MySql每个派生表都必须有自己的别名。即使所有人都有

在上面的sql中，我得到了一个错误：

/*sql错误（1248）：每个派生表都必须有自己的别名*/

，即使我的所有派生表都有别名。没有围绕主sql的更新，一切正常。但是当我添加一个更新时，我得到了这个错误

最终结果是使用选择菜单中的

rank

更新列

rank

。只是更新带来了问题。里面有很大的选择是好的

这是下表，这是一份包含一些数据的表格

主表

UPDATE  likesd a
    INNER JOIN (
select id, perCent, rank
from
(
    select id, perCent, elmTotals 
    , @curRank :=   
        case 
           when @prevParent = parent then
               case 
                   when @prevCent = perCent then @curRank
                   else @curRank + 1
               end
           else 1
        end rank
    , @prevParent := parent
    , @prevCent := perCent
    from 
    (
        select child.id, child.perCent, child.parent
        from likesd parent
        inner join likesd child
           on child.parent = parent.id and child.country = parent.country
        where parent.type = 3
        order by parent.id, child.perCent desc
    ) b
    cross join (SELECT @curRank := 0, @prevParent := null, @prevCent := null) c
) d ) ON a.country = d.country and a.id = d.id
    SET a.rank = d.rank
    WHERE a.type = 10;

---

您缺少一个别名：

UPDATE  likesd a
    INNER JOIN (
select id, perCent, rank
from
(
    select id, perCent, elmTotals 
    , @curRank :=   
        case 
           when @prevParent = parent then
               case 
                   when @prevCent = perCent then @curRank
                   else @curRank + 1
               end
           else 1
        end rank
    , @prevParent := parent
    , @prevCent := perCent
    from 
    (
        select child.id, child.perCent, child.parent
        from likesd parent
        inner join likesd child
           on child.parent = parent.id and child.country = parent.country
        where parent.type = 3
        order by parent.id, child.perCent desc
    ) b
    cross join (SELECT @curRank := 0, @prevParent := null, @prevCent := null) c
) d )f ON a.country = d.country and a.id = d.id
    SET a.rank = d.rank
    WHERE a.type = 10;

---

您缺少一个别名：

UPDATE  likesd a
    INNER JOIN (
select id, perCent, rank
from
(
    select id, perCent, elmTotals 
    , @curRank :=   
        case 
           when @prevParent = parent then
               case 
                   when @prevCent = perCent then @curRank
                   else @curRank + 1
               end
           else 1
        end rank
    , @prevParent := parent
    , @prevCent := perCent
    from 
    (
        select child.id, child.perCent, child.parent
        from likesd parent
        inner join likesd child
           on child.parent = parent.id and child.country = parent.country
        where parent.type = 3
        order by parent.id, child.perCent desc
    ) b
    cross join (SELECT @curRank := 0, @prevParent := null, @prevCent := null) c
) d )f ON a.country = d.country and a.id = d.id
    SET a.rank = d.rank
    WHERE a.type = 10;

---

我在评论中发布了

）f

作为

）missingTableAlias

。首先得到：）在on子句中，现在应该是a。和f。或者a。和d。？我在on子句中不断得到未知列“d.country”我认为应该是a.country=f.country和a.id=f.id只是一件小事，我是否应该在

WHERE

子句中也指定连接条件以使事情更安全？我不认为将条件也放在WHERE上会使事情更安全。我在注释中发布了

）f

作为

）missingTableAlias

。首先得到：）在on子句中，现在应该是a。和f。或者a。和d。？我在on子句中不断得到未知列“d.country”我认为应该是a.country=f.country和a.id=f.id只是一件小事，我是否应该在

WHERE

子句中也指定连接条件以使事情更安全？我不认为将这些条件也设置在WHERE上会使事情更安全。sqlfiddle是否为其他人关闭？@Mihai是的，它关闭了。sqlfiddle是否为其他人关闭了？@Mihai是的，它关闭了。

cross join (SELECT @curRank := 0, @prevParent := null, @prevCent := null) c
) d ) ON a.country = d.country and a.id = d.id
     ^ Here