WORKORDER.WORKTYPE='PM' then WORKORDER.WOPRIORITY<>5)

Answer 1

我认为你可能想得太仔细了......

WHERE NOT (WorkType = 'PM' AND WOPRIORITY = 5)