Tips & Tricks

Quick migration tips Oracle to Sql server

Rajendra Rawat — Fri, 04 Nov 2005 19:16:00 GMT

Oracle	SQL
PL/SQL	T-SQL
SQL *Plus(sqlplusw)	Query Analyzer (isqlw)
DESC	sp_help, sp_columns, INFORMATION_SCHEMA.COLUMNS
Sequences	Identity
Synonym	Views
DECODE function	CASE expression
BEFORE triggers	INSTEAD OF triggers
SELECT * FROM TAB;	SELECT * FROM sysobjects WHERE type = 'U'
CREATE TABLE AS NEW_TABLE SELECT * FROM EXISTING_TABLE -- WHERE 1=2;	SELECT * INTO NEW_TABLE FROM EXISTING_TABLE -- WHERE 1=2
SELECT CURRENT_DATE FROM DUAL; SELECT SYSDATE FROM DUAL;	SELECT getdate()
INTERSECT operator	Workaround:EXISTS SELECT OrderID, OrderDate FROM Orders O WHERE EXISTS ( SELECT 1 FROM RefundsTable R WHERE O.OrderID = R.OrderID )
MINUS operator	Workaround:EXISTS SELECT OrderID, OrderDate FROM Orders O WHERE NOT EXISTS ( SELECT 1 FROM RefundsTable R WHERE O.OrderID = R.OrderID )
Rownum	Workaround: How to Dynamically Number Rows in a Select Statement

Feel free to add more tips in comments(if any)

Back to DOS

Rajendra Rawat — Thu, 20 Oct 2005 01:35:00 GMT

So you are a master of DOS?

Test 1: Try creating a folder in windows/DOS with name CON

Test 2: Now create a text file - NUL.txt

Tip:DOS device names are reserved words(CON, PRN, AUX, CLOCK$, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, LPT9,aux.c, file.aux or NUL.txt ), and cannot be used as folder or file names

--------------

But where there is a will there is a way;)

The Trick:

mkdir \\.\c:\con

u will have a folder named con in u'r c drive, but now u can't delete
it :)

another trick to delete it is:

rd /S /Q \\.\c:\con

speed up your Acrobat Reader

Rajendra Rawat — Thu, 21 Jul 2005 18:09:00 GMT

Annoyed by frequently having to wait 10-20 seconds for the application to load when all you want to do was view a single page?

Here's how to do it:

Go to :\Program Files\Adobe\Acrobat \Reader \

Move(not copy) all files from the plug_ins folder to the optional folder

You're done.

Now Acrobat Reader is as fast as a notepad!!