Combine two columns into one column in SQL and add it to existing table

JOINing two datasets together, and merging columns together to get rid of nulls.

How to combine two columns into one column SQL server?

Combine Two Columns Into One Column Sql

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Combine Multiple Rows into One Cell Using SQL

Roll up multiple rows into a single row and column in SQL

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Merge Multiple rows into one column without duplicates in Sql Server

Rolling up multiple rows into a single row and column for SQL Server data

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