how to check char length of a column in sql code example

Example 1: mysql string length

-- Relevant for MySQL only

-- syntax
LENGTH(<your-string>)

-- example
LENGTH('CountCharacters') -- OUTPUT: 15
        123456789012345

-- example with query 
SELECT 'CountCharacters',LENGTH('CountCharacters')
FROM DUAL;

-- OUTPUT: CountCharacters, 15

Example 2: sql string length

-- Relevant for SQL-Oracle only

-- syntax
LENGTH(<your-string>)

-- example
LENGTH('CountCharacters') -- OUTPUT: 15
        123456789012345

-- example with query 
SELECT 'CountCharacters',LENGTH('CountCharacters')
FROM DUAL;

-- OUTPUT: CountCharacters, 15