对于我正在处理的一个chatRoom示例,我很难保持清晰。在本例中,当UserA进入ChatRoom01时,我希望在两者之间创建一个关联。现在,由于ChatRoom01已经存在,我可以通过执行以下操作来获取对象: query.getInBackground(getIntent().getStringExtra("chatRoom"), new GetC
首先,我运行query SELECT id, pid FROM table_relation where pid = 10。SELECT e.pid table_relation AS e e.pid IN (select id from table_relationwhere pid = 10)(SELECT e.pid table_relation AS e
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