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How to drop columns using Rails migration
What's the syntax for dropping a database table column through a Rails migration?
20 Answers
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How do I list the symbols in a .so file
...objdump -TC libz.so
libz.so: file format elf64-x86-64
DYNAMIC SYMBOL TABLE:
0000000000002010 l d .init 0000000000000000 .init
0000000000000000 DF *UND* 0000000000000000 GLIBC_2.2.5 free
0000000000000000 DF *UND* 0000000000000000 GLIBC_2.2.5 __errno_location
0000...
Cloning a MySQL database on the same MySql instance
... you... There's no way to do this within MySQL afaik (except by hand, one table / view at a time)
– Greg
Mar 23 '09 at 21:50
42
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Best dynamic JavaScript/JQuery Grid [closed]
...
Free:
Gijgo Grid
Backgrid.js
Flexigrid
jqGridView
Ingrid
SlickGrid
DataTables
Shield UI Lite Grid
Paid:
Fancy Grid
jQuery Grid
jqxGrid
Shield UI Grid
The best entries in my opinion are Flexigrid and jQuery Grid.
sh...
How to make an inline-block element fill the remainder of the line?
...e using CSS and two inline-block (or whatever) DIV tags instead of using a table?
7 Answers
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How to change column datatype from character to numeric in PostgreSQL 8.4
...rom old to new type.
So this might work (depending on your data):
alter table presales alter column code type numeric(10,0) using code::numeric;
-- Or if you prefer standard casting...
alter table presales alter column code type numeric(10,0) using cast(code as numeric);
This will fail if you h...
How to save a data.frame in R?
...ta.Rda")
Then load it with:
load("data.Rda")
You could also use write.table() or something like that to save the table in plain text, or dput() to obtain R code to reproduce the table.
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How to implement the activity stream in a social network
...rowse far back in time (if you even offer this)
I use a plain old MySQL table for dealing with about 15 million activities.
It looks something like this:
id
user_id (int)
activity_type (tinyint)
source_id (int)
parent_id (int)
parent_type (tinyint)
time (...
Replace all 0 values to NA
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What would the equivalent syntax be for a data.table object?
– itpetersen
Dec 7 '14 at 5:33
6
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How do MySQL indexes work?
...ically, how can they return the data requested without scanning the entire table?
8 Answers
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