Can distinct be used in where clause?

By using the WHERE clause with a DISTINCT clause in MySQL queries, we are putting a condition on the basis of which MySQL returns the unique rows of the result set.

How do I find the distinct value?

In Excel, there are several ways to filter for unique values—or remove duplicate values:

  1. To filter for unique values, click Data > Sort & Filter > Advanced.
  2. To remove duplicate values, click Data > Data Tools > Remove Duplicates.

How count distinct rows in SQL Server?

We can use SQL Count Function to return the number of rows in the specified condition. The syntax of the SQL COUNT function: COUNT ([ALL | DISTINCT] expression); By default, SQL Server Count Function uses All keyword.

Can we use distinct in subquery?

A DISTINCT clause and a GROUP BY without a corresponding HAVING clause have no meaning in IN/ALL/ANY/SOME/EXISTS subqueries. The reason is that IN/ALL/ANY/SOME/EXISTS only check if an outer row satisfies some condition with respect to all or any row in the subquery result.

What is difference between unique and distinct in SQL?

The UNIQUE keyword in SQL plays the role of a database constraint; it ensures there are no duplicate values stored in a particular column or a set of columns. On the other hand, the DISTINCT keyword is used in the SELECT statement to fetch distinct rows from a table.

How do you count distinct values in SQL?

Calculate number of records in a table: Type SELECT COUNT (*)[Enter]FROM table name;

  • Identify number of unique values in a column: Type SELECT COUNT (DISTINCT column name)[Enter]FROM table name;
  • Number of records matching criteria: Type SELECT COUNT (*)[Enter]FROM table name[Enter]WHERE column name <,=,or > number;

    • How do you select distinct in SQL?

    SELECT DISTINCT columns FROM table… You can simply add the word DISTINCT after your SELECT keyword. You can also add the DISTINCT keyword inside aggregate functions: SELECT aggregate_function(DISTINCT column) FROM table… We’ll see some examples of this below. Invalid DISTINCT Syntax

    How to COUNT DISTINCT values over multiple columns using SQL?

    How to count distinct values over multiple columns using SQL. Often we want to count the number of distinct items from this table but the distinct is over multiple columns. Method-1 Using a derived table (subquery) You can simply create a select distinct query and wrap it inside of a select count(*) sql, like shown below: SELECT COUNT(*)

    What is SELECT DISTINCT in SQL?

    A demo of simple SELECT – DISTINCT.

  • Using WHERE clause with DISTINCT.
  • The example of COUNT function with DISTINCT.
  • The DISTINCT clause with GROUP BY example.
  • Using HAVING clause with DISTINCT.
  • The DISTINCT clause with ORDER BY example.
  • Using multiple columns in the DISTINCT clause.