有人可以告诉我这个sql代码中的错误吗？

Declare @Random int = 1, @Bool bit = 0;

WHILE (@Bool = 0)
    BEGIN
        SET @Random = ROUND(RAND()*(SELECT MAX(CharID) FROM SRO_VT_SHARD_INIT.dbo._Char where LastLogout < DATEADD(DAY, -3, CURRENT_TIMESTAMP),0)
        IF exists (SELECT CharID FROM SRO_VT_SHARD_INIT.dbo._Char WHERE CharID = @Random)
            BEGIN
                SET @Bool = 1 /*true*/
            END
    END
print @Random

它CURRENT_TIMESTAMP说在逗号附近有语法错误后给出错误。如果我删除了，0，则该ROUND函数没有足够的参数。有人吗