MySQL的查询需要帮助

Question

我有两个表：

t1 
------------------ 
inv_ID 
inv_memID 
inv_projID 

t2 
------------------ 
is_ID 
is_msgID 
is_contID 

我需要得到所有t2.is_contID到一个数组，其中

• inv_projID = 5
• t2.is_msgID = T1 .inv_ID和
• t1.inv_memID = 1

似乎很简单的，但我坚持......尝试这样：

SELECT t2.is_contID 
INNER JOIN t1 ON (t1.inv_ID = t2.is_msgID) 
FROM t2 
WHERE t1.inv_projID = 5 
AND t1.inv_memID = 1 

我缺少什么？

Answer 1

FROM在JOIN之前。

SELECT t2.is_contID 
FROM t2 
INNER JOIN t1 ON (t1.inv_ID = t2.is_msgID) 
WHERE t1.inv_projID = 5 
AND t1.inv_memID = 1 

SQL对关键字的顺序非常挑剔。
正确的顺序是：

SELECT 
FROM 
JOIN 
WHERE 
HAVING 
GROUP BY 
ORDER 
LIMIT <<-- MySQL only, other DB's user other keywords in other places.