MYSQL If条件如果then值为0则不显示

我的问题是

SELECT
    mm.module_id, mm.module_name,
    pm.permission_id, pm.permission_name,
    CASE WHEN rp.permission_id is not null
        THEN false ELSE true END AS status
FROM permission_master AS pm 
LEFT OUTER JOIN role_permission AS rp
    ON pm.permission_id = rp.permission_id AND rp.RoleID = 1
LEFT OUTER JOIN module_master AS mm
    ON pm.module_id = mm.module_id
ORDER BY mm.module_id, pm.permission_id

它返回值，根据查询中的给定条件，状态将为0和1。

我需要的是它不应该返回状态为0的冒号

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我该怎么做？

您可以在查询中添加where子句，如下所示

select mm.module_id, mm.module_name, pm.permission_id, 
pm.permission_name, 
case when rp.permission_id is not null then false else true end as status 
from permission_master as pm 
left outer join role_permission as rp on pm.permission_id = rp.permission_id 
and rp.RoleID = 1 
left outer join module_master as mm on pm.module_id = mm.module_id 
where rp.permission_id is null
order by mm.module_id, pm.permission_id

---

您只需将having子句添加为

在order by子句之前具有status=1

select
mm.module_id, 
mm.module_name, 
pm.permission_id, 
pm.permission_name, 
case 
when rp.permission_id is not null then false 
else true 
end as status 
from permission_master as pm 
left outer join role_permission as rp on pm.permission_id = rp.permission_id and rp.RoleID = 1 
left outer join module_master as mm on pm.module_id = mm.module_id 
having status = 1
order by mm.module_id, pm.permission_id

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如果您不想显示0状态，则在order by子句之前添加

having status=1

。。它工作得很好！！请发布要接受的答案：）