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Picking the ON or WHERE Clause for the SQL Predicate

Helping people solve T-SQL problems is one of my favorite hobbies. Someone messaged me the other day with a complex query that was almost complete except for one issue. He needed to perform a LEFT OUTER JOIN but had to filter based on a value from the right table. However, when he added the filter, SQL removed rows from the left table. The task was to decide where to place the SQL predicate: in the ON or WHERE clause.

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Question of the Day

Lots of FKs

In SQL Server 2025, what are the most outgoing and incoming FK references a table can have?

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