Question

MySQL - creating a table that has remaining skus when small list in one table is bounced against big list in another table

Asked by: ike1492

Hello.  I have two tables.  Table A is a full list of skus.  Table B is a subest of table A, say Top Sellers.  How do I create a view or table that shows the remainding SKUs when I remove the table B Skus from the table A Skus.  What I am after can be summed up like this  (Master SKU table) - (Top SKU table) = (View of remaining SKUs).  Any and all help greatly appreciated!

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Asked On
2008-11-21 at 13:25:31ID23926600
Tags

SQL

Topics

MySQL Server

,

SQL Query Syntax

Participating Experts
2
Points
500
Comments
6

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Answers

 

by: cxrPosted on 2008-11-21 at 13:40:38ID: 23017379

I think you mean like this:

SELECT * FROM tableA A 
LEFT JOIN tableB B ON 
  A.sku=B.sku 
WHERE B.sku IS NULL

                                              
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Select allOpen in new window

 

by: ike1492Posted on 2008-11-21 at 13:41:36ID: 23017389

I'll give it a try - stand by!

 

by: ike1492Posted on 2008-11-21 at 13:47:51ID: 23017438

I'm using the Navicat MySQL front end, so it is VERY picky.  I tried:
SELECT *
FROM `catalogamazonfull` A
LEFT JOIN 'topsellers' B ON
  `catalogamazonfull`.`c_upc` =  `topsellers`.`item_id

to no avail

 

by: cxrPosted on 2008-11-21 at 13:53:41ID: 23017476

You forgot the WHERE clause...

SELECT *
FROM `catalogamazonfull` A
LEFT JOIN 'topsellers' B ON
  `catalogamazonfull`.`c_upc` =  `topsellers`.`item_id`
WHERE `topsellers`.`item_id` IS NULL

                                              
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Select allOpen in new window

 

by: cxrPosted on 2008-11-21 at 13:56:29ID: 23017502

eh... the table name topsellers must be in backticks, not in apostrophes... actually, in this case you don't need backticks either:

SELECT *
FROM catalogamazonfull A
LEFT JOIN topsellers B ON
  A.c_upc =  B.item_id
WHERE B.item_id IS NULL

                                              
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Select allOpen in new window

 

by: glcumminsPosted on 2008-11-21 at 14:20:22ID: 23017667

This also works, though it may be less efficient that cxr's method. You can test and see.

SELECT * FROM `catalog` WHERE `id` NOT IN (select `id` FROM `topsellers`);

Another alternative is to change your database structure so that you do not have duplicate data. Just add a field called `topseller` to your main product table, and toggle that field value if an item is a top seller. Then your query is simply:

SELECT * from `catalog` where `topseller` = 0;

20120131-EE-VQP-002

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