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Merge two tables (CSV) if (table1 column A == table2 column A)


Merge two tables (CSV) if (table1 column A == table2 column A)

By : Sandra Johnston
Date : November 21 2020, 04:03 PM
wish of those help I have two CSV's, openable in Numbers or Excel, structured: , Use a dict:
code :
with open('file1.csv', 'rb') as file_a, open('file2.csv', 'rb') as file_b:
    data_a = csv.reader(file_a)
    data_b = dict(csv.reader(file_b))  # <-- dict
    with open('out.csv', 'wb') as file_out:
        csv_out = csv.writer(file_out)
        for word, num_a in data_a:
            csv_out.writerow([word, num_a, data_b.get(word, '')])  # <-- edit


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MySQL - is it legal to do 'SELECT table1.*,table2.column FROM table1,table2'?

MySQL - is it legal to do 'SELECT table1.*,table2.column FROM table1,table2'?


By : user1592686
Date : March 29 2020, 07:55 AM
MySQl Query: copy a column named 'C' from table2 to column 'C' in table1 without losing any other column data

MySQl Query: copy a column named 'C' from table2 to column 'C' in table1 without losing any other column data


By : user3452750
Date : March 29 2020, 07:55 AM
wish of those help Assuming the Table1 already contains the C column and you can Join by id:
code :
UPDATE table1 t1 JOIN table2 t2 ON t1.id = t2.id
SET t1.col1 = t2.col2, t1.col2 = t2.col2
Join Table1 with Table2 using Table1 column values in Table2's conditionals

Join Table1 with Table2 using Table1 column values in Table2's conditionals


By : user3532734
Date : March 29 2020, 07:55 AM
This might help you If you use a Common Table Expression CTE you can use it to join to your other statement
code :
with var as 
( SELECT ROW_NUMBER() OVER(order by cola) as [id], cola
  FROM Table1)


SELECT var.id  AS [Cola], (

            SELECT COUNT(*)
              FROM vwTableA AS Z
             WHERE Cola = COALESCE(var.id,Cola)
               AND NOT EXISTS (

                        SELECT * 
                          FROM TableB
                         WHERE Colb = Z.Colb

                              )

  ) AS [NewCol1],
  (

            SELECT COUNT(*)
              FROM vwTableB AS Y
             INNER JOIN TableC AS C
                ON Y.Colc = C.Colc
             WHERE Y.Cola = var.id

  ) AS [NewCol2],
  (

            SELECT COUNT(*)
              FROM vwTableC AS X
             INNER JOIN TableD AS D
                ON X.Colc = D.Colc
             WHERE X.Cola = var.id

  ) AS [NewCol3]
FROM var
Compare columns on two tables, and update table1 if it's column matches a column in table2

Compare columns on two tables, and update table1 if it's column matches a column in table2


By : rajaaa neta
Date : March 29 2020, 07:55 AM
To fix this issue to update table1 and set the column to TRUE if the email was not found in the other table and FALSE if it exists, you can use a LEFT JOIN
code :
update table1
left join table2 on table1.email = table2.email
set table1.bool_col = case when table2.email is null 
                           then 'true'
                           else 'false'
                      end
Update table1 column values to table2 column valueswith existing ID in table1, Update Multiple records at a time

Update table1 column values to table2 column valueswith existing ID in table1, Update Multiple records at a time


By : harsh budhraja
Date : March 29 2020, 07:55 AM
wish help you to fix your issue , Try this
code :
UPDATE t1
SET t1.field_name = t2.field_name
    ,t1.field_2 = t2.field_2
FROM table_1 t1
INNER JOIN table_2 t2 ON t1.id = t2.id
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