Collections:
Count Duplicated Values in a Column in Oracle
How To Count Duplicated Values in a Column in Oracle?
✍: FYIcenter.com
If you have a column with duplicated values, and you want to know what are those duplicated values are and how many duplicates are there for each of those values, you can use the GROUP BY ... HAVING clause as shown in the following example. It returns how many duplicated first names in the employees table:
SQL> SELECT first_name, COUNT(*) FROM employees GROUP BY first_name HAVING COUNT(*) > 1; FIRST_NAME COUNT(*) -------------------- ---------- Peter 3 Michael 2 Steven 2 John 3 Julia 2 William 2 Karen 2 Kevin 2 ......
2019-11-21, 775👍, 0💬
Popular Posts:
How AdventureWorksLT tables are related in SQL Server? There are 12 user tables defined in Adventure...
What Do You Need to Connect PHP to MySQL in MySQL? If you want to access MySQL database server in yo...
How To Replace Given Values with NULL using NULLIF() in SQL Server Transact-SQL? Sometime you want t...
How To Generate CREATE VIEW Script on an Existing View in SQL Server? If you want to know how an exi...
How To Verify Your PHP Installation in MySQL? PHP provides two execution interfaces: Command Line In...