SQL 'AS' statement Error in MySQL

Question

I am trying to do the following sql to return 3 latest blog details from MySQL database, though getting the error, what I am missing here?

SELECT   tblpost_id, 
         post_title, 
         img_url, 
         img_date, 
         post_catg, 
         'post_contentL' AS substr(post_content,1,23) 
FROM     tblpost 
ORDER BY tblpost_id DESC 
LIMIT    3

I tried in the sql command window and its giving me the error as

#1064 - Erreur de syntaxe près de 'SUBSTR(post_content,1,23) FROM tblge_post ORDER BY tblge_post_id DESC LIMIT 3' à la ligne 1

and in the php I am trying the following code to display it, * all the mysql php retrieval objects are working fine.

$row['post_contentL']

Please help me to identify the problem.

Answer 1

It is the other way round. Substitute this:

'post_contentL' AS SUBSTR(post_content,1,23)

with:

SUBSTR(post_content,1,23) AS post_contentL

Answer 2

Alias name should come after the Column name. You have reversed it

SELECT tblpost_id, 
       post_title, 
       img_url, 
       img_date, 
       post_catg, 
       Substr(post_content, 1, 23) AS `post_contentL` --here 
FROM   tblpost 
ORDER  BY tblpost_id DESC 
LIMIT  3 

Answer 3

it is not a valid query, Alias should be named after query functions

'post_contentL' AS SUBSTR(post_content,1,23) 

should be with 'AS'

SUBSTR(post_content,1,23) AS 'post_contentL'

OR without AS

SUBSTR(post_content,1,23) 'post_contentL'