WOW!!! THAT WAS AWESOME!!!
Thanks a lot Peter. Ok, so what is SUM(1)? How is it able to do this? And where
can I learn more about it?
Thanks again.
>>> Peter Brawley <[EMAIL PROTECTED]> 4/4/06 10:13:00 PM >>>
Ed,e: Thanks for the quick reply Peter. Unfortunately, this is all legacy stuff
that I have to make work together and the problemreport table does not
reference the employeeid in the employees table. It was all create about ten
years ago and the data has just always been migrated to the db du jour. I'm
currently using MySQL 4.1x but most importantly I must be able to run the
entire query in a single call. Thanks for the help. OK, that's doable in a
subquery, and you can get the total from SUM(1), so something like ...
SELECT
IF( SUM(1) = 0,
'',
CONCAT( 'You have ',
SUM(1),
' Problem Report',
IF(SUM(1) = 1,'','s'),
': Priorities(High=',
SUM(IF(Priority='High',1,0)),
',Med=',
SUM(IF(Priority='Med',1,0)),
',Low=',
SUM(IF(Priority='Low' ,1,0)),
')'
)
)
FROM (
SELECT Priority
FROM ProblemReports, Employees
WHERE ProblemReports.Status='Open'
AND ProblemReports.Responsible=CONCAT(Employees.FirstName, '
',Employees.LastName)
AND Employees.DateTerminated IS NULL
AND Employees.UserName='User1'
) AS priorities;
PB
-----
Peter Brawley <[EMAIL PROTECTED]> 4/4/06 2:35:49 PM >>> Ed,The big
slowdown in your query is likely the join on ProblemReports.Responsible =
CONCAT(Employees.FirstName, ' ',Employees.LastName)) Eek. Does the employees
table not have a primary key, and does the problemreports table not reference
that key? If not, I would think a first priority would be to fix
that.Meanwhile, you can simplify your monster query by writing the user's
problem priorities to a temp table, then doing a simple pivot on priority to
generate your sentence. Something like ...DROP TEMPORARY TABLE IF EXISTS
ProbSum;CREATE TEMPORARY TABLE ProbSumSELECT Priority FROM ProblemReports,
Employees WHERE ProblemReports.Status='Open' AND
ProblemReports.Responsible=CONCAT(Employees.FirstName, ' ',Employees.LastName)
AND Employees.DateTerminated IS NULL AND Employees.UserName='User1'SELECT
COUNT(*) INTO @n FROM ProbSum;SELECT IF( @n = 0, '', CONCAT( 'You
have', @n, 'Problem Report',
IF(@n=1,'','s'), ': Priorities(High=',
SUM(IF(Priority='High',1,0)), ',Med=',
SUM(IF(Priority='Med',1,0)), ',Low=',
SUM(IF(Priority='Low' ,1,0)), ')' ) )FROM
probsum;DROP TEMPORARY TABLE probsum;All this would be easier in a stored
procedure, if you have MySql 5.PB -----Ed Reed wrote: Can someone help me
simplify this query please? It's meant to return a single string result that
looks something like this, "You have 12 open Problem Reports:
Priorities(High=5, Med=6, Low=1)" The relavent columns from the two tables are
Table: ProblemReportsFields: PRNo, Status, Priority, Responsible Table:
EmployeesFields: Firstname, Lastname, DateTerminated, UserName Here's the query
Select IF((@a:=(SELECT Count(PRNo) From ProblemReports, Employees WHERE
(ProblemReports.Status='Open') AND
(ProblemReports.Responsible=ConCat(Employees.FirstName, '
',Employees.LastName)) AND (Employees.DateTerminated Is Null) AND
(Employees.UserName='User1')))>0, If (@a=1, ConCat('You have one open Problem
Report: Prioritiy = ', (Select Priority From ProblemReports, Employees WHERE
(ProblemReports.Status='Open') AND
(ProblemReports.Responsible=ConCat(Employees.FirstName, '
',Employees.LastName)) AND (Employees.DateTerminated Is Null) AND
(Employees.UserName='User1'))), Concat('You have ', @a, ' open Problem
Reports: Priorities(', (Select ConCat('High=',Count(Priority)) From
ProblemReports, Employees WHERE (ProblemReports.Status='Open') AND
(ProblemReports.Responsible=ConCat(Employees.FirstName, '
',Employees.LastName)) AND (Employees.DateTerminated Is Null) AND
(Employees.UserName='User1') And (Priority='High')),', ',(Select
ConCat('Med=',Count(Priority)) From ProblemReports, Employees WHERE
(ProblemReports.Status='Open') AND
(ProblemReports.Responsible=ConCat(Employees.FirstName, '
',Employees.LastName)) AND (Employees.DateTerminated Is Null) AND
(Employees.UserName='User1') And (Priority='Med')),', ',(Select
ConCat('Low=',Count(Priority)) From ProblemReports, Employees WHERE
(ProblemReports.Status='Open') AND
(ProblemReports.Responsible=ConCat(Employees.FirstName, '
',Employees.LastName)) AND (Employees.DateTerminated Is Null) AND
(Employees.UserName='User1') And (Priority='Low')),')')),''); No virus found
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