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 the in statement to the introduction of sub query, set the query conditions: introduced by in sub query by example, to the child table query student name for Li Li s information, please send SQL database files in the Database directory additional well before the test, and set the database connection information, and then click on the "search" button.