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Editorial Team
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Asked: 2026-05-22T23:41:46+00:00

table user ____________________________________________ id name nickname info_id 1 john apple 11 2 paul banana

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table user
____________________________________________
id    name    nickname    info_id
1     john    apple        11
2     paul    banana       12
3     pauline melon        13

table info
_____________________________________________
id    job         location 
11    model       usa
12    engineer    russia
13    seller      brazil

result I want
______________________________________________
1   john    apple    model     usa

my query

left join:

select * from user a left join info b on b.id = a.info_id where a.id=1

subquery:

select a.*, b.* from (user a, info b) where b.id = a.info_id

which is better?

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1 Answer

  1. Editorial Team
    SELECT a.`name`, a.`nickname`, b.`job`, b.`location` 
FROM `user` AS a
LEFT JOIN `info` AS b 
    ON ( a.`info_id` = b.`id` )

    That should be pretty efficient. Try using MySQL EXPLAIN if you are concerned (also make sure there are indexes on the ID fields):
    http://dev.mysql.com/doc/refman/5.1/en/using-explain.html

    UPDATE

    After seeing that you are not having performance problems just yet, I would not worry about it. “Don’t fix what ain’t broken”. If you find that it is slowing down in the future, or it is bottle-necking on that function, then worry about it.

    The query I gave should be pretty efficient.

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