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I can select all the distinct values in a column in the following ways:
SELECT DISTINCT column_name FROM table_name;SELECT column_name FROM table_name GROUP BY column_name;But how do I get the row count from that query? Is a subquery required?
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The COUNT DISTINCT function returns the number of unique values in the column or expression, as the following example shows. SELECT COUNT (DISTINCT item_num) FROM items; If the COUNT DISTINCT function encounters NULL values, it ignores them unless every value in the specified column is NULL.
You can use the combination of the SUM and COUNTIF functions to count unique values in Excel. The syntax for this combined formula is = SUM(IF(1/COUNTIF(data, data)=1,1,0)). Here the COUNTIF formula counts the number of times each value in the range appears.
The correct syntax for using COUNT(DISTINCT) is: SELECT COUNT(DISTINCT Column1) FROM Table; The distinct count will be based off the column in parenthesis. The result set should only be one row, an integer/number of the column you're counting distinct values of.
The syntax of the SQL COUNT function:COUNT ([ALL | DISTINCT] expression); By default, SQL Server Count Function uses All keyword. It means that SQL Server counts all records in a table. It also includes the rows having duplicate values as well.
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.
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