使用ON <column> = <constant>加入＆＃34;不支持JOIN表达式＆＃34;错误

Question

有人可以告诉我我的代码有什么问题吗？

String sqlQuery = @"SELECT la.id, ac.id
 FROM lablesM as la LEFT JOIN
 actions as ac
ON ac.id = 4;";

这是错误：

JOIN expression not supported.

非常感谢！

Answer 1

做这样的事情：

"SELECT la.id, ac.id
 FROM lablesM la 
 LEFT JOIN actions ac
 ON ac.id = la.id 
 AND ac.id = 4;"

Answer 2

我认为您应该将SQL语句重写为

String sqlQuery = @"SELECT la.id, ac.id
 FROM lablesM as la inner JOIN
 actions as ac
ON (ac.id = la.id)
where ac.id = 4;";

我认为la.id是外键字段。