![]() ![]() In the properties windows, also we get more details around the sort operator including memory allocation, statistics, and the number of rows. You can hover the mouse over the sort operator, and it opens a tool-tip with the operator details. In this execution plan, you can see top resource consuming operators: You need to enable the Actual Execution Plan from the SSMS Menu bar as shown below.Įxecute the query to get an Actual execution plan. Let’s look at the Actual Execution Plan of the SQL COUNT DISTINCT function. It does not eliminate the NULL values in the output.Įxecution Plan of SQL Count distinct function It eliminates the NULL values in the output. It gives a distinct number of rows after eliminating NULL and duplicate values. It considers all rows regardless of any duplicate, NULL values. It returns the distinct number of rows after satisfying conditions specified in the where clause. It returns the total number of rows after satisfying conditions specified in the where clause. ![]() Similarly, you can see row count 6 with SQL COUNT DISTINCT function.ĭifference between SELECT COUNT, COUNT(*) and SQL COUNT distinct In the output, we can see it does not eliminate the combination of City and State with the blank or NULL values. ![]() Let’s create a sample table and insert few records in it. It also includes the rows having duplicate values as well. It means that SQL Server counts all records in a table. We can use SQL Count Function to return the number of rows in the specified condition.īy default, SQL Server Count Function uses All keyword. We want to know the count of products sold during the last quarter. Suppose we have a product table that holds records for all products sold by a company. We use SQL Count aggregate function to get the number of rows in the output. Let’s go ahead and have a quick overview of SQL Count Function. Suppose we want to get distinct customer records that have placed an order last year. Sometimes, we want to get all rows in a table but eliminate the available NULL values. This article explores SQL Count Distinct operator for eliminating the duplicate rows in the result set.Ī developer needs to get data from a SQL table with multiple conditions. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |