Select count distinct

This example returns the number of different titles that an Adventure Works Cycles employee can hold. DISTINCT for multiple columns is not supported. SELECT COUNT (DISTINCT programname) AS Count, programtype AS Type FROM cmproduction WHERE pushnumberpushnumber GROUP BY programtype DISTINCT COUNT will return a row for each unique count.

Employee GO Here is the result set.- (row(s) affected) B. What you want is COUNT (DISTINCT expression evaluates expression for each row in a group and returns the number of unique, non-null values). SELECT DISTINCT eliminates duplicate records from the. SELECT DISTINCT returns only distinct (different) values. SQL COUNT with DISTINCT : SQL COUNT function with DISTINCT clause eliminates the repetitive appearance of a same data.

For the demo, I am using employee table that stores the information about the employees. You may also use the COUNT SQL function for getting the number of records as using the DISTINCT clause.

WITH cte AS ( SELECT DISTINCT ValVal ValFROM Table ) SELECT COUNT (1) FROM cte To answer the question, From the documentation. Using COUNT This example returns the total number of Adventure Works Cycles employees. The example of COUNT function with DISTINCT. The function returns only count for the rows returned after DISTINCT clause.

Inside a table, a column often contains many duplicate values and sometimes you only want to list the different (distinct) values. You can use the count function in a select statement with distinct on multiple columns to count the distinct rows. The SELECT DISTINCT statement is used to return only distinct (different) values.

Specifies that all rows should be counted to return the total number of rows in a table.

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COUNT takes no parameters and cannot be used with DISTINCT. DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc. COUNT function and SELECT with DISTINCT on multiple columns.

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