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From NACE EDUCATION
My SQL



...ems (SQL min and max functions)
* Finding averages (SQL avg function)
* Rows with missing data (null values)
* Finding rows with missing data (SQL is null and is not null tests)
* Sorting result rows (SQL order by clause, sorting in ascending or descending order with asc and desc)
* Using column-name aliases for long-winded column names in select
* Simple joins across multiple
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