Question

I wanted to know if it was possible to make a select on a table that contains multiple field and join them in 1 result :

Example :

Table :

id
dayOne_City
dayTwo_City
dayThree_City

Result : one column that contains the rows of all the cities (Distinct).

2) Am i better to do a view if i have a lot of query to that specific list ?

3) should i do 3 select with union ?

Thank you

Answer 1

You should be fine with:

select dayOne_City from YourTable
UNION
select dayTwo_City from YourTable
UNION
select dayThree_City from YourTable

However, you should review your design to allow multiple cities per whatever-is-that-your-table stores. That is, create an actual many-to-many relationship by creating an intermediate table between YourTable and Cities.