Delphi查询指定字段为空的数据有哪些，在程序中你可选择字段，然后点击“查询”按钮就可以了，所有指定字段为空的数据列都被显示出来，是一个基础的Delphi查询技巧，有时候，某个字段的值是空的-Delphi query specifies the data field is empty What, in your program you can choose the fields, then click the "Search" button on it, all of the specified data field is empty columns are displayed, is an inquiry-based Delphi technique, sometimes, the value of a field is empty