Delphi使用in语句引入子查询，设定查询条件：由in引入子查询的例子，以子表的方式查询学生名称为李丽的信息，测试前请把Database目录中的SQL数据库文件附加好，并设置数据库连接信息，然后点击“查询”按钮即可。-Delphi uses in the statement introducing sub-queries, set the query conditions: sub-query by example in the introduction, by way of sub-table query name is Li Li Student information, please Database SQL database files in the directory before additional test well and set the database connection information, and then click on the "Search" button.