SQL Server 2022 introduced the LEAST() function, which at first glance, may seem to do the same thing as the already existing MIN() function.
However, these are two separate functions with two separate purposes.
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Overview of the VARP() Function in SQL Server
In SQL Server the VARP() function returns the statistical variance for the population for all values in the specified expression.
Understanding the VAR() Function in SQL Server
In SQL Server the VAR() function returns the statistical variance of all values in the specified expression.
A Quick Overview of SQL Server’s STDEVP() Function
In SQL Server the STDEVP() function returns the statistical standard deviation for the population for all values in the specified expression.
Understanding the STDEV() Function in SQL Server
In SQL Server the STDEV() function returns the statistical standard deviation of all values in a specified expression.
So we can use this function to get the standard deviation of all values in a column.
Continue readingAn Introduction to SQL Server’s GROUPING_ID() Function
SQL Server has a GROUPING_ID() function that returns the level of grouping based on its arguments.
We pass one or more column expressions to the function, and it computes the level of grouping. The column expressions must match the ones provided by the GROUP BY clause.
A Quick Overview of UNION DISTINCT in SQL
If you’ve ever used the UNION clause in a SQL query, chances are you used UNION ALL or just UNION by itself. But some RDBMSs also accept a UNION DISTINCT option.
The UNION DISTINCT option is basically the equivalent of UNION by itself. That is, it removes redundant duplicate rows.
Understanding GROUPING SETS() in SQL Server
When using the GROUP BY clause in SQL Server, we can use the GROUPING SETS() option to combine multiple GROUP BY clauses into one GROUP BY clause. When we do this, the results are the equivalent of doing a UNION ALL of the specified groups.
How GROUP BY CUBE() Works in SQL Server
SQL Server provides GROUP BY CUBE() functionality that we can use in our SQL queries, which creates groups for all possible combinations of columns.
It’s similar to the GROUP BY ROLLUP() functionality, except that it can provide us with more information, due to the fact that it groups all possible combinations.
Understanding GROUP BY ROLLUP() in SQL Server
When we use the GROUP BY clause in SQL Server, we have several options for specifying how the GROUP BY operation is applied. One such option is the ROLLUP modifier. We can use this modifier to create subtotals and grand totals.