distinct records in sql code example
Example 1: select count of distinct values sql
SELECT COUNT (DISTINCT column-name) FROM table-name
Example 2: DISTINCT SQL
SELECT DISTINCT column1, column1, ..... FROM TABLE
Example 3: distinct sql
Distinct: helps to displays the non duplicate
records when retrieving the records from a table.
SELECT DISTINCT FIRST_NAME FROM VISITORS;
Example 4: sql server select rows by distinct column
SELECT a.*
FROM emails a
INNER JOIN
(SELECT email,
MIN(id) as id
FROM emails
GROUP BY email
) AS b
ON a.email = b.email
AND a.id = b.id;