我想获得NULL值的百分比在蜂巢的表。有没有简单的方法来做到这一点,而不必枚举查询中的所有列名称?在这种情况下,大约有50k行和20列。提前致谢! 喜欢的东西: SELECT count(each_column)/count(*) FROM TABLE_1 WHERE each_column = NULL;
我安装了Netbeans 7.0.1和Qt SDK,并按照here上的说明进行安装。该代码建立很好的,但是当我按运行出现以下错误: The application failed with exit code -1073741515 (0xc0000135).
This could indicate that no required .dll was found in the PATH.
Ple