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How can I rename a database column in a Ruby on Rails migration?
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rename_column :table, :old_column, :new_column
You'll probably want to create a separate migration to do this. (Rename FixColumnName as you will.):
script/generate migration FixColumnName
# creates db/migrate/xxxxxxxxxx_fix_column_name....
Differences between INDEX, PRIMARY, UNIQUE, FULLTEXT in MySQL?
...ifferences between PRIMARY, UNIQUE, INDEX and FULLTEXT when creating MySQL tables?
3 Answers
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What are the typical reasons Javascript developed on Firefox fails on IE? [closed]
...pport setting the innerHTML of col, colGroup, frameSet, html, head, style, table, tBody, tFoot, tHead, title, and tr elements. Here's a function which works around that for table-related elements:
function setHTML(elm, html) {
// Try innerHTML first
try {
elm.innerHTML = html;
} catch (exc) {
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Recommended SQL database design for tags or tagging [closed]
I've heard of a few ways to implement tagging; using a mapping table between TagID and ItemID (makes sense to me, but does it scale?), adding a fixed number of possible TagID columns to ItemID (seems like a bad idea), Keeping tags in a text column that's comma separated (sounds crazy but could work)...
What is a “batch”, and why is GO used?
...GO from the following ones in order to work.
For example, you can't drop a table and re-create the same-named table in a single transaction, at least in Sybase (ditto for creating procedures/triggers):
> drop table tempdb.guest.x1
> create table tempdb.guest.x1 (a int)
> go
M...
Add column to SQL Server
I need to add a column to my SQL Server table. Is it possible to do so without losing the data, I already have?
5 Answers...
How to select unique records by SQL
When I perform "SELECT * FROM table" I got results like below:
8 Answers
8
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What are the correct version numbers for C#?
...release in 2002. C# was introduced with .NET Framework 1.0.
The following table lists important features introduced in each version of C#.
And the latest version of C# is available in C# Versions.
1:
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Programmatically creating Markdown tables in R with KnitR
...ver, one thing that I'm not seeing is an easy way to print data frames and tables using Markdown formatting (sort of like xtable , but with Markdown instead of LaTeX or HTML). I know that I can just embed the HTML output from xtable, but I was wondering if there were any Markdown-based solutions?
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Is SQL syntax case sensitive?
...OM, WHERE, etc), but are often written in all caps. However in some setups table and column names are case-sensitive. MySQL has a configuration option to enable/disable it. Usually case-sensitive table and column names are the default on Linux MySQL and case-insensitive used to be the default on Win...