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某些情况下，sqlserver的表会被锁住，比如某个会话窗口有数据一直没提交，窗口又没关闭，这时表就会被锁住
其他任何连接查询表数据时都不会返回
这时需要手工杀掉产生死锁的会话ID，才能恢复正常
查看被锁表：
select request_session_id spid,OBJECT_NAME(resource_associated_entity_id)
tableName
from sys.dm_tran_locks where resource_type='OBJECT'
spid 锁表进程
tableName 被锁表名
解锁：
declare @spid int
Set @spid = 57 --锁表进程
declare @sql varchar(1000)
set @sql='kill '+cast(@spid as varchar)
exec(@sql)
sql server在执行查询语句时会锁表。在锁表期间禁止增删改操作。
如果不想锁表，那就再表名或别名后面加上WITH(NOLOCK)
如下所示：
SELECT Id FROM dbo.T_Table WITH(NOLOCK) WHERE Id = 1
