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Tag Archives: normalization

SQL-Basics – Subqueries: Update column with values from another column

SQLBy JörnFebruary 7, 2018

Sometimes You screw up your database design and you have redundancies i.e. your database is not normalized. If You want to correct that: Subqueries for the rescue! In our example we have two tables which contain almost the same information: CREATE TABLE installed_device (`id` int, `device` text, `info` text); INSERT INTO installed_device (`id`, `device`, `info`)…

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