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mysql - SQL query to calculate sum value in SQL using 2 tables without using a join - Stack Overflow
KB483322: Two identical tables for a full outer join twice when metric join type is set to Outer Join and SQL Global Optimization is set to level 4
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Microsoft Cloud Solutions - Tools & Tutorials: Be careful with join clauses when writing complex queries
KB483322: Two identical tables for a full outer join twice when metric join type is set to Outer Join and SQL Global Optimization is set to level 4
![How to Join two tables and sum their columns across in Mysql based on distinct column - Stack Overflow How to Join two tables and sum their columns across in Mysql based on distinct column - Stack Overflow](https://i.stack.imgur.com/mH2QG.jpg)