Question

querying 3 tables, the last table has an extra row to look for.
tried this:

(SELECT 't1' AS tn, navid, clicks AS cc, tags 
FROM t1 
WHERE DATE_ADD(d, INTERVAL '0 8' DAY_HOUR) <= NOW() 
AND tags LIKE '%cars%' )

UNION DISTINCT

(SELECT 't2' AS tn, navid, clicks AS cc, tags 
FROM t2 
WHERE DATE_ADD(d, INTERVAL '0 8' DAY_HOUR) <= NOW() 
AND tags LIKE '%cars%' )

UNION DISTINCT

(SELECT 't3' AS tn, navid, title, clicks AS cc, tags 
FROM t3 
WHERE DATE_ADD(d, INTERVAL '0 8' DAY_HOUR) <= NOW() 
AND tags LIKE '%cars%' ) 

i’d like to get the title field in t3
any help, thanks

Answer 1

Just add it in the first two subqueries, with a value like NULL:

(SELECT 't1' AS tn, navid, NULL as title, clicks AS cc, tags 
 FROM t1 
 WHERE DATE_ADD(d, INTERVAL '0 8' DAY_HOUR) <= NOW() 
       AND tags LIKE '%cars%' )
UNION DISTINCT
(SELECT 't2' AS tn, navid, NULL as title, clicks AS cc, tags 
 FROM t2 
 WHERE DATE_ADD(d, INTERVAL '0 8' DAY_HOUR) <= NOW() 
       AND tags LIKE '%cars%' )
UNION DISTINCT
(SELECT 't3' AS tn, navid, title, clicks AS cc, tags 
 FROM t3 
 WHERE DATE_ADD(d, INTERVAL '0 8' DAY_HOUR) <= NOW() 
       AND tags LIKE '%cars%' )