Wednesday, October 27, 2010

SQL Server: INSERT INTO with SubQuery


This is a short tutorial on how to insert data with a subquery on SQL Server databases.
The reason I am writing about it is that the required syntax is not that obvious!

Sample tables and data

Let's create two simple tables for this tutorial with the names 'Customers' and 'Orders'.

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1CREATE TABLE [dbo].[Customers](
2    [id] [int] IDENTITY(1,1) NOT NULL,
3    [name] [varchar](100) NOT NULL,
4    [username] [varchar](20) NOT NULL
view source
1CREATE TABLE [dbo].[Orders](
2    [order_id] [int] IDENTITY(1,1) NOT NULL,
3    [customer_id] [int] NOT NULL,
4    [order_date] [datetime] NOT NULL

We are also going to insert a new row on table 'Customers':

view source
1INSERT INTO Customers
2VALUES ('John Smith','john.smith')

Inserting data with a subquery

The obvious syntax to insert data into the orders table with a subquery would be:

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2VALUES ((SELECT id FROM Customers WHERE username = 'john.smith'), GETDATE())

However if you try the above query, you would end up with the following message:

Subqueries are not allowed in this context. Only scalar expressions are allowed.

The correct syntax to accomplish our task is:

view source
2SELECT id, GETDATE() FROM Customers
3WHERE username = 'john.smith'

or if you would like to specify the columns:

view source
1INSERT INTO Orders (customer_id, order_date)
2SELECT id, GETDATE() FROM Customers
3WHERE username = 'john.smith'


Hope you find it useful, especially if you are getting the "Subqueries are not allowed …" error.

Gmail chat – how to type words in bold and italics

Today I have been typing on Gmail chat, and by accident I have found out how to type a word in bold. With a bit more of a search, I have also found out how to type in italics, and also strikethrough a word.

Here is the cheat sheet:

Bold: Surround the word with asterisks, e.g. *word* -> word
Italics: Surround the word with underscores, e.g. _word_ -> word
Strikethrough: Surround the word with hyphens, e.g. -word- -> word

If you know more "secret codes", feel free to leave a comment!

Wednesday, October 20, 2010

Get Current Page Name In Javascript

<script type="text/javascript">

var sPath = window.location.pathname;

var sPage = sPath.substring(sPath.lastIndexOf('/') + 1);