Comments for SQL Tutorial - Learn SQL Online

Comment on SQL Min by Peter

Peter — Sun, 11 Dec 2011 02:40:26 +0000

I think the function MIN should not be used in Where clause.

Comment on SQL Min by illegal

illegal — Sat, 10 Dec 2011 11:14:58 +0000

please tell which illegal has :

select stockName
from stock
where MIN(price) > 10.0;

Comment on Point In Polygon by George Mastros

George Mastros — Tue, 06 Dec 2011 22:59:35 +0000

I believe there is an error in the code. If I understand this correctly, then the first time through the loop you are comparing the first point with the second to last point because of this line: SET @j=@nvert-1. I think it should be: SET @j=@nvert (without the -1) so that the first point of the polygon is compared against the last point.

I was able to verify this incorrect output using my application. I point that is obviously within the polygon was being reported as outside.

Comment on SQL NULLIF by Essy

Essy — Tue, 06 Dec 2011 01:27:33 +0000

All of these artcleis have saved me a lot of headaches.

Comment on SQL SELF JOIN by venugopal rao

venugopal rao — Fri, 04 Nov 2011 18:44:26 +0000

WHAT IS A TUPLE?EXPLAIN?

Comment on SQL SUBSTRING by Peter

Peter — Mon, 31 Oct 2011 10:54:23 +0000

It depends which database you use. As I said, it was mySQL syntax. If you use mySQL, you could use SUBSTRING(SUM_DMO,3) instead of SUBSTRING(SUM_DMO,3,2).

Comment on SQL SELF JOIN by admin

admin — Fri, 28 Oct 2011 11:16:56 +0000

Because the employee’s name is Mazojys Fxoj:

Select all the employees at the same department with Mazojys Fxoj

Comment on SQL NOW by Alizya

Alizya — Wed, 26 Oct 2011 05:57:37 +0000

You teach sql and in simple manners. I thought that sql is very diffiult language but after reading this post i have understand the functions of NOW() and getdate() easily. thanks for sharing.
Alizya recently posted..TCTV

Comment on SQL DATE_FORMAT by Free Web Hosting providers

Free Web Hosting providers — Wed, 19 Oct 2011 04:52:33 +0000

Date It’s a most difficult part for sql query because the matches of format of the date column in the database. And when you show the following table, it is the important built in date functions in MySQL.