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How can a LEFT OUTER JOIN return more records than exist in the left table?
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SELECT Table1.Id, Table2.Id FROM Table1 LEFT OUTER JOIN Table2 ON Table1.Id=Table2.Id
Results:
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2,2
2,2
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This is what you call explained by a pro
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How to select all records from one table that do not exist in another table?
... portion of our result empty for that row. Then we constrain our selection by picking only those rows in the result where the matching row does not exist. Finally, We ignore all fields from our result except for the name column (the one we are sure that exists, from table1).
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