MYSQL - 顯示所有行，包括空值

Question

有兩個表我正在使用。

ft_form_1
ID | facility_id |承認|放電|人口普查|正在等待| reporting_date | last_modified_date

ft_field_options
ID | option_value | option_name | option_order | list_id

通過以下查詢，我可以從list獲得list_id等於1的所有設施的所有'提交'列表。如果發送重複提交，則只顯示最近的提交。

問題：此查詢只顯示今天提交的設施列表及其隨後發送的數據。我該如何顯示今天還沒有提交的設施清單，並顯示空白或空值？

SELECT t1.facility_id, t2.option_name, t2.option_order, t1.admits, 
t1.reporting_date, t1.last_modified_date, t1.discharges, t1.census, 
t1.pending, DATE_FORMAT(t1.reporting_date,'%m/%d/%Y') AS nicedate 
FROM ft_form_1 t1 
LEFT JOIN ft_field_options t2 
ON (t1.facility_id = t2.option_value AND t2.list_id = 1) 
WHERE (DATE_FORMAT(t1.reporting_date,'%m/%d/%Y') = 
DATE_FORMAT(NOW(),'%m/%d/%Y')) AND (t1.last_modified_date=(
SELECT MAX(last_modified_date) 
FROM ft_form_1 
WHERE facility_id = t1.facility_id)) 
ORDER BY option_order ASC 

Answer 1

你qusation就是這麼簡單隻需按照您的選擇，您CAND通過測試找到答案，並在很多次都沒有任何更多的knowalage關於MySQL

SELECT t1.facility_id, t2.option_name, t2.option_order, t1.admits, 
t1.reporting_date, t1.last_modified_date, t1.discharges, t1.census, 
t1.pending, DATE_FORMAT(t1.reporting_date,'%m/%d/%Y') AS nicedate 
FROM ft_form_1 t1 
LEFT JOIN ft_field_options t2 
ON (t1.facility_id = t2.option_value AND t2.list_id = 1) 
WHERE (DATE_FORMAT(t1.reporting_date,'%m/%d/%Y') != 
DATE_FORMAT(NOW(),'%m/%d/%Y')) AND (t1.last_modified_date=(
SELECT MAX(last_modified_date) AND (t2.optaion_name IS NULL or t2.opation_name = "") 
FROM ft_form_1 
WHERE facility_id = t1.facility_id)) 
ORDER BY option_order ASC 

我一些東西添加到您的代碼運行，就在這裏，你正在運行它，並通過你自己添加你所需要的東西。