Re: Concatenate 2 Column Values For One Column

On 05/08/2018 07:17 PM, tango ward wrote:
> Hi,
>
> Sorry for asking question again.
>
> I am trying to concatenate the value of column firstname and lastname
> from source DB to name column of destination DB.
>
> My code so far:
>
> cur_t.execute("""
>                 SELECT firstname, lastname
>                 FROM authors;
>                 """)
>
> for row in cur_t:
>     cur_p.execute("""
>                      INSERT INTO lib_author (
>                                                  created, modified,
> last_name,
>                                                  first_name, country,
>                                                  school_id, name)
>                     VALUES (current_timestamp, current_timestamp, %s,
> %s, %s,
>                             (SELECT id FROM ed_school WHERE name='My
> Test School'),
>                             (SELECT CONCAT(first_name, ',', last_name)
> AS name FROM lib_author LIMIT 1)
>                             )
>                     """, (row['lastname'], row['firstname'], ''))
>
> The code will take the first and lastname of the FIRST data existing on
> the destination table. I modified the code, instead of running SELECT
> and CONCAT, I passed string formatter and call the row['firstname'],
> row['lastname']
>
> for row in cur_t:
>     cur_p.execute("""
>                      INSERT INTO lib_author (
>                                                  created, modified,
> last_name,
>                                                  first_name, country,
>                                                  school_id, name)
>                     VALUES (current_timestamp, current_timestamp, %s,
> %s, %s,
>                             (SELECT id FROM ed_school WHERE name='My
> Test School'),
>                              %s
>                             )
>                     """, (row['lastname'], row['firstname'], '',
> (row['firstname'], row['lastname']) )
>
> The second code works but it includes the parenthesis in the DB.

That is because:

(row['firstname'], row['lastname'])

is making a Python tuple for entry into the last %s.

Not tested but try:

(row['firstname'] + ', ' + row['lastname'])

>
> How can I remove the ( ) in the DB? I can't call the row['firstname']
> and row['lastname'] as values without using ( ).
>
> Any suggestion is highly appreciated.
>
> Thanks,
> J

--
Adrian Klaver
adrian(dot)klaver(at)aklaver(dot)com