左外连接到生成的表？

我完全错了吗？我想做一个左外连接到2个表生成的查询，但我不断收到错误。我需要不同的方法吗？左外连接到生成的表？

T1：

ID, Surname,Firstname

T2：

ID,JobNo,Confirmed

我有以下查询：

SELECT JobNo AS N, StaffID AS P, Confirmed as C, 
     FirstName AS F,Surname AS S 
FROM gigs_players, Players 
WHERE t1.StaffID=t2.StaffID AND JobNo="2" 
     AND (`Confirmed` IS NULL OR Confirmed ='Y') 
ORDER BY Instrument,Surname

我想补充：

LEFT OUTER JOIN contacted (ON t1.StaffID=contact.ID AND t2.JobNo=contact.JobNo)"

我可以对从2个表生成的查询执行left outer join吗？

来源

2012-01-05 user358360

我不明白你的问题。你能更准确吗？ – DonCallisto 2012-01-05 00:29:21

当您执行“t1.StaffID = t2.StaffID”时，暗示t1和t2是查询中的表格，但它们不是。查询中指定的唯一表格是“gigs_players”和“Players”。 – Aaron 2012-01-05 00:34:45

也许你需要做一个子查询的左连接？ [链接]（http://forums.mysql.com/read.php?24,145214） – 2012-01-05 00:43:15

为了在要添加的左外连接中使用t1和t2，您需要将它们与第一个表连接起来，因此无法在左外连接中直接引用它们，如下所示：

SELECT JobNo AS N, StaffID AS P, Confirmed as C, 
    FirstName AS F,Surname AS S 
FROM gigs_players, Players 
Inner join t1 on ... 
Inner join t2 on ... 
LEFT OUTER JOIN contacted c 
    on t1.StaffID=c.ID AND t2.JobNo = c.JobNo 
WHERE t1.StaffID=t2.StaffID AND JobNo="2" 
    AND (`Confirmed` IS NULL OR Confirmed ='Y') 
ORDER BY Instrument,Surname

所以，根据你的表有结构，定义这两个条件与t1和t2与其他表联接。

来源

2012-01-05 00:46:56

以下是子查询左连接的示例。这可能是你正在寻找的。

select 
parts.id, 
min(inv2.id) as nextFIFOitemid 
from test.parts 
left join 
(select 
    inventory.id, 
    coalesce(parts.id, 1) as partid 
    from test.inventory 
    left join test.parts 
    on (parts.id = inventory.partid) 
) inv2 
on (parts.id = inv2.partid) 
group by parts.id;

来源

2012-01-05 00:50:41

左外连接到生成的表？

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