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SQL Query using GROUPBY

 
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pecram24

New User


Joined: 12 Oct 2009
Posts: 35
Location: Chennai

PostPosted: Thu May 20, 2010 9:09 pm    Post subject: SQL Query using GROUPBY
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Hi,

Let us consider the table Employee has the following columns,

Code:
Emp_ID    Join_DT
1         2010-10-12
2         2009-10-12
3         2010-10-12
4         2009-10-12
5         2010-10-12
6         2010-10-12
7         2010-10-12
8         2009-10-12
9         2010-10-12
10        2010-10-12
11        2009-10-12
12        2010-10-12

I Need to display the Year and the number of employees joined in that particular Year.

Can anyone please help me..
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Phrzby Phil

Active Member


Joined: 31 Oct 2006
Posts: 972
Location: Richmond, Virginia

PostPosted: Fri May 21, 2010 12:17 am    Post subject:
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Starter with: see if you can find a function (in the documentation - ur guess) that returns the year from a date column.

Then try just selecting these rows/cols.

Then if that looks good, try grouping.

Incrementally work your way to the solution.
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Escapa

Senior Member


Joined: 16 Feb 2007
Posts: 1399
Location: IL, USA

PostPosted: Fri May 21, 2010 10:25 am    Post subject:
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Code:

SELECT SUBSTR(CHAR(Join_DT),1,4),       
       COUNT(Emp_ID)               
 FROM Employee
 GROUP BY SUBSTR(CHAR(Join_DT),1,4);
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mallik4u

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Joined: 17 Sep 2008
Posts: 75
Location: bangalore

PostPosted: Fri May 21, 2010 4:11 pm    Post subject:
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you can also use YEAR function to extract year part in the date column directly instead of SUBSTR.

SELECT CHAR(YEAR(Join-Dt)), COUNT(Emp_ID)
FROM Employee
GROUP BY CHAR(YEAR(Join_Dt))
WITH UR;
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