php - 如何在mysql中对所有结果求和

Question

这是我获取所有权重的查询。:

$sumQuery = $conn->query("SELECT weightage FROM  r_job_skill WHERE id_job = ".$jobID." AND gdskill = 1");

我得到这样的结果:

weightage
10
20
50

我想计算所有这些结果的总和，我该怎么做......？

Answer 1

或简称:

SELECT SUM(weightage) 
FROM r_job_skill 
WHERE id_job = ".$jobID." 
AND gdskill = 1;