Question

I have very big problem in my SQL query and i don’t know how to decide it.
So, i have query:

SELECT * FROM table1 WHERE leftBorder <= 10 AND rightBorder >= 100

It’s ok.

Next step.

SELECT * FROM table1 WHERE 
(leftBorder <= 10 AND rightBorder >= 100) OR (leftBorder <= 200 AND rightBorder >= 500)

It’s ok.

But, i’d like to take values of left and right border from query, so:

SELECT * FROM table1 WHERE 
???
(SELECT leftBorder, rightBorder FROM table2 WHERE id in (1,2,3,4,5))

I need to make multi-condition for query in query… Is it possible?
I don’t have procedure, just query.

I try to explain you:

SELECT TOP 1 leftBorder, rightBorder FROM table2 WHERE id in (1,2,3,4,5)

this return me 1 row with leftBorder and rightBorder and i can use it in query like:

SELECT * FROM table1 WHERE 
table1.leftBorder <= table2.leftBorder AND table1.rightBorder >= table2.rightBorder 
(SELECT TOP 1 leftBorder, rightBorder FROM table2 WHERE id in (1,2,3,4,5)) as table2

BUT! It works just when i have 1 row return from query. But what should i do, if i have 10 rows in return and i have to generate query for 10 conditions? Could i do it in query?

Answer 1

You can do this using EXISTS condition :

  SELECT * 
  FROM table1 
  WHERE EXISTS
    (SELECT * 
        FROM table2 
        WHERE table2.leftBorder>=table1.leftBorder 
        and table2.rightBorder<=table1.rightBorder)