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Respective customerid columns - PowerPoint PPT Presentation

SQL JOINS

SQL JOINS. WHY USE A JOIN?. The SQL JOIN clause is used whenever we have to select data from 2 or more tables. HOW TO USE A JOIN. To be able to use the SQL JOIN clause to extract data from 2 (or more) tables, we need a relationship between certain columns in these tables. .

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Respective customerid columns - PowerPoint PPT Presentation

SQL JOINS