服务器已返回此错误消息：重复列名称'NULL'MySQL错误

Question

我正在尝试将备份从其他服务器恢复到新服务器，但我收到了此错误：

执行此查询时出错：

CREATE algorithm=undefined definer=root@localhost sql security definer VIEW resellers ASSELECT resellers1.id AS id,
       ( 
              SELECT clienttypes.id_client_type AS id_client_type 
              FROM   clienttypes 
              WHERE  ( 
                            clienttypes.id_client_type = 64)) AS client_type, 
       resellers1.idreseller                                  AS idReseller, 
       resellers1.login                                       AS login, 
       resellers1.password                                    AS password, 
       resellers1.type                                        AS type, 
       resellers1.id_tariff                                   AS id_tariff, 
       resellers1.callslimit                                  AS callsLimit, 
       resellers1.clientslimit                                AS clientsLimit, 
       resellers1.tech_prefix                                 AS tech_prefix, 
       resellers1.identifier                                  AS identifier, 
       resellers1.fullname                                    AS Fullname, 
       resellers1.address                                     AS Address, 
       resellers1.city                                        AS City, 
       resellers1.zipcode                                     AS ZipCode, 
       resellers1.country                                     AS Country, 
       resellers1.phone                                       AS Phone, 
       resellers1.email                                       AS Email, 
       resellers1.maxclients                                  AS MaxClients, 
       resellers1.template_id                                 AS template_id, 
       resellers1.taxid                                       AS TaxID, 
       resellers1.type2                                       AS type2, 
       resellers1.language                                    AS language 
FROM   resellers1 
WHERE  ( 
              NOT( 
                     EXISTS 
                     ( 
                            SELECT clientsshared.id_reseller AS id_reseller 
                            FROM   clientsshared 
                            WHERE  (( 
                                                 clientsshared.id_tariff = -(2)) 
                                   AND    ( 
                                                 resellers1.login = clientsshared.login) 
                                   AND    ( 
                                                 resellers1.password = clientsshared.password)))))
UNION ALL 
SELECT resellers2.id AS id, 
       ( 
              SELECT clienttypes.id_client_type AS id_client_type 
              FROM   clienttypes 
              WHERE  ( 
                            clienttypes.id_client_type = 65)) AS client_type, 
       resellers2.idreseller                                  AS idReseller, 
       resellers2.login                                       AS login, 
       resellers2.password                                    AS password, 
       resellers2.type                                        AS type, 
       resellers2.id_tariff                                   AS id_tariff, 
       resellers2.callslimit                                  AS callsLimit, 
       resellers2.clientslimit                                AS clientsLimit, 
       resellers2.tech_prefix                                 AS tech_prefix, 
       resellers2.identifier                                  AS identifier, 
       resellers2.fullname                                    AS Fullname, 
       resellers2.address                                     AS Address, 
       resellers2.city                                        AS City, 
       resellers2.zipcode                                     AS ZipCode, 
       resellers2.country                                     AS Country, 
       resellers2.phone                                       AS Phone, 
       resellers2.email                                       AS Email, 
       NULL                                                   AS NULL, 
       resellers2.template_id                                 AS template_id, 
       resellers2.taxid                                       AS TaxID, 
       resellers2.type2                                       AS type2, 
       resellers2.language                                    AS language 
FROM   resellers2 
UNION ALL 
SELECT resellers3.id AS id, 
       ( 
              SELECT clienttypes.id_client_type AS id_client_type 
              FROM   clienttypes 
              WHERE  ( 
                            clienttypes.id_client_type = 66)) AS client_type, 
       NULL                                                   AS NULL, 
       resellers3.login                                       AS login, 
       resellers3.password                                    AS password, 
       resellers3.type                                        AS type, 
       resellers3.id_tariff                                   AS id_tariff, 
       resellers3.callslimit                                  AS callsLimit, 
       resellers3.clientslimit                                AS clientsLimit, 
       resellers3.tech_prefix                                 AS tech_prefix, 
       resellers3.identifier                                  AS identifier, 
       resellers3.fullname                                    AS Fullname, 
       resellers3.address                                     AS Address, 
       resellers3.city                                        AS City, 
       resellers3.zipcode                                     AS ZipCode, 
       resellers3.country                                     AS Country, 
       resellers3.phone                                       AS Phone, 
       resellers3.email                                       AS Email, 
       NULL                                                   AS NULL, 
       NULL                                                   AS NULL, 
       resellers3.taxid                                       AS TaxID, 
       resellers3.type2                                       AS type2, 
       resellers3.language                                    AS language 
FROM   resellers3;

服务器已返回此错误消息：

  

重复列名'NULL'
  MySQL错误。

任何想法是什么问题以及如何解决它？

Answer 1

在您的SQL语句中，您有三次NULL AS NULL，这是不正确的。

where (clienttypes.id_client_type = 66)) AS client_type,NULL AS NULL,resellers3.login AS login

Email AS Email,NULL AS NULL,NULL AS NULL,resellers3.TaxID AS TaxID

有几个问题。 NULL不可能是列名，您不能使用相同的别名定义多个列。