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To list column from table mentioned in sub query (MySQL)


By : Rachel Steele
Date : September 16 2020, 01:00 PM
should help you out Consider the three tables - actors, roles and movies
code :
SELECT DISTINCT a.first_name, a.last_name, r.role 
FROM actors a, roles r, movies m 
WHERE a.id = r.actor_id  and r.movie_id  = m.id and m.name='Schindler\'s List'
ORDER BY first_name;
SELECT DISTINCT a.first_name, a.last_name, r.role 
FROM roles r 
  INNER JOIN  actors a ON a.id = r.actor_id 
  INNER JOIN movies m  ON r.movie_id  = m.id 
WHERE m.name='Schindler\'s List'
ORDER BY first_name;


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MySQL table to column list query


By : JunBugRun
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You can do this in SQL. What you are trying to do is align two lists -- fortunately, you don't care about the order (because you have no column to specify ordering).
The following breaks the data in two pieces, one for the "A" column and one for the "B" column. It then uses a MySQL trick to calculate a sequential number (other databases would use row_number() for this).
code :
select MAX(A), MAX(B)
from ((select @rn1 := @rn1 + 1 as rn, Description as A, NULL as B
       from t cross join (select @rn1 := 0) const
       where A = 1
      ) union all
      (select @rn2 := @rn2 + 1 as rn, NULL as A, Description as B
       from t cross join (select @rn2 := 0) const
       where B = 1
      )
     ) t
group by rn

How to query MySQL as a list of column name and value instead of table


By : user3448188
Date : March 29 2020, 07:55 AM
I wish did fix the issue. If i'm not forgotten, in PostgreSQL I could display query result as a list, for example: , In mysql command line you can do as
code :
select * from tablename \G

query updating a timestamp column not mentioned in list of updates


By : Sifat Nahiyan
Date : March 29 2020, 07:55 AM
may help you . It seems likely your startTime column is defined with something like this.
code :
startTime TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
UPDATE rackusage set  startTime = startTime, totalDuration =".$timeDiff."  ...

How to make a dynamic 'CREATE TABLE' MySQL query from python list of column names and datatypes usin 'pymysql'?


By : user1436500
Date : March 29 2020, 07:55 AM
I hope this helps . I have the following data: , Here you go!
code :
import MySQLdb as mdb



table_name='xyz'
column_names=['c1', 'c2', 'c3', 'c4']
column_datatypes=['VARCHAR(40)', 'BIGINT(40)', 'BIGINT(20)', 'VARCHAR(10)']

db=mdb.connect(host='localhost',user='root',passwd='*****',db='test',port=3306)
cursor=db.cursor()

create_stement='create table '+table_name + '('
i=0
while i< len(column_names)-1 :

    create_stement =create_stement +column_names[i] +'  '+column_datatypes[i]+' ,'
    i=i+1

create_stement =create_stement +column_names[i] +'  '+column_datatypes[i]+' )'

print(create_stement)
cursor.execute(create_stement)
print('Done')

Why is there new column error when there is no any named column mentioned in query?


By : Suda
Date : March 29 2020, 07:55 AM
seems to work fine Later on, I found that As I was working on the existing database and customize the full system, there was some trigger exist on that 'payment' table and error was coming due to trigger.
So sales_id in error was coming due to existing trigger in database.
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