Jump to content
  • Announcements

    • boen_robot

      Guidelines and Netiquette   03/28/2017

      Posting Problems:   Having problems posting your topic? Read through this: To join, you agree to our terms and conditions and fill out and submit a registration form. An activation email will be sent to your email adress, so you'll need to verify your account. After that the account has to be validated by one of the moderators. This will mean that it can take up to a day to be activated. A couple of things to remember to ensure approval: Don't use an email address in one of those $2 four character .com domains eg. xyds.com. These will be deleted and the domain added to the banned list. Don't use an email address that is within a domain with a bad reputation for spam. A Google search is run on every email address and email domain. Don't sign up with an email address that doesn't exist, doesn't work or requires the sender to answer a quiz before their email can get to you. Put your country and or state and city in the signup form. Blank forms will go to the botton of the "to do" list. And make sure that your email address and your country match, saying you're from Alabama and using a .ru email address is not going to get you activated. After a membership is activated the first few posts will be monitored. Posting spam or unapproved topics described in the agreement results in an immediate ban. The email provider and the IP addresses associated with the account will be banned and all posts will be deleted. These strict measures have been deemed necessary to hinder spam. Sorry for any inconvenience this causes, but it's not liable to change. If, after reading this, you still can't post and don't understand why, contact one of the Moderators listed here.   Topic Guidelines   Including the following information can expedite an accurate response from board members: Must be a Specific Problem or Question related to web design and development Include Code in Question (wrap with   for small blocks of code and for longer blocks   ) Include Code Author Include Extra Notes/Modifications/Attempts Include web link to page/file when possible Content Guidelines   You may not post, upload, link to, or email any Content that contains, promotes, gives instruction about, or provides prohibited Content. Prohibited Content includes any Content that breaks any local, state, county, national or international law. Prohibited Content also includes: No direct or indirect advertising or websites, forums, products, services No hijacking of posts (do not post your question in someone elses) Content that infringes upon any rights [ex. MP3s and ROMs] (including, but not limited to, copyrights and trademarks) Abusive, threatening, defamatory, racist, or obscene Viruses or any other harmful computer software False Information or libel Spam, chain letters, or Pyramid schemes Gambling or Illicit drugs Terrorism Hacking or cheating for internet/online games Warez, Roms, CD-Keys, Cracks, Passwords, or Serial Numbers Pornography, nudity, or sexual material of any kind Excessive profanity Invasive of privacy or impersonation of any person/entity Hacking materials or information Posting Tips   There are more BBcodes than there are buttons for on the reply menu. To get the full list, click "BB Code Help" underneath the clickable smilie face menu. Use   for small snippets of code Use   for lengthy snippets of code Use   if your snippet is HTML (optional) Use   if your snippet is SQL (optional) Rules of Conduct   Be nice. There's no need for calling someone stupid if they ask an 'easy' question. Keep your avatars and signatures absolutely child friendly. We have a younger audience on this forum. Keep your language appropriate for the same reason above. Do not PM moderators for help on the forum. Post on the topic, or create a new one.   Spam:   Recently, as you have all without doubt noticed, we have had lots of spam and advertisement on the forum. Therefore, we'd like to alert you as to what to do when you have found any of the aforementioned annoying messages: it. Immediately. Give a clear reason, please, if the advertising is not evident. DO NOT POST! Report, let the post stay as is, and we will get to it, meanwhile if you continue to post as normal in the other threads, it won't be on the top so long. Refrain from PMing the member. This won't help at all, as they are most likely spambots anyway. Thank you.       Images in signatures:   After thinking of users on dial-up, we have decided to enforce the following rules regarding signatures. Please pay heed to them. Respecting these rules is respecting the members on this forum with dial-up. Signature rules: No animated images AT ALL. No matter the amount of animation. Maximum image widthxheight: 300x150 Maximum image (file) size: 15kb Use calm colors. Do not use highly contrasting images in your signature, as this can get really annoying when seeing several posts from one member in the same thread. The same prohibited content goes for images as for posts. Lastly, use common sense. No lengthy signatures please. Save us some scrolling. Thank you.       Links in signatures:   Please understand that w3schools.com only exists because of voluntary work and is barely supported by the advertising littered throughout the tutorials and the forum. So, please, stop advertising other sites. DO not post links that drive traffic away from the w3schools domain - especially to a site that offers similar if not identical information. Please help support the site by keeping individuals on it. Thank you. Here are some guidelines as to what you can put in your signature: w3schools links --> allowed w3.org links --> allowed browser links --> allowed html editor links --> allowed personal sites --> allowed tutorial sites competing with w3schools --> NOT allowed sites completely irrelevant to webprogramming and this forum --> NOT allowed   Thanks for understanding, and for taking the time to read this. ~W3Schools Modstaff~
brian47374

SQL Join - Odd results

Recommended Posts

I am trying to do a JOIN on two tables. 

Table 1 has these fields:

-          Handle

-          Variant SKU

-          Variant Barcode

Table 2 has these fields:

-          SKU

-          Barcode

-          Brand

-          Description

SELECT TABLE1.`handle`, TABLE1.`Variant SKU`, TABLE1.`Variant Barcode`, TABLE2.`SKU`, TABLE2.Barcode FROM TABLE1 inner JOIN TABLE2

When I run the statement above, I get the same Variant SKU for every result while the SKU from Table 2 is unique as it should be. Not only that, but the handle (which is the product name) repeats itself for every result and it should not as there are about 550 different products.See 5045.PNG file attached. The VARIANT SKU should be different such as the SKU as should the HANDLE and the VARIANT BARCODE. 

And then I execute this statement below, not only do I get the same repeated handle (product), but the Variat SKU, Variant Barcode, and SKU data is blank. Only the handle and barcode are showing up. Attachment REPEAT.PNG

SELECT TABLE1.`handle`, TABLE1.`Variant SKU`, TABLE1.`Variant Barcode`, TABLE2.`SKU`, TABLE2.Barcode 

FROM TABLE1 

inner JOIN TABLE2 

on TABLE1.`Variant SKU` = TABLE2.`SKU` and TABLE1.`Variant Barcode` <> TABLE2.`Barcode`

Any help on this would be greatly appreciated.

5045.PNG

repeat.PNG

Edited by brian47374

Share this post


Link to post
Share on other sites

When you join a table without any conditions it's just going to produce every possible combination of records.

You didn't show the data that you're joining, just the results, so I can't suggest why it's producing that output, other than to say that it's matching what you're telling it to do.  You're telling it to return records that have the same SKU and different barcodes, so maybe there are records on those table with blank values.  I see at least one blank SKU in the first result.  It also looks like your "variant SKU" and "variant barcode" fields start with a quotation mark and the other ones don't, those are always going to be different.

Share this post


Link to post
Share on other sites

I have provided a couple of screen shots. Hopefully this is what you are looking for as far as data. Also, how do I remove the ‘ from the beginning of the SKU’s and the Barcodes? I imported a CSV file and for some reason it tends to do that when it feels like it, but not all the time. Table 1 is first and then Table 2.

table 1.PNG

table 2.PNG

Edited by brian47374

Share this post


Link to post
Share on other sites

If the data in those fields should never have an apostrophe then you can write an update query to use MySQL's string functions to remove it from existing data, but you really need to make sure that the data you're importing is clean in the first place.  Nothing about computers is random, computers never feel like doing anything.  Sometimes your data is bad, and sometimes it's not.  Like they say, garbage in, garbage out.  The values in your fields are not the same when one of them includes extra characters.  You need to make sure that the process to export the CSV data is using the same rules that the import does.

Share this post


Link to post
Share on other sites

I have no control over the ' being inserted. It is exported from our system in that manner for whatever reason. I have researched this issue and it seems to be a common issue with Excel and CSV files. Not a single one of the proposed solutions works for removing the '. Is there a way to truncate the ' out? 

Share this post


Link to post
Share on other sites

Alright, I got the (‘) removed from all of the files. So, I have the same fields in both tables now. In Table 1 there are 46 columns, and in Table 2 there are 4 columns.

·         Handle (Product name) (Table 1 & Table 2)

·         Vendor (Table 1 & Table 2)

·         Variant SKU (Table 1 & Table 2)

·         Variant Barcode (Table 1 & Table 2)

·          

Table 1 has 867 records (see screenshot)

Table 2 has 552 records  (see screenshot)

However, when I use the following statement, I got I get 17172 results which I have no idea how that is possible.

 

SELECT TABLE1.`handle`, TABLE1.`Variant SKU`, TABLE1.`Variant Barcode`, TABLE2.`Variant SKU`, `TABLE2`.`Variant Barcode` FROM TABLE1 inner JOIN TABLE2 on TABLE1.`Variant SKU` = TABLE2.`Variant SKU` and TABLE1.`Variant Barcode` <> TABLE2.`Variant Barcode`

 

There are no unique fields.

Why am I getting this many results?

Then, when I join and leave out the barcodes, I get closer to what I am looking for in screenshot Join 2 (not allowed to upload). But again, I get FAR more results than I should!

I am wanting to see where the Variant SKU matches and the Barcode doesn’t. Also, where the SKU doesn’t and the barcodes do. They don’t have to be in the same query, but it would be nice if they do.

 

59c406dac3802_table1.thumb.PNG.25624104db38512666e0a7e66b137607.PNG

table 2.PNG

table 1 query.PNG

Edited by brian47374

Share this post


Link to post
Share on other sites

Why am I getting this many results?

Because you're telling it to return every combination of rows where the SKUs match but the barcodes are different.  If your SKUs aren't unique, that could be a lot of rows.  It also looks like you have a lot of rows with blank values, if there are two rows with blank SKUs it's going to return those because they match.  You might want to exclude blank values in the join condition also.

Share this post


Link to post
Share on other sites

Whose fault is what?  Are you going to make several non-sequitor posts and eventually follow that up by adding some spam links in your signature?

Share this post


Link to post
Share on other sites
Quote

Whose fault is what?  Are you going to make several non-sequitor posts and eventually follow that up by adding some spam links in your signature?

What the ???? I have no idea what you are talking about. I am here to solve a problem. Why in the world would you even bring up SPAM links in my signature. Obviously I am not a pro like you, and that is WHY I am here. It has been years since I done anything with SQL. And when I did, about 10 years ago, it was on the IBM AS400 platform. I wish I would have kept my notes. If I would have, I wouldn't be here. ;) 

I appreciate any and all help that I can get. Maybe one day it will all come back to me. Sorry to be a burden by asking questions. 

Share this post


Link to post
Share on other sites

When I included the <> ' ' clause, I got two results. Both of which I know are valid. However, when I added the clause, I got NULL in the last two columns without column names. I find that strange. I would think that I would at least get a column name. Did I do something wrong?

Here is my updated statement: 

SELECT TABLE1.`handle`, TABLE1.`Variant SKU`, TABLE1.`Variant Barcode`, TABLE2.`Variant SKU`, `TABLE2`.`Variant Barcode` 

FROM TABLE1 

inner JOIN TABLE2 on TABLE1.`Variant SKU` = TABLE2.`Variant SKU` 

and TABLE1.`Variant SKU` <> ' ' 

and TABLE2.`Variant SKU` <> ' ' 

and TABLE1.`Variant Barcode` <> TABLE2.`Variant Barcode`

 

null.PNG.036400441aa63800075c74701b2e96c9.PNG

Share this post


Link to post
Share on other sites

That message wasn't directed at you, there was another user that got banned and his posts removed, including the one I replied to

You can probably leave out one of those conditions, since you're requiring that the 2 SKU columns are the same, you only need to check the value of one of them instead of both of them.

That output seems strange though, I've never seen it return a column without a name.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

×