Combine Unique Data in Oracle SELECT COUNT DISTINCT Example

How To SELECT Combine Unique Data COUNT DISTINCT Oracle Database Tutorial Example

Run Query Editor then copy & paste the below code to count number of combine unique data or rows by using SELECT COUNT DISTINCT keyword from a table in Oracle Database Server Tutorial Example

   -- CONNECT AS HR
   -- Let's count how many combine unique DEPARTMENT and SALARY data in HR.EMPLOYEES table

   SELECT COUNT(1)
   FROM ( SELECT DISTINCT DEPARTMENT_ID,SALARY FROM EMPLOYEES );

      -- That's it!! DISTINCT(Unique) Combine DEPARTMENT and SALARY data count has been selected in oracle database
      -- is comment in Oracle
      -- in fact it is comment in MSSQL and MySQL as well
   

How To SELECT Combine Unique Data COUNT DISTINCT Oracle Database Tutorial Example - Result in Query Editor Client Tools