To calculate the average of a column using SQL, you can use the AVG() function. Here's an example of how you can do it: ```sql SELECT AVG(column_name) AS average_value FROM table_name; ``` Replace ...

Learn how to improve your SQL skills and write better queries that run faster and optimize your database performance. Follow these tips and tricks to use indexes, avoid unnecessary joins, limit ...

Changing the column name is not a trivial operation especially if the column is referenced in Views, Stored Procedures etc. To execute the rename of a column, there is the sp_rename system Stored ...

In this sample statement, the condition (table1.keyfield=table2.keyfield) tells SQL to find records in both tables that contain matching values in the column named by keyfield.