从MS Access到VB Net的SQL查询错误

Question

这个查询有什么问题？，我在我的vb net app中运行它，但是我得到了＃34;语法错误（缺少运算符）＆＃34;，我从访问2016应用程序生成的工作sql查询中复制了。

查询：

        Dim sqlquery As String = "Select tblCommissionsP.IDCommissionP, tblCategoryProducts.Nama, tblEmployees.Nama, tblCommissionsP.CommissionType, tblCommissionsP.CommissionRate
                            FROM tblCommissionsP INNER JOIN tblCategoryProducts On tblCommissionsP.IDCategoryProduct = tblCategoryProducts.IDCategoryProduct INNER JOIN tblEmployees On tblCommissionsP.IDEmployee = tblEmployees.IDEmployee"

错误：

System.Data.OleDb.OleDbException: 'Syntax error (missing operator) in query expression 'tblCommissionsP.IDCategoryProduct = tblCategoryProducts.IDCategoryProduct INNER JOIN tblEmployees On tblCommissionsP.IDEmployee = tblEmployees.IDEmploye'.'`enter code here`

Answer 1

尝试将代码修改为：

Dim sqlquery As String = "Select tblCommissionsP.IDCommissionP, tblCategoryProducts.Nama, tblEmployees.Nama, tblCommissionsP.CommissionType, tblCommissionsP.CommissionRate" _
                       & " FROM tblCommissionsP INNER JOIN tblCategoryProducts On tblCommissionsP.IDCategoryProduct = tblCategoryProducts.IDCategoryProduct INNER JOIN tblEmployees On tblCommissionsP.IDEmployee = tblEmployees.IDEmployee"

Answer 2

它现在有效，因为不止一个内连接，所以我必须放括号

 (tblCommissionsP INNER JOIN tblCategoryProducts ON tblCommissionsP.IDCategoryProduct = tblCategoryProducts.IDCategoryProduct) INNER JOIN ...