OrientDB 踩坑记录

• 子查询得到的结果默认是 Collection, 判断相等的时候需要先调用 FIRST(subQuery) 方法(或其它方法),否则会出现等式判断错误.
  
  • 正确: SELECT FROM Person WHERE name = FIRST((SELECT name FROM Person))
  • 错误: SELECT FROM Person WHERE name = (SELECT name FROM Person)