Displaying 4 results from an estimated 4 matches for "new_column".
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new_column_1
2012 Aug 29
4
Use or ??
Hi, My data frame looks like
A B C
a b a
x y z
I want to add a new column which says "y" if either A or B matches with C and "n" if there is no match. How can I do that?
Thanks
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2006 Apr 10
1
Add Column After Column in Migrations
Adding a column to a table just places the column at the end, but I
like to keep related columns together. Is there a way to specify
where the column is added in a table with migrations? For example, in
MySQL you can do:
ALTER TABLE my_table ADD COLUMN new_column INT AFTER other_column
I was hoping migrations would support something like this:
add_column :my_table, :new_column, :integer, :after => :other_column
I couldn''t find anything mentioned in the documentation or in a quick
search of this mailing list.
Thanks,
Ryan
2010 May 13
2
Adding name to nth row
Hello,
I have a data frame with many rows, and I want to create a column with
a name only at every 12th row, starting from 97 to 278.
Thanks in advance!
2008 Feb 13
4
Migration Issues: Can't update newly added column values
Hello everyone, just wondering if anyone can help me with a migrations
question here.
Using:
rails 2.0.2
ruby 1.8.6 (2007-09-24 patchlevel 111) [i386-mswin]
mysql 5.0.45
Platform:
windows xp
The problem:
----------
I created a migration that is designed to add a column named
"deleted_at" (timestamp) and then remove a column named
"is_deleted" (boolean). The idea is to