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SQL JOINの概略

Posted at

eah_sql_blog1.jpg

いつも忘れるのでメモ

よく使うのが、AとBを比較して、どちらかにしか存在しないレコードを抽出は
LEFT JOIN or RIGHT JOIN

抽出条件に、比較先のレコードをNULLにすると、一致しないレコードを抽出できる

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