两表间查询

Question

这是我的带有 2 个参数的查询。有人可以帮我吗？

sql = "select * 
       from studentlist 
       where firstname like '%" 
     & Transaction.SEARCHSTUDENT.Text 
     & "%' or studentnum like '%" 
     & Transaction.SEARCHSTUDENT.Text 
     & "%' and not in (select studentnum from borrowing of books where status ='borrowed')"

Answer 1

如果 borrowing of books 是您的 table 名称（带空格），它应该用反引号括起来，如下所示：

`borrowing of books`

编辑：此外，您的 where 子句中似乎缺少 studentnum，因此它实际上应该是这样的：

sql = "select * 
   from studentlist 
   where (firstname like '%" 
 & Transaction.SEARCHSTUDENT.Text 
 & "%' or studentnum like '%" 
 & Transaction.SEARCHSTUDENT.Text 
 & "%') and studentnum not in (select studentnum from `borrowing of books` where status ='borrowed')"

两表间查询

Query between two tables

.net

mysql

database

executereader