db2 query
I have one table with the following details.
SNO SNAME DOJ
------ -------------------- ----------
10 KRISH 2007-03-19
20 REDDY 2007-05-19
30 RRRRR 2007-05-19
40 BBBBB 2008-05-19
50 CCCCC 2009-05-19
60 JJJJJ 2009-05-19
70 JJJJJ 2004-05-19
i want the output in the following format:( no of students
joined in each year(no nedd to consider about month and
date)
year count
--------- ----------
2004 1
2007 3
2008 1
2009 2
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Answer Posted / sambit mohapatra
select distinct substr(DOJ,(1,4)),count(*) from emp_tbl
group by DOJ
I hope that this quey is work fine and let me know the
result.
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SET is the ANSI standard for variable assignment, SELECT is not. SET can only assign one variable at a time, SELECT can make multiple assignments at once. If assigning from a query, SET can only assign a scalar value. If the query returns multiple values/rows then SET will raise an error. SELECT will assign one of the values to the variable and hide the fact that multiple values were returned (so you'd likely never know why something was going wrong elsewhere - have fun troubleshooting that one) When assigning from a query if there is no value returned then SET will assign NULL, where SELECT will not make the assignment at all (so the variable will not be changed from it's previous value) As far as speed differences - there are no direct differences between SET and SELECT. However SELECT's ability to make multiple assignments in one shot does give it a slight speed advantage over SET.
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