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Cross Joins - SQL

This query works and returns 5 columns of data. The last column is the hours worked by an employee for the date (l.DATE_WORK = '2014-11-03') in the query. I want the next four days to be added to the query. That is Tuesday, Wednesday, Thursday, Friday. Would this be done with a join?

SELECT
j.JOBID 'Job',
j.DSCR 'Job Name',
e.EMPID 'Emp ID',
CONCAT(e.EFIRST, ' ', e.EMIDDLE, ' ', e.ELAST) 'Name',
l.HOURS 'Monday'
FROM ccode c
JOIN labor l ON (l.CCODE_ID = c.CCODE_ID)
JOIN job j ON (l.JOB_ID = j.JOB_ID)
JOIN emp e ON (e.EMP_ID = l.EMP_ID)
WHERE l.DATE_WORK = '2014-11-03'
AND l.DELETED = 'N'
GROUP BY e.EMP_ID
ORDER BY j.JobID;

CtrlAltDl

You can select a date range like this:
WHERE l.DATE_WORK >= '2014-11-03' AND I.DATE_WORK <= '2014-11-07'

hdcowboyaz

ASKER

that still returned one Date column.

quizwedge

Just posted the response below over at https://www.experts-exchange.com/questions/28564096/SQL-Cross-joins.html?anchorAnswerId=40448643#a40448643

Cross joins are expensive. You might be better off running separate queries for each day, if your requirements allow.

I don't know if this will improve performance and I didn't test it, but you could try the following. Let me know if you have questions about the query.

SELECT 
j.JOBID 'Job', 
j.DSCR 'Job Name', 
ex.ExtraID 'Extra',
c.CostCode 'Cost Code',
e.EMPID 'Emp ID',
CONCAT(e.EFIRST, ' ', e.EMIDDLE, ' ', e.ELAST) 'Name', 
IsNull(select sum(l.HOURS) from labor l where l.C=CCODE_ID = cCCODE_ID and l.EMP_ID = e.EMP_ID and l.DELETED = 'N' and DATE_WORK = '2014-11-03' group by l.HOURS, 0) 'Monday',
IsNull(select sum(l.HOURS) from labor l where l.C=CCODE_ID = cCCODE_ID and l.EMP_ID = e.EMP_ID and l.DELETED = 'N' and DATE_WORK = '2014-11-04' group by l.HOURS, 0) 'Tuesday',
IsNull(select sum(l.HOURS) from labor l where l.C=CCODE_ID = cCCODE_ID and l.EMP_ID = e.EMP_ID and l.DELETED = 'N' and DATE_WORK = '2014-11-05' group by l.HOURS, 0) 'Wednesday',
IsNull(select sum(l.HOURS) from labor l where l.C=CCODE_ID = cCCODE_ID and l.EMP_ID = e.EMP_ID and l.DELETED = 'N' and DATE_WORK = '2014-11-06' group by l.HOURS, 0) 'Thursday',
IsNull(select sum(l.HOURS) from labor l where l.C=CCODE_ID = cCCODE_ID and l.EMP_ID = e.EMP_ID and l.DELETED = 'N' and DATE_WORK = '2014-11-07' group by l.HOURS, 0) 'Friday'
FROM ccode c
JOIN job j ON (l.JOB_ID = j.JOB_ID)
JOIN emp e ON (e.EMP_ID = l.EMP_ID)
LEFT JOIN extra ex ON (ex.JOB_ID = j.JOB_ID AND ex.EXTRA_ID = c.EXTRA_ID)
GROUP BY e.EMP_ID
ORDER BY j.JobID;

Open in new window

CtrlAltDl

I'm sorry I just realized you are looking to have 5 columns with hours for each 5 working days, is that correct?

You could do a subquery for each day of the week.
SELECT
j.JOBID 'Job',
j.DSCR 'Job Name',
e.EMPID 'Emp ID',
CONCAT(e.EFIRST, ' ', e.EMIDDLE, ' ', e.ELAST) 'Name',
(SELECT I1.HOURS FROM ccode c1 JOIN labor l1 ON (l1.CCODE_ID=c.CCODE_ID) WHERE l1.DATE_WORK = '2014-11-03' AND l1.DELETED = 'N') 'Monday',
(SELECT I2.HOURS FROM ccode c2 JOIN labor l2 ON (l2.CCODE_ID=c.CCODE_ID) WHERE l2.DATE_WORK = '2014-11-04' AND l2.DELETED = 'N') 'Tuesday'
(SELECT I3.HOURS FROM ccode c3 JOIN labor l3 ON (l3.CCODE_ID=c.CCODE_ID) WHERE l3.DATE_WORK = '2014-11-05' AND l3.DELETED = 'N')) 'Wednesday',
(SELECT I4.HOURS FROM ccode c4 JOIN labor l4 ON (l4.CCODE_ID=c.CCODE_ID) WHERE l4.DATE_WORK = '2014-11-06' AND l4.DELETED = 'N')) 'Thursday',
(SELECT I5.HOURS FROM ccode c5 JOIN labor l5 ON (l5.CCODE_ID=c.CCODE_ID) WHERE l5.DATE_WORK = '2014-11-07' AND l5.DELETED = 'N')) 'Friday'
FROM ccode c
JOIN labor l ON (l.CCODE_ID = c.CCODE_ID)
JOIN job j ON (l.JOB_ID = j.JOB_ID)
JOIN emp e ON (e.EMP_ID = l.EMP_ID)
GROUP BY e.EMP_ID
ORDER BY j.JobID;

Without knowing your database schema, you may need to change the joins and/or grouping in the subqueries.

hdcowboyaz

ASKER

Here is the ERD
ERDTheEdgeLaborEntry.jpg

hdcowboyaz

ASKER

Yes, the last five columns will be Hours for each day of the week.

hdcowboyaz

ASKER

1 queries executed, 0 success, 1 errors, 0 warnings

Query: SELECT j.JOBID 'Job', j.DSCR 'Job Name', e.EMPID 'Emp ID', CONCAT(e.EFIRST, ' ', e.EMIDDLE, ' ', e.ELAST) 'Name', (SELECT I1.HOU...

Error Code: 1054
Unknown column 'I1.HOURS' in 'field list'

I don't understand what 'I1.HOURS' represents?

ASKER CERTIFIED SOLUTION

quizwedge

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