is sql queries case sensitive code example

Example 1: sql like case sensitive

-- Postgresql case insensitive:
SELECT * FROM people WHERE name ILIKE 'JOHN'
-- John
-- JOHN
-- john

Example 2: sql server case sensitive search

SELECT 1
FROM dbo.Customers
WHERE   CustID = @CustID COLLATE SQL_Latin1_General_CP1_CS_AS
    AND CustPassword = @CustPassword COLLATE SQL_Latin1_General_CP1_CS_AS