如何在讀取數據時顯示0而不是NULL我的sql表

我正在從mysql表中取數據，但它在兩個字段中顯示NULL爲Status。我想代替NULL顯示0。如何在讀取數據時顯示0而不是NULL我的sql表

這裏是我的查詢：

SELECT ml.GroupID, ml.GroupTitle, ml.GroupDescription, ml.GroupCreatedDateTime, ml.GroupOwnerUserID, ml.ApprovalNeeded, ml.GroupStatus, ml.OrganizationCode, cat.Status 
FROM GroupsMaster AS ml 
LEFT JOIN UserGroupsMapping cat ON cat.GroupID = ml.GroupID 
WHERE ml.OrganizationCode = ?

來源

2013-07-17 user2240329

使用COALESCE操作

COALESCE(cat.Status, 0) 


SELECT 
ml.GroupID, 
ml.GroupTitle, 
ml.GroupDescription, 
ml.GroupCreatedDateTime, 
ml.GroupOwnerUserID, 
ml.ApprovalNeeded, 
ml.GroupStatus, 
ml.OrganizationCode, 
COALESCE(cat.Status, 0) as Status 
FROM GroupsMaster AS ml 
LEFT JOIN UserGroupsMapping cat ON cat.GroupID = ml.GroupID 
WHERE ml.OrganizationCode = 'ibm'

來源

2013-07-17 08:22:07

SELECT ml.GroupID，ml.GroupTitle，ml.GroupDescription，ml.GroupCreatedDateTime，ml.GroupOwnerUserID，ml.ApprovalNeeded，ml.GroupStatus，ml.OrganizationCod e，cat.Status COALESCE（cat.Status，0） FROM GroupsMaster AS ml LEFT JOIN UserGroupsMapping cat ON cat.GroupID = ml.GroupID WHERE ml.OrganizationCode ='ibm' – user2240329

請參閱我的查詢，正如你所說的使用它不起作用 – user2240329

@ user2240329你仍然有一個cat.Status丟失在你的代碼中（和/或缺少逗號）。看到我編輯的答案 –

你可以試試ifnull()功能。像belowing：

選擇IFNULL（cat.status，0）作爲狀態
FROM GroupsMaster AS毫升左連接UserGroupsMapping貓ON cat.GroupID = ml.GroupID WHERE ml.OrganizationCode = '$ organizationCode' 「）;

來源

2013-07-17 08:35:34 pychao

使用此

SELECT 
ml.GroupID, 
ml.GroupTitle, 
ml.GroupDescription, 
ml.GroupCreatedDateTime, 
ml.GroupOwnerUserID, 
ml.ApprovalNeeded, 
ml.GroupStatus, 
ml.OrganizationCode, 
COALESCE(cat.Status, 0) as Status 
FROM GroupsMaster AS ml 
LEFT JOIN UserGroupsMapping cat ON cat.GroupID = ml.GroupID 
and ml.OrganizationCode = 'ibm'

來源

2013-07-17 08:36:44 kabijoy

如何在讀取數據時顯示0而不是NULL我的sql表

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