Ling to sql 多表查询，多个条件进行关联
<p> 利用多表查询进行关联时，提示 join子句中其中一个表达式的类型不精确，注意字段类型和名称要同等，否则join时提示语法错误，错误截图如下</p>var incomeDetails = from a in _postgreDbContext.merchant_daily_income_detail
join b in _postgreDbContext.merchant_daily_invoice on new { a.merchant_id, a.date.Date } equals new { b.merchant_id, b.date.Date }
select a;
<p><div align="center"></div></p><br><br/><br/><br/><br/><br/>来源：<a href="https://www.cnblogs.com/personblog/archive/2019/09/16/11526508.html" target="_blank">https://www.cnblogs.com/personblog/archive/2019/09/16/11526508.html</a>
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