mercredi 8 septembre 2021

What is the proper syntax to exclude rows that have a specific ID, but lack a row in a related table with a value in a column on that row?

Currently working on getting my head around the ordering of things, not even with laravel at first, but sql. Though the end goal is to use eloquent.

There are 2 conditions for the rows that need to be excluded. If I'm fetching the rows from TableA..

1) TableA with the column status_id (or TableC.id) has to have lets say a value of 1.

2) TableB has to have an instance for that TableA.id where status_id (or TableC.id) is lets say 2.

Been looking at whereNotIn, whereExists and when for a while now, but can't wrap my head around what is correct for the situation and how it should look like.

Still learning about sql queries and I am very grateful for any tips on this dilemma.



via Chebli Mohamed

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