Tags / left-join
How to Use Left Joins to Retrieve Multiple Values from Joined Tables with SQL
Optimizing SQL LEFT JOINs: A Guide to Avoiding Unexpected Results
Using BigQuery SQL to Find Missing Values on Comparing Two Tables over Date Range
Calculating Consecutive Averages in Access: A Self-Join Approach to Handle Missing Data
Fetching Uncommon Data from Oracle SQL: A Guide to Using the MINUS Operator