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1. www.w3resource.com › sql › aggregate-functionsSQL COUNT () with distinct - w3resource

   www.w3resource.com › sql › aggregate-functions

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   11 lip 2024 · In SQL, the COUNT () function is used to count the number of rows that match a specified condition. The DISTINCT keyword is used to return only distinct (unique) values. When combined, COUNT and DISTINCT can be used to count the number of unique values in a column or a set of columns.

   • With Having

     SQL COUNT() with HAVING: The HAVING clause with SQL COUNT()...

   • SQL Aggregate Functions

     The SQL COUNT function returns the number of rows in a table...

   • AVG Function

     Additionally, it calculates the count of rows (COUNT(*)) for...

   • MIN Function

     The aggregate function SQL MIN() is used to find the minimum...

   • MAX Function

     SQL MAX() function: The aggregate function SQL MAX() is used...

   • SUM Function

     DISTINCT: Return the SUM of unique values. expression:...

2. stackoverflow.com › questions › 141562SQL to find the number of distinct values in a column

   stackoverflow.com › questions › 141562

   5 kwi 2019 · You can use the DISTINCT keyword within the COUNT aggregate function: SELECT COUNT(DISTINCT column_name) AS some_alias FROM table_name This will count only the distinct values for that column.

3. www.w3schools.com › sql › sql_countSQL COUNT() Function - W3Schools

   www.w3schools.com › sql › sql_count

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   Learn how to use the SQL COUNT () function to return the number of rows that match a criterion. See examples of how to specify a column, add a WHERE clause, ignore duplicates, use an alias and COUNT () with GROUP BY.

4. learn.microsoft.com › en-us › sqlCOUNT (Transact-SQL) - SQL Server | Microsoft Learn

   learn.microsoft.com › en-us › sql

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   3 wrz 2024 · COUNT(DISTINCT *expression*) evaluates expression for each row in a group, and returns the number of unique, nonnull values. COUNT is a deterministic function when used without the OVER and ORDER BY clauses.

5. www.sqltutorial.org › sql-aggregate-functions › sql-countSQL COUNT: The Ultimate Guide To SQL COUNT Function - SQL...

   www.sqltutorial.org › sql-aggregate-functions › sql-count

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   Learn how to use the SQL COUNT function to get the number of rows or distinct values in a group. See examples of COUNT (*), COUNT (DISTINCT expression) and COUNT with GROUP BY, HAVING and ORDER BY clauses.

6. www.mssqltips.com › sqlservertip › 7471SQL COUNT and SQL COUNT DISTINCT in SQL Server

   www.mssqltips.com › sqlservertip › 7471

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   22 lis 2022 · SQL COUNT DISTINCT. Using the DISTINCT clause with the aggregate function COUNT works by adding the keyword within the parentheses and before the column name to be counted in the SELECT statement.

7. www.baeldung.com › sql › count-distinct-valuesHow to Count the Number of Distinct Values in a SQL Column -...

   www.baeldung.com › sql › count-distinct-values

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   18 lip 2024 · Counting unique values in a SQL column is straightforward with the DISTINCT keyword. Here, let’s see how to effectively count distinct entries and apply filters for more specific data insights. 2.1. Sample Dataset