MySQL: Query and join two tables

Question

I have two tables that I believe I want to JOIN. I\'m very new to this and am not completely sure…

The first table is called venues with the variables <

Answer 1

How about this?

SELECT t1.*, t2.*
FROM venue t1 JOIN venue_terms t2
ON t1.id = t2.venue
WHERE (t2.option = 1 AND t2.value = 10)

NOTE: I believe option and value are of type INT.

If they are of type varchar then change above query to

SELECT t1.*, t2.*
FROM venue t1 JOIN venue_terms t2
ON t1.id = t2.venue
WHERE (t2.option = '1' AND t2.value = '10')

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Update 1

As per your new requirement, you will just need to add that condition with OR option as shown below.

SELECT t1.*, t2.*
FROM venue t1 JOIN venue_terms t2
ON t1.id = t2.venue
WHERE 
     (t2.option = 1 AND t2.value = 10)
     OR
     (t2.option = 3 AND t2.value = 14)

Answer 2

This will join the two tables and print out the venues which matches the attributes (option, value) in venue_terms:

SELECT v.* FROM venue v, venue_terms vt
WHERE v.id = vt.venue
AND vt.option = 1 
AND vt.value = 10

Answer 3

You want to find venues that match conditions in two rows in table venue_terms. This can be accomplished by various methods. The most usual is by joining that table twice (another would be by a grouping query).

Here's the first way. Join twice to the venue_terms table:

SELECT v.id                                  --- whatever columns you need 
     , v.slug                                --- from the venues table
     , v.name
FROM venues AS v
  INNER JOIN venue_terms AS vt1
    ON  vt1.venue = v.id
  INNER JOIN venue_terms AS vt2
    ON  vt2.venue = v.id
WHERE ( vt1.option = 1 AND vt1.value = 10 )
  AND ( vt2.option = 2 AND vt2.value = 4 ) ;

If you have 3 conditions, join thrice. If you have 10 conditions, join 10 times. It would be good for the efficiency of the query to have a compound index on (option, value, venue) in the terms table.

Answer 4

try this

SELECT venue.*, venue_terms.*
FROM venue 
INNER JOIN venue_terms ON venue.id = venue_terms.venue 
WHERE venue_terms.option IN ( 1 ,2)
AND venue_terms.value IN (10,4)
GROUP BY venue.id