Question

我有一个用户填写的表格，当患者转移到另一个地方时。

表单的相关部分如下所示： enter image description here

我想计算没有Date of Return的患者数量。

相关表格 -

form_names - 表单列表

select id, name from form_names where id = 47

id    name
----- ----------------------
47    Transfer of Health Information

form_items - 列出每个表单（form_name）的问题。

select id, form_name, text from form_items where form_name = 47

id          form_name   text
----------- ----------- ------------------------------------
1147        47          Date of Transfer:
1148        47          Sending Facility:
1155        47          Date of Return:

form_records - 表明特定患者（pid）填写表单（form_name）的记录。

select id, pid, date, form_name From form_records where pid = 260 and form_name = 47

id          pid         date                    form_name
----------- ----------- ----------------------- -----------
16409       260         2013-04-24 09:33:29.000 47

现在，最后一个相关表是form_answers表。 此表格中仅填写完整的答案。

正如您所看到的，由于Date of Return值从未在表单中填写过，因此它永远不会出现在此表中：

select id, form_record, form_item, text from form_answers where form_record = 16409

id                   form_record form_item   text
-------------------- ----------- ----------- -----------------------------------------
354535               16409       1147        04-24-2013
354536               16409       1148        Lawrence Jail
354537               16409       1149        Lawrence County Hospital
354538               16409       1151        NKMA

我尝试过类似的东西，但它不起作用：

select
        count(*)
from
        form_names fn
                inner join form_items fi on fn.id = fi.form_name
                inner join form_records fr on fn.id = fr.form_name             
                left outer join form_answers fa on fr.id = fa.form_record and fi.id = fa.form_item
where
        fn.name like '%Transfer of Health Information%'
        and dateadd(dd, 0, datediff(dd, 0, fr.date)) = dateadd(dd, 0, datediff(dd, 0, getdate()))
        and fi.text like '%receiving facility%'
        and fa.id is NULL

如何找到没有返回日期的患者数量

Answer 1

我认为答案的加入是不正确的。您需要同时加入项目和fr.id：

select count(*)  -- should this be "count(distinct pid)"?
from form_names fn inner join
     form_items fi
     on fn.id = fi.form_name inner join
     form_records fr
     on fn.id = fr.form_name left outer join          
     form_answers fa
     on fn.id = fa.form_item and fa.form_record = fr.id
where fn.name like '%Transfer of Health Information%'
      fn.text like '%Date of Return%' and
      dateadd(dd, 0, datediff(dd, 0, fr.date)) = dateadd(dd, 0, datediff(dd, 0, getdate())) and
      fi.text like '%receiving facility%' and
      fa.id is NULL;

您查询失败，因为某些其他表单符合条件。

顺便说一句，我发现让外键与主键的名称相匹配要容易得多。除此之外，外键应该是表格的名称，后跟_id或Id。

查询空白答案 - 表中缺少一行

1 个答案: