Tax data warehousing refers to inputting its data, and export refers to outputting some data in the format provided by it. Import and export is a special command of database, which refers to all software-related databases. Different databases have different requirements for import and export. Export is to export some data in the format it provides. Import and export involve a wide range of fields, and software users often use the basic functions of import and export. In order to import and export successfully, the fields must be in one-to-one correspondence.