MySQL Inner Join 2表

Question

SELECT *
FROM tableA a
INNER JOIN tableB b
ON  a.someColumn = b.otherColumn
INNER JOIN tableC c
ON b.anotherColumn = c.nextColumn

What if tableA and tableB has the same name in fields? How can I use:

<?
$name = mysql_fetch...
echo $name['a.title'] . ' ' . $name['b.title'];
?>

So I could get title from tableA and title from tableB. Because now, if use just $name['title'] it returns tableA's title. And the above code unfortunately gives just an empty string.

Answer 1

Instead of doing select * , you can put an alias on the columns as well.

SELECT a.title AS 'a_title', b.title AS 'b_title'
-- ...

Then your PHP would be something like:

$name['a_title']

Answer 2

Use an alias

SELECT  a.title AS TitleA,
        b.title AS TitleB,
        ...

FROM ...

Then reference the alias:

$name['TitleA']

Answer 3

Stop using SELECT * !

Explicitly list your columns, which will then allow you to alias them as needed.

SELECT a.title AS TableATitle, b.title AS TableBTitle, ...

Answer 4

Instead of using SELECT *, you will have to call out the fields by name. When you do this, you can assign an alias to be used for each.

SELECT a.title AS aTitle, b.title AS bTitle, etc...

Answer 5

SELECT *, a.title as atitle, b.title as btitle
FROM tableA a
INNER JOIN tableB b
ON  a.someColumn = b.otherColumn
INNER JOIN tableC c
ON b.anotherColumn = c.nextColumn