This code is part of a SQL query, specifically within...

This code is part of a SQL query, specifically within the WHERE clause, and it applies conditions to filter rows based on complex criteria. Here's what it does, broken into components:

1. Verify that x."diameter" is not null or an empty string:

   x."diameter" is not null and x."diameter" != ''
   

   • Ensures that the column x."diameter" is not NULL and is not an empty string (''). Rows where x."diameter" is missing or blank are excluded.

2. Match x."componentId" with y."componentId":

   x."componentId" = y."componentId"
   

   • Ensures that the value in x."componentId" matches the value in y."componentId". This likely relates to some relationship or join condition between x and y.

3. Exclude rows where certain conditions exist in another table:

   not exists (select 1 from tmp_improvements_floors_assemblies_${JOB_ID} z 
              where z."quantityCalcMethod" in ('37','38','39') and z."floorId" = x."floorId")
   

   • Uses a NOT EXISTS clause to exclude rows from the result set if there exists associated data in the tmp_improvements_floors_assemblies_${JOB_ID} table (z) where:
     • z."quantityCalcMethod" is one of '37', '38', or '39', and
     • z."floorId" matches the x."floorId".
   • The ${JOB_ID} implies that the table name changes dynamically, possibly during runtime, based on a variable substitution.

4. Exclude rows where y."improvementCode" matches specific values:

   y."improvementCode" not in ('220','224','225','230','232','236','286','288','900','901','902','903','904','905','906')
   

   • Ensures that the value in y."improvementCode" is not one of the specified codes. Rows where y."improvementCode" is any of these listed codes are filtered out.

Conclusion:

This WHERE clause applies multiple filtering criteria on the data:

• Ensures the diameter column is valid (not NULL or empty).
• Joins or matches data between entities x and y on their componentId.
• Excludes rows if certain conditions exist in a third table (tmp_improvements_floors_assemblies_${JOB_ID}).
• Excludes rows where a specific improvementCode matches a set of forbidden values.

It seems to be part of a query designed for selective filtering in a data processing pipeline, possibly related to improvements or components associated with floors or assemblies in some structured dataset.