How to join IN SELECT with LIKE from many tables in? - select

Question

I'm trying to create a query that searches out all records that share a similar attribute like so:
select * from table_A
where fullname like in (select firstname from employees where X)
Only thing is that this is just my pseudo code, I actually am sorting through many tables so the real query I have currently looks something like:
select * from devices
where devicename like in (select X from X1 where T in (select T from T1 where Y in (select Y from Y1 where Z in (select Z from Z1 where AreaName = '74';
I'm trying to use the join command but very confused on how to apply it to this situation.

Answer 1

Try:
SELECT d.*
FROM devices d
INNER JOIN X1 ON d.devicename like '%'||x1.X||'%'
INNER JOIN T1 ON x1.T = T1.T
INNER JOIN Y1 ON T1.Y = Y1.Y
INNER JOIN Z1 ON Y1.Z = Z1.Z
WHERE Z1.AreaName = '74'

Answer 2

Here you go ....
SELECT D.*
from Devices D
inner join X1 X on D.devicename like X.X
inner join T1 T on T.T = X.T
inner join Y1 Y on Y.Y = T.Y
inner join Z1 Z on Y.Z = Z1.Z AND Z.Areaname = '74';

Answer 3

Okay, i give you the second query with Join syntax (well, i try to):
select * from Z1 Z1_1
JOIN Y1 Y_1 ON Y_1.Z=Z1_1.Z
JOIN T1 ON T1.Y=Y_1.Y
JOIN X1 X1_2 ON X1_2.T=T1.T
JOIN devices d ON d.devicename=X1_2.X
where Z1_1.AreaName = '74';

Answer 4

Try this:
SELECT d.*
FROM devices d
INNER JOIN X1 ON d.`like` = x1.X
INNER JOIN T1 ON x1.T = T1.T
INNER JOIN Y1 ON T1.Y = Y1.Y
INNER JOIN Z1 ON Y1.Z = Z1.Z
WHERE Z1.AreaName = '74'

Answer 5

The "join" command runs a cross product of the two tables and then selects only the tuples/rows where the common column names have the same values.
So, for your query:
select * from table_A
where fullname like in (select firstname from employees where X)
would be:
select * from table_A
left join employees
on table_A.fullname = employees.firstname
where X