Distinct Function

The SQL SELECT DISTINCT Statement

In a table, some of the columns may contain duplicate values. This is not a problem, however,
 sometimes you will want to list only the different (distinct) values in a table.

The DISTINCT keyword can be used to return only distinct (different) values.

SQL SELECT DISTINCT Syntax
SELECT DISTINCT column_name(s)
FROM table_name

SELECT DISTINCT City FROM emp_info;


SQL WHERE Clause

The WHERE clause is used to extract only those records that fulfill a specified criterion

SELECT * FROM Emp_info
WHERE City='Mumbai'
Use Quotes Around Text Fields
SQL uses single quotes around text values (most database systems will also accept double quotes).

However, numeric values should not be enclosed in quotes.