仅根据周末/工作日/两者的标志获取行

Question

I have a whole bunch of tariffs, some work on weekends, some work on weekdays some on both. Sometimes I'll be querying on NOW() but sometimes I'll be querying on datetime column.

id   | Weekday | Weekend | Price
 1   | 1       | 0       | 0.04   
 2   | 0       | 1       | 0.02          

date
2020-04-15 00:00:00
2012-04-16 00:00:00

The date is from another table and is not related to the Price / days of week.

I know I can get the weekend date s by

SELECT * FROM tariff where EXTRACT(ISODOW FROM date) IN (6,7)

however I can't think of how I'd get rows that are either weekend / weekdays or both given a date.

** edit **

Updated the tables to show the dates are seperate. What I'm trying to get is the tariff that corresponds to the date in that table, whether it's on a week day or a weekend (or both but I can extrapolate that).

The weekend 1 is the tariff that is used for weekends, weekdays 1 , all days is both.

Answer 1

Cannot give you a query, supply anything to query. Nor can we be sure that the columns Weekday and Weekend mean as you didn't tell us. But if we take them as boolean indicator where 1 means desired may some thing like will work for you.

    select ...
      from ...
     where ...
       and (   (weekday = 1 and weekend =1) 
            or (weekday = 1 and extract(isodow from date) not in (6,7))
            or (weekend = 1 and extract(isodow from date)    in (6,7)) 
           ) ;