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Joining tables question?

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Apr 02.2017

Hey, I’m retrieving data from a database after clicking a link from a previous page. Is there a way I can join my ‘articles’ with another table? I tried to put a left join after the FROM clause but I get an error.

At the moment I can only display data from the one table ?

[code=php]
if(!empty($_GET[‘id’]))
{
$sql = ”
SELECT *
FROM articles
WHERE art_book = “” .(int)$_GET[‘id’] . “”
ORDER BY id ASC
“;
[/code]

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PHP

2 Comments(s) ↴

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@ginerjmApr 02.2017 — Is there a common piece of data between the two tables? That' show you do it.

<i>
</i>$q = "select a.fld1, a.fld2, a.fld3, b.fld1, b.fld2
from table1 a, table2 b
where a.fld1 = '$keyvalue' and
a.fld2 = b.fld1
order by a.fld2";


That is a simple join where only records that match a record in the other table will appear. If you need to get the complete set of records from a even if they don't have a match in table b, then you need to do an explicit 'join' query.

Tell us more and we can give you more, although this is a PHP forum not an SOL one. You might want to provide more data to that other forum rather than here.
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@NogDogApr 02.2017 — For a left join, where you want all matches on your articles table and optionally any joins to the other table, it would be something like:
[code=php]
$sql = "
SELECT *
FROM articles
LEFT JOIN other_table ON articles.col_x = other_table.col_y
WHERE articles.art_book = "" .(int)$_GET['id'] . ""
ORDER BY id ASC
";
[/code]
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