The COUNT DISTINCT in SQL has always been relatively slow. De-duplication is essentially a grouping operation that requires retaining all the traversed grouping field values for subsequent comparisons ...

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 ...

If you want to learn how to count unique values in Excel, you've come to the right place. Any kind of spreadsheet will contain both unique and distinct values. Unique values only appear once in a list ...

One major reason Microsoft Excel spreadsheets are so popular is the ability to process the data entered on a sheet easily. For instance, if you are planning a wedding and individually listing expenses ...

SINGAPORE, Nov. 1, 2023 /PRNewswire/ — TiDB is an advanced open-source, distributed SQL database that has embraced the MySQL ecosystem since its inception. TiDB is wire compatible with MySQL’s ...

Microsoft Excel is a widely used tool, especially in the business world. It can handle various tasks, from basic data entry to complex financial analyses. One essential skill for working with data in ...

-- 01: Distinct Countries from Customers -- Description: This SQL query retrieves a list of distinct countries from the "Customers" table. SELECT DISTINCT country FROM Customers; -- 02:Total Customer ...

从上述结果可以看出，count(*)和count(name)的值不一样，即当使用的是 count(name) 查询时，就丢失了两条值为 NULL 的数据。 解决 ...