Question

How can I use an alias in the same statement? See the body alias in the statement below. When I use it in sum(length(body), I get unknown column.

SELECT substring_index(userBody, ' ', 60) as body, SUM(LENGTH(body)-LENGTH(REPLACE(body,' ',''))+1) as wordCount 
from articles where artcId = 10;

Answer 1

You can’t use body alias name in the next select column, Better use the same ‘alias’ block in the following sections. See the below query for more clarification.

SELECT 
  substring_index(userBody, ' ', 60) AS body,
  SUM(
    LENGTH(substring_index(userBody, ' ', 60)) - LENGTH(REPLACE(substring_index(userBody, ' ', 60),' ',''))+1
  ) AS wordCount
FROM articles
WHERE artcId = 10;