两个SQL语法错误选择join

Question

我尝试与另一个选择进行左连接，但我一直收到语法错误：

  

您的SQL语法有错误;查看与您的MySQL服务器版本相对应的手册，以便使用接近＆＃39; LEFT JOIN的正确语法（选择prediction_id，费用的总和（值）作为valoarea GROUP BY p＆＃39;在第3行

SELECT id, name FROM `predictions` 
where `predictions` .tablet_id in (select id from tablets where user_id = 19)
LEFT JOIN (SELECT prediction_id, sum(value) from expenses as expense_value GROUP BY prediction_id) ex
ON `predictions`.id = `ex`.prediction_id;

有人看到有什么不对吗？谢谢！

Answer 1

在JOIN：

之前看syntax of a SELECT query：WHERE

SELECT id, name FROM `predictions` 
LEFT JOIN (SELECT prediction_id, sum(value) from expenses as expense_value GROUP BY prediction_id) ex
ON `predictions`.id = `ex`.prediction_id;
where `predictions`.tablet_id in (select id from tablets where user_id = 19)