SELECT address,job_title,education,SUM(recruiting) FROM commerce_jobs WHERE education = '大專' and ( job_title LIKE '%主管%' OR job_title LIKE '%組長%' OR job_title LIKE '%主任%' OR job_title LIKE '%項目經理%' )
標紅部分的() 括號。and 比 or具有更高的優先級,所以不加括號他就從左到右開始判斷
優先級 運算符 (最高) ! -(負號),~(按位取反) ^(按位異或) *,/(DIV),%(MOD) +,- >>,<< & | =(比較運算),<=>,<,<=,>,>=,!=,<>,IN,IS NULL,LIKE,REGEXP BETWEEN AND,CASE,WHEN,THEN,ELSE NOT &&,AND XOR ||,OR (最低) =(賦值運算),:=
