從多個表中選擇不重複

我有5個表中的複雜選擇語句，我想避免具有與其中一個表具有相同字段值的重複行。從多個表中選擇不重複

SELECT role_enname 
      ,lu_app_operations.operation_enname 
      , lu_applications.app_enname 
      , lu_app_oper_groups.oper_group_enname 
FROM app_operation_roles 
     ,roles 
     ,lu_app_operations 
     ,lu_applications 
     ,lu_app_oper_groups 
WHERE app_operation_roles.role_id=roles.role_id 
AND app_operation_roles.app_operation_id=lu_app_operations.app_operation_id 
AND roles.app_id=lu_applications.app_id 
AND lu_app_operations.app_oper_group_id=lu_app_oper_groups.app_oper_group_id 
AND app_operation_roles.retired =0 
AND roles.retired    =0

在此查詢我不基於lu_app_operations.operation_enname

來源

2013-08-21 Ayman Salah

使用DISTINCT關鍵字顯示重複行：

SELECT DISTINCT role_enname, <rest of your query>

來源

2013-08-21 05:40:49 Bohemian

使用不同的關鍵字如下

SELECT DISTINCT role_enname,lu_app_operations.operation_enname, lu_applications.app_enname, 
lu_app_oper_groups.oper_group_enname 
FROM app_operation_roles,roles,lu_app_operations,lu_applications,lu_app_oper_groups 
WHERE app_operation_roles.role_id=roles.role_id 
AND app_operation_roles.app_operation_id=lu_app_operations.app_operation_id 
AND roles.app_id=lu_applications.app_id 
AND lu_app_operations.app_oper_group_id=lu_app_oper_groups.app_oper_group_id 
AND app_operation_roles.retired =0 AND roles.retired    =0

來源

2013-08-21 05:51:04 SpringLearner

也許你可以使用Distinct和Group by來獲得結果，但請記住，加入多個表格，最好的辦法是仍然使用JOIN代替AND

SELECT DISTINCT role_enname 
     ,lu_app_operations.operation_enname 
     , lu_applications.app_enname 
     , lu_app_oper_groups.oper_group_enname 
FROM app_operation_roles 
,roles 
,lu_app_operations 
,lu_applications 
,lu_app_oper_groups 
WHERE app_operation_roles.role_id=roles.role_id 
AND app_operation_roles.app_operation_id=lu_app_operations.app_operation_id 
AND roles.app_id=lu_applications.app_id 
AND lu_app_operations.app_oper_group_id=lu_app_oper_groups.app_oper_group_id 
AND app_operation_roles.retired =0 
AND roles.retired    =0 
GROUP BY role_enname, 
lu_app_operations.operation_enname, 
lu_applications.app_enname, 
lu_app_oper_groups.oper_group_enname

來源

2013-08-21 06:03:03

SELECT distinct role_enname,lu_app_operations.operation_enname, lu_applications.app_enname,lu_app_oper_groups.oper_group_enname 
FROM app_operation_roles,roles,lu_app_operations,lu_applications,lu_app_oper_groups 
WHERE app_operation_roles.role_id=roles.role_id 
AND app_operation_roles.app_operation_id=lu_app_operations.app_operation_id 
AND roles.app_id=lu_applications.app_id 
AND lu_app_operations.app_oper_group_id=lu_app_oper_groups.app_oper_group_id 
AND app_operation_roles.retired =0 
AND roles.retired =0

來源

2013-08-21 06:06:04

從多個表中選擇不重複

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