Can we use distinct with Count in SQL?

Yes, you can use COUNT() and DISTINCT together to display the count of only distinct rows. SELECT COUNT(DISTINCT yourColumnName) AS anyVariableName FROM yourTableName; To understand the above syntax, let us create a table. If you do not use DISTINCT, then COUNT() function gives the count of all rows.

How can I count distinct records in mysql?

SELECT lid and the aggregate COUNT of DISTINCT IP FROM my table GROUP BY lid ….The important ones here being:

1. get -> SELECT.
2. count -> COUNT.
3. unique -> DISTINCT.
4. aggregate..for each -> SELECT .. GROUP BY

How can I count distinct values of all columns in SQL?

3 Answers. The basic query is: select col001, count(*) from MyTable group by col001 union all select col002, count(*) from MyTable group by col002 union all . . . select col700, count(*) from MyTable group by col700 ; Not pleasant, but that is basically the query you need to run.

How do I use count and distinct together in SQL Server?

6 Answers. DISTINCT COUNT(*) will return a row for each unique count. What you want is COUNT(DISTINCT ) : evaluates expression for each row in a group and returns the number of unique, non-null values.

Can I use distinct and group by together?

Well, GROUP BY and DISTINCT have their own use. GROUP BY cannot replace DISTINCT in some situations and DISTINCT cannot take place of GROUP BY. It is as per your choice and situation how you are optimizing both of them and choosing where to use GROUP BY and DISTINCT.

How do I count unique values in a column in MySQL?

MySQL COUNT(DISTINCT) function returns a count of number rows with different non-NULL expr values. Where expr is a given expression. The following MySQL statement will count the unique ‘pub_lang’ and average of ‘no_page’ up to 2 decimal places for each group of ‘cate_id’.

How do I use count and distinct in the same query?

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.

What is Count distinct?

COUNT() with the DISTINCT clause removes duplicate rows of the same data in the result set. It also removes ‘NULL’ values in the result set. 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.

How can I count distinct of two columns in SQL?

SQL databases can work with tuples like values so you can just do: SELECT COUNT(DISTINCT (DocumentId, DocumentSessionId)) FROM DocumentOutputItems; If your database doesn’t support this, it can be simulated as per @oncel-umut-turer’s suggestion of CHECKSUM or other scalar function providing good uniqueness e.g. COUNT( …

How do you count distinct?

To count the number of different values that are stored in a given column, you simply need to designate the column you pass in to the COUNT function as DISTINCT . When given a column, COUNT returns the number of values in that column. Combining this with DISTINCT returns only the number of unique (and non-NULL) values.

Is GROUP BY better than distinct?

While DISTINCT better explains intent, and GROUP BY is only required when aggregations are present, they are interchangeable in many cases.

How do you count distinct values in SQL?

SQL COUNT(*) The purpose of SQL COUNT(*) is to count the number of lines returned by the SQL query. To count the number of rows in the revenues table, we use the following statement: select count(*) from revenues. You can put the keyword distinct followed by a column name inside the parenthesis instead of a star.

How do you select distinct in SQL?

The SQL SELECT DISTINCT Statement. The SELECT DISTINCT statement is used to return only distinct (different) values. Inside a table, a column often contains many duplicate values; and sometimes you only want to list the different (distinct) values.

What does count distinct mean?

Distinct Product Count. The number of products (resulting from different collections) used for this substance administration. EXAMPLE(S): If blood is taken from 2 people (two donations from one of them), this would be counted as 3 different collections. NOTE(S): This is a count of distinct donations, typically used for stem cell transplants.

How to get distinct values in SQL query?

Sometimes, you may want to get only distinct values in a specified column of a table. To do this, you use the SELECT DISTINCT clause as follows: The query returns only distinct values in the specified column. In other words, it removes the duplicate values in the column from the result set.