SQL错误[920] [42000]：ORA-00920：无效的关系运算符

Question

针对以下查询在Oracle中获取无效的关系运算符错误：

SELECT  t1.mxName,  t2.mxName as mxParent, 
  (SELECT  count(*) FROM MATRIX4.mxTNR t3 where v2=t1.mxOid) objCount 
FROM MATRIX4.MXBUSTYPE t1 INNER JOIN MATRIX4.MXBUSTYPE t2 
on t1.mxParent=t2.mxOid 
WHERE t1.mxFlags & 0x2000000 = 0x2000000 OR t1.mxFlags & 0x4000000 = 0x4000000 
order by mxName