子查询内的MySQL连接

我有这个：

# tab1 = Company
# tab2 = Forms
# tab3 = Filled forms from each company enabled to it.

# Search Companies with pending/empty Forms.
# Company #1 has 3 forms, all filled, not will be listed;
# Company #2 has form 2 and 3, only form 2 is filled, so it will be listed;
# Company #3 has not form filled, so it will be listed;

SELECT company.*
FROM tab1 as company

WHERE (
  SELECT TRUE
  FROM tab2 AS forms

  # Join compatible company forms results/fills.
  # Itll join with company.id (that here not exists) and the forms.id (that exists)
  LEFT JOIN tab3 AS fills ON
    fills.id_tab1 = company.id AND
    fills.id_tab2 = forms.id

  # Itll filter forms that company have.
  # And will accept ONLY if none result is found, what mean "pending fill" on company.
  # I need just that.
  WHERE 
    FIND_IN_SET(forms.id, company.id_forms) AND
    fills.id IS NULL
)

我得到未知列

tab1.id

如何解决

我需要访问子查询内部的

tab1

列

更新#1-

---

实时示例：

试试这段代码，逻辑是一样的

 SELECT tab1.* from tab1
        inner join tab3 ON  tab3.id_tab1 = tab1.id
    WHERE .....

---

你到底想做什么？考虑提供适当的DDL（和/或SqLFIDLE）和期望的结果集，而不是只说“试试这个”，解释它是如何解决这个问题的（如果它确实是这样，我认为它没有）。我只是尽我所能去解决这个问题，如果它不起作用的话，David Rodrigues会尝试其他的东西。如果您看到他的原始代码tab.2与逻辑完全不相关，那么如果tab1.id=tab3.id，那么在tab2上选择true就是多余的。