Group by ACCOUNT, then by date, process each group in turn, get the interval from first group from to the current group, and perform deduplication and counting. But SQL grouping must be accompanied by ...

The series of blog posts I wrote last year on semantic model memory usage, in particular this post on the query memory limit and the “This query uses more memory ...

To count distinct values in Excel, you need to add the unique values with the first of the duplicate value. Although it sounds complicated, you will see that there are a few simple formulas to apply ...

The essay analyzes the fundamental reason behind slow SQL statements and provides the solution to make improvements through code samples. Looking ${article} for details. Getting distinct values is, in ...

The syntax for counting the number of unique values from a list of a column using the array formula is as follows: =SUM(IF(COUNTIF(<first cell from which you count the number of unique values>:<last ...

MySQL 使用 MEMORY 引擎临时表实现 count(distinct) 的去重功能时，玩出了新花样，所以，还是值得写一下的。背景说明到此为止 ...