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Finding duplicate values in a SQL table

It’s easy to find duplicates with one field: SELECT email, COUNT(email) FROM users GROUP BY email HAVING COUNT(email) > 1 So if we ...

April 10, 2022
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How does database indexing work? [closed]

Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so ...

April 10, 2022
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Add a column with a default value to an existing table in SQL Server

How can I add a column with a default value to an existing table in SQL Server 2000 / SQL Server 2005? 4 ...

April 10, 2022
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How do I UPDATE from a SELECT in SQL Server?

In SQL Server, it is possible to insert rows into a table with an INSERT.. SELECT statement: INSERT INTO Table (col1, col2, col3) ...

April 9, 2022
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What is the difference between “INNER JOIN” and “OUTER JOIN”?

Also how do LEFT JOIN, RIGHT JOIN and FULL JOIN fit in? 2 27 Assuming you’re joining on columns with no duplicates, which ...

April 9, 2022
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