topic Re: I would like to know why CROSS JOIN fails recognize columns in Data Engineering

I would like to know why CROSS JOIN fails recognize columns

Carlton — Fri, 14 Oct 2022 13:45:12 GMT

Whenever I apply a CROSS JOIN to my Databricks SQL query I get a message letting me know that a column does not exists, but I'm not sure if the issue is with the CROSS JOIN.

For example, the code should identify characters such as http, https, ://, / and remove those characters and add the results to a column called websiteurl without the characters aforemention. i.e.

The code is a follows:

SELECT  tt.homepage_url
        ,websiteurl = LEFT(v1.RightString,COALESCE(NULLIF(CHARINDEX('/',v1.RightString)-1,-1),150))
   FROM basecrmcbreport.organizations tt
  CROSS join (VALUES(SUBSTRING(homepage_url,CHARINDEX('//',homepage_url)+2,150)))v1(RightString)

However, the above returns the following:

Error in SQL statement: AnalysisException: Column 'homepage_url' does not exist. Did you mean one of the following? []; line 4 pos 31;
'Project ['tt.homepage_url, unresolvedalias(('websiteurl = 'LEFT('v1.RightString, 'COALESCE('NULLIF(('CHARINDEX(/, 'v1.RightString) - 1), -1), 150))), None)]
+- 'Join Cross
   :- SubqueryAlias tt
   :  +- SubqueryAlias spark_catalog.basecrmcbreport.organizations
   :     +- Relation basecrmcbreport.organizations[uuid#2439,name#2440,type#2441,permalink#2442,cb_url#2443,rank#2444,created_at#2445,updated_at#2446,legal_name#2447,roles#2448,domain#2449,homepage_url#2450,country_code#2451,state_code#2452,region#2453,city#2454,address#2455,postal_code#2456,status#2457,short_description#2458,category_list#2459,category_groups_list#2460,num_funding_rounds#2461,total_funding_usd#2462,... 22 more fields] parquet
   +- 'SubqueryAlias v1
      +- 'UnresolvedSubqueryColumnAliases [RightString]
         +- 'UnresolvedInlineTable [col1], [['SUBSTRING('homepage_url, ('CHARINDEX(//, 'homepage_url) + 2), 150)]]

Any thoughts on how to fix this?

Re: I would like to know why CROSS JOIN fails recognize columns

Anonymous — Fri, 14 Oct 2022 17:25:12 GMT

The underscore in the column name might be problematic, so try to put the column name in back ticks like `homepage_url`.

Would it be easier to use a regexp_extract https://docs.databricks.com/sql/language-manual/functions/regexp_extract.html instead of a cross join?

Re: I would like to know why CROSS JOIN fails recognize columns

Carlton — Fri, 14 Oct 2022 18:51:35 GMT

Hi Joesphk,

Thanks for reaching out.

I tried your suggestion with the back ticks, however, I'm still getting the same error

Re: I would like to know why CROSS JOIN fails recognize columns

Hubert-Dudek — Thu, 20 Oct 2022 12:34:07 GMT

I think you can achieve it without CROSS JOIN.

Please check your query step by step so you will find error.

Re: I would like to know why CROSS JOIN fails recognize columns

Anonymous — Sat, 26 Nov 2022 07:07:57 GMT

Hi @CARLTON PATTERSON

Hope all is well!

Just wanted to check in if you were able to resolve your issue and would you be happy to share the solution or mark an answer as best? Else please let us know if you need more help.

We'd love to hear from you.

Thanks!

Re: I would like to know why CROSS JOIN fails recognize columns

Shalabh007 — Sun, 27 Nov 2022 09:35:51 GMT

@CARLTON PATTERSON

Since you have given an alias "tt" to your table "basecrmcbreport.organizations", to access corresponding columns you will have to access them in format tt.<column_name>

in your code in line #4, try accessing the column 'homepage_url' along with table alias.

Example: "tt.homepage_url"