Database

3-Jul-14 6:14

Hello- can you give me any example scenarios/questions for writing a complex SELECT statements? My intention is to improve my SQL skills.

Richard MacCutchan3-Jul-14 6:22

Richard MacCutchan

3-Jul-14 6:22

Start at http://www.w3schools.com/sql/[^].

data modeling guy3-Jul-14 21:02

3-Jul-14 21:02

Thanks

PIEBALDconsult3-Jul-14 6:53

PIEBALDconsult

3-Jul-14 6:53

Sure, try implementing a Turing Machine in SQL.

You'll never get very far if all you do is follow instructions.

data modeling guy3-Jul-14 21:03

3-Jul-14 21:03

Thanks

Eddy Vluggen3-Jul-14 12:24

Eddy Vluggen

3-Jul-14 12:24

data modeling guy wrote:

Hello- can you give me any example
scenarios/questions for writing a complex SELECT statements? My intention is to
improve my SQL skills.

Calculate reputation points of a user.
Fetch the contibutions-section for a user (see the section on your user-page; it contains some statistics)
Fetch the ten members from the database that answered most questions last month.
Fetch the voting-percentages for the straw-poll result for all possible answers.
Fetch any low-repuation member that posts the same message in multiple places, ordered by the amount of similar messages.
Fetch the data to show the forum-content for page 3 of this forum, in threaded view, with 50 posts per page.

Bastard Programmer from Hell Suspicious | :suss:

If you can't read my code, try converting it here[^]

Mycroft Holmes3-Jul-14 15:20

Mycroft Holmes

3-Jul-14 15:20

No no no these suggestions expect him to do the work and write the queries, it sounds like he wants YOU to write the queries and he will study them.

Good luck getting CM to lend out the database and schema Laugh | :laugh:

Never underestimate the power of human stupidity
RAH

data modeling guy3-Jul-14 21:05

3-Jul-14 21:05

Thanks Eddy. I Did some more google search and found some more. Cheers!

SQL convert(datetime, number) wrong?

Jörgen Andersson3-Jul-14 21:28

Jörgen Andersson

3-Jul-14 21:28

Get Joe Celko's Puzzles and Answers[^]

Wrong is evil and must be defeated. - Jeff Ello[^]

Miller Nguyen29-Jun-14 17:38

Miller Nguyen

29-Jun-14 17:38

I tried this

SQL

select convert(datetime, 41818) as mydate

result

SQL

2014-06-30 00:00:00.000

In Excel, it should be

6/28/2014

It's always 2 days in advance

Please help!

Thanks a lot

PIEBALDconsult29-Jun-14 18:45

PIEBALDconsult

29-Jun-14 18:45

Why do you think it's wrong?

SELECT DATEDIFF ( dd , '1900-01-01' , '2014-06-30' )
SELECT DATEADD ( dd, 41818 , '1900-01-01' )

Miller Nguyen wrote:
In Excel, it should be

What do you mean "it should be" ?

You'll never get very far if all you do is follow instructions.

Miller Nguyen29-Jun-14 23:41

Miller Nguyen

29-Jun-14 23:41

I don't say it's wrong, that's why I put the QUESTION MARK in the topic.

I just wonder why Excel and SQL are giving different result

Bernhard Hiller29-Jun-14 22:19

Bernhard Hiller

29-Jun-14 22:19

What the f...? You are right, I tested it.
Look at day number 0: with SQL Server, it is Jan 1, 1900; with Excel: Jan 0, 1900.
The next bug is the leap year: Excel treats 1900 as a leap year (that's wrong!), while SQL Server correctly knows that 1900 is not a leap year.
In sum, those differences account for the 2 days difference in current dates.