scenese:在写SQL语句时,组装WHERE条件时,曾出现过因AND,OR优先级问题导致的语句运行结果错误的BUG,故写下此BUG,引以为戒。
转载于:MySQL运算符的优先级 http://www.cnblogs.com/helingfeng/p/6486854.html
优先级 运算符 (最高) ! -(负号),~(按位取反) ^(按位异或) *,/(DIV),%(MOD) +,- >>,<< & | =(比较运算),<=>,<,<=,>,>=,!=,<>,IN,IS NULL,LIKE,REGEXP BETWEEN AND,CASE,WHEN,THEN,ELSE NOT &&,AND XOR ||,OR (最低) =(赋值运算),:=