Hi Daniel and Kim, Isn't
> product_name product_category > product_name product_category > product_name product_category > product_name product_category > product_name product_category the way its supposed to be ? You are using the LEFT JOIN syntax, but actually using it just as a JOIN. You could also use something like SELECT * FROM products p, product_cat_join,product_category pc WHERE p.productID=pcj.productID AND pc.catID=pcj.catID; if I remember that correctly. This does exactly the same as the LEFT JOIN above. A LEFT JOIN is normally used to find records which exits in one table, BUT NOT in the other table. So for example: SELECT * FROM products p LEFT JOIN product_cat_join pcj ON p.productID=pcj.productID LEFT JOIN product_category pc ON pc.catID=pcj.catID WHERE pc.catID IS NULL Anybody: Please correct me if I talk rubbish here ;-) Best regards Nils Valentin Tokyo/Japan 2003年 8月 13日 水曜日 13:[EMAIL PROTECTED] さんは書きました: > he is getting the same problem as me as i explained > > i use joins left join and inner join > > SELECT * FROM products p LEFT JOIN product_cat_join pcj ON > p.productID=pcj.productID LEFT JOIN product_category pc ON > pc.catID=pcj.catID; > > products > productID > product > > product_cat_join > joinID > productID > catID > > product_category > catID > product_category > > so say there are 5 records of a product category against a product it would > result in > > product_name product_category > product_name product_category > product_name product_category > product_name product_category > product_name product_category > > instead of > > product_name product_category > product_category > product_category > product_category > product_category > > > Hi Kim, > > > > no offense, but are you actually using the JOIN syntax correctly ? > > > > Could you post your query please ? > > > > My guess is you are doing a JOIN without any set conditions. hat would > > give you the result as described (which is normal). You would use the > > WHERE clause or for a LEFT JOIN ...the ON clause to filter to correct > > data which you are requesting. > > > > Please have a look once more at the JOIN syntax: > > > > http://www.mysql.com/doc/en/JOIN.html > > > > Some examples: > > > > mysql> SELECT * FROM table1,table2 WHERE table1.id=table2.id; > > mysql> SELECT * FROM table1 LEFT JOIN table2 ON table1.id=table2.id; > > mysql> SELECT * FROM table1 LEFT JOIN table2 USING (id); > > > > Best regards > > > > Nils Valentin > > Tokyo/Japan > > > > > > 2003å¹´ 8月 13æ—¥ 水曜日 09:25ã€Kim Kohen > > > > ã•ã‚“ã¯æ›¸ãã¾ã—ãŸ: > >> G'day all, > >> > >> I'm pretty new to MySQL and very new to v4. > >> > >> This is probably going to sound strange, but is it possible to create > >> a union using the logic of a join? I have 4 tables and I need to join > >> data from them, but I'd like to display them like a Union. If I do a > >> straight join, I get lots of multiple entries thus: > >> > >> Page Ad_num status stories > >> 1 4312-T1308 Ad Complete 1-marchingband-A33 Placed 1 > >> 4312-T1308 Ad Complete 1-jobs-T33 Placed 1 > >> 4312-T1308 Ad Complete 1-illegalbuild-A32 Placed 1 > >> 4312-T1308 Ad Complete 1-haldonstfesty-T33 Placed 1 > >> 4312-T1308 Ad Complete 1-jobs-T33 Corrected > >> 1 4312-T1308 Ad Complete 1-car crash-T33 Placed > >> > >> Where ad_num "1 4312-T1308 Ad Complete" is replicated to > >> accommodate all the Joined data from the 'stories' table > >> > >> What I'd like to see is something like this: > >> > >> 1 4312-T1308 Ad Complete > >> 1 1-marchingband-A33 Placed > >> 1 1-jobs-T33 Placed > >> 1 1-jobs-T33 Corrected > >> 1 1-illegalbuild-A32 Placed > >> 1 1-haldonstfesty-T33 Placed > >> 1 1-car crash-T33 Placed > >> > >> Is this sort of thing possible? > >> > >> cheers > >> > >> kim > > > > -- > > --- > > Valentin Nils > > Internet Technology > > > > E-Mail: [EMAIL PROTECTED] > > URL: http://www.knowd.co.jp > > Personal URL: http://www.knowd.co.jp/staff/nils > > > > > > -- > > MySQL General Mailing List > > For list archives: http://lists.mysql.com/mysql > > To unsubscribe: > > http://lists.mysql.com/[EMAIL PROTECTED] -- --- Valentin Nils Internet Technology E-Mail: [EMAIL PROTECTED] URL: http://www.knowd.co.jp Personal URL: http://www.knowd.co.jp/staff/nils -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
