* Rory McKinley
[...]
> SELECT a.line_number, a.category_value, IFNULL(b.parameter_trigger, 0)
> FROM DB1.Table 1 AS a LEFT JOIN DB2.Table 2 AS b ON
> a.category_name = b.parameter_value
> WHERE a.line_type = 13 AND b.parameter_ID = 13
>
> The only problem is that the query only returns the first two
> records and not the third record - contrary to my expectations. I
> am using MySQL 4.0.15-standard together with PHPMyAdmin 2.5.3.
>
> Does anybody know what I am doing wrong?
You have a criteria on the B table in the WHERE clause. Move it to the ON
clause:
SELECT ... AS b ON
a.category_name = b.parameter_value AND
b.parameter_ID = 13
WHERE a.line_type = 13
--
Roger
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