mysql query join/inner join
Solution 1
The following should select what you're describing:
select a.topic
from tableA a
join tableB b on b.id = a.userid
where b.location = 'Australia' -- or whichever location you filter on
which is equivalent to:
select a.topic
from tableA a
join tableB b on b.id = a.userid and b.location = 'Australia'
Solution 2
SELECT a.topic, b.topic FROM tableA a, tableB b WHERE a.id = b.id AND b.location = 'Australia'
Solution 3
Could you please elaborate on what you mean by "tableA userid and in TableB id is same", because they are visible different such that we cannot use them as keys.
As I understand it however, you'd prolly want to do a JOIN and then a SELECT only for the TOPIC.
So, your query should be:
SELECT t1.topic from table1 t1 JOIN tableB t2 on t2.id = t1.id WHERE t2.location = 'Australia'
Solution 4
Try this:
SELECT tableA.topic FROM tableA JOIN tableB
ON tableA.userid = tableB.id
WHERE tableB.location = 'Australia';
Steeve
Updated on July 05, 2022Comments
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Steeve almost 2 years
i have two tables in my mysql i want to extract the results based on combined query for both tables. i tried join as well as inner join but no success the structure of
tableA is
id userid topic 1 34 love 3 64 friendship 35 574 romance 32 253 games 95 633 football 54 26 cricket 648 63 music
tableB is
id location username 34 Australia krkrff 64 india dieiei 574 pakistan frkfrf 253 japan frfffrk 633 india ifirf 26 Australia riiri 63 Australia frffjrr
Please note that in tableA userid and in TableB id is same .both reflect the data of same users.i want to display tableA data by filtering location column from tableB. suppose that i want to display topic of tableB and the users belongs to Australia then it should give output :love cricket music
you can see in tableB that 34,26 & 63 belongs to Australia so the output is like that. if the location is india then outpput will be
friendship and football.please tell how to write sql query.
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Steeve about 12 yearsthe column name is different for userid in tableA and id in tableB but values are same . just check that tableA userid values are appearing in tableB id column so they can be used as key
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er.irfankhan11 almost 8 years@Paul Bellora, How many joins can use in a single mysql query?