T-SQL中的Update语句有问题

I have two tables:

我有两个表:

CREATE TABLE [dbo].[Task](
    [SysTask] [int] IDENTITY(1,1) NOT NULL,
    [TaskStatus] [int] NOT NULL,
)

CREATE TABLE [dbo].[Queue](
    [SysQueue] [int] IDENTITY(1,1) NOT NULL,
    [SysTask] [int] NOT NULL,
    [QueueStatus] [int] NOT NULL,
)

One TASK has many Queue records. I know these names are confusing a little bit. I need to update all the records from the table TASK, which have no record in the table QUEUE with QueueStatus < 4. And this query drives me crazy!

一个任务有许多队列记录。我知道这些名字有点混乱。我需要更新表任务中的所有记录，这些记录在QueueStatus < 4的表队列中没有记录。这个问题让我抓狂!

Here is what I've tried:

以下是我尝试过的:

    UPDATE Task SET SysTaskStatus = 3
        WHERE SysTaskStatus <> 3 AND [SysTask] NOT IN ((SELECT tq.SysTask FROM [dbo].[TaskQueue] tq WHERE [SysTask] = tq.SysTask AND tq.[SysTaskQueueStatus] IN (1,2,3)))

    UPDATE Task SET SysTaskStatus = 3
        WHERE EXISTS (SELECT 1 FROM [dbo].[TaskQueue] WHERE Task.[SysTask] = [SysTask] AND [SysTaskQueueStatus] <4 HAVING COUNT(*)=0)

    UPDATE Task SET SysTaskStatus = 3 
        WHERE 0 = (SELECT SysTask FROM [dbo].[TaskQueue] WHERE Task.[SysTask] = SysTask AND [SysTaskQueueStatus] < 4)

For all this queries there is always the same error:

对于所有这些查询，总是有相同的错误:

Subquery returned more than 1 value. This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression. The statement has been terminated.

子查询返回的值大于1。当子查询后跟=、!=、<、<=、>、>=或子查询用作表达式时，不允许这样做。声明已被终止。

3 个解决方案

#1

If I've understood you correctly, this should do the trick:

如果我没理解错的话，这个方法应该能奏效:

UPDATE
  Task
SET 
  SysTaskStatus = 3
WHERE
  NOT EXISTS (SELECT * FROM TaskQueue WHERE QueueStatus < 4 AND Task.SysTask = TaskQueue.SysTask)

#2

Perhaps you need to change WHERE clause like

也许您需要更改WHERE子句like

WHERE {NOT} EXISTS (SELECT ... )

instead of

而不是

WHERE {0} = (SELECT ... )

it would be much better and faster

会越来越好，越来越快

#3

WHERE 0 = (SELECT SysTask FROM [dbo].[TaskQueue] WHERE Task.[SysTask] = SysTask AND [SysTaskQueueStatus] < 4)

this clause is expecting a scalar value, and you are providing a table value.

这个子句期望的是一个标量值，而您提供的是一个表值。

#1