问题描述
这是我正在使用pgAdmin使用的Postgresql数据库。
请原谅我，如果这是一些常识，我是Postgresql的新手……并且我没有通过先前的搜索找到任何直接答案。
我想知道当使用pgadmin及其任何内置功能运行查询时，是否有一种简单的方法可以将start_time / end_time参数实现为输入。
我在这里使用的数据类型是“带时区的时间戳”。
正在寻找实现此目标的最佳方法的方向。
我考虑过将start_time和end_time声明为变量，然后使用WHERE基于这些变量进行过滤，但是没有第三方/应用程序级别的解决方案，当查询在pgadmin内部运行时，是否有提示输入的方法？
我很高兴提出任何建议-这是我尝试使某项工作正常进行的尝试，但它出错了：查询没有结果数据的目的地。
do $$
DECLARE
start_date timestamp := '2020-10-1';
end_date timestamp := '2020-10-5';
begin
select distinct on (account.id,menu.name,kitchen_item.name)
account.id as "Account ID",account.firstname as "Seller First Name",account.lastname as "Seller Last Name",account.email as "Seller Email",account.phone as "Seller Phone",address.address as "Seller Address (Street)",address.address_2 as "Seller Address 2",account.zip_code as "Seller Zip",address.neighborhood as "Seller Neighborhood",menu.name as "Name of active menu",kitchen_item.name as "dishes",kitchen_item.price as "Price",kitchen_item.daily_max_orders as "Quantity",menu.pickup_start_time as "Start time",menu.pickup_end_time as "End time",menu.repeat_mon as "Monday",menu.repeat_tues as "Tuesday",menu.repeat_wed as "Wednesday",menu.repeat_thurs as "Thursday",menu.repeat_fri as "Friday",menu.repeat_sat as "Saturday",menu.repeat_sun as "Sunday",order_item.created as "Date of last sale"
from account
left join store on account.id = store.account_id
left join menu on store.id = menu.store_id
left join menu_item on menu.id = menu_item.menu_id
left join kitchen_item on (menu_item.kitchen_item_id = kitchen_item.id and store.id = kitchen_item.store_id)
left join orders on (orders.store_id = store.id)
left join order_item on (order_item.order_id = orders.id)
join store_address on store.id = store_address.store_id
join address on store_address.address_id = address.id
where orders.placed BETWEEN start_date AND end_date
order by account.id asc,kitchen_item.name asc,order_item.created desc;
end $$;
解决方法
DO创建一个不返回任何数据的匿名函数。
您可以使用WITH：
WITH input (start_date,end_date) AS
(SELECT '2020-10-01'::timestamp AS start_date,'2020-10-05'::timestamp AS end_date)
SELECT ...
FROM...
JOIN input
WHERE orders.placed BETWEEN input.start_date AND input.end_date