v 安全等于Null 2002-01-21 18:12:12
v delayed_queue_size 2002-01-21 18:12:12
v ISNULL( ) 2002-01-21 18:12:12
v flush_time 2002-01-21 18:12:12
v <= 2002-01-21 18:12:12
v 保留词 2002-01-21 18:12:12
v - 2002-01-21 18:12:12
v 分组函数 ( ... ) 2002-01-21 18:12:12
v * 2002-01-21 18:12:12
v SQRT(X) 2002-01-21 18:12:12