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MySQL Edit Syntax

Posted on 2014-01-09
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Last Modified: 2014-01-09
I have a table called 'charges'

I want to update the value of field 'calculated_weight' based on the contents of 'department_id', which will determine what to multiply against 'quantity' to determine the update value for 'calculated_weight'.  Example:

UPDATE `charges` SET `calculated_weight` = IF(`department_id` IS 4120, 1, 2);

Now, that isn't want I want, but puts into logical form the paragraph above it *almost.  

What I really want is to insert (quantity*.0857) into `calculated_weight` when `department_id` == 4120.
IF
'department_id' == 4250, then i would want (quantity*1.0147) to insert into 'calculated_weight'

I have about 6 departmentIDs to monitor and adjust the mutlplication value for.  

I tried a few options in MySQL, but it isn't working out for me.  

Thanks
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Question by:weklica
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Assisted Solution

by:Gary
Gary earned 200 total points
ID: 39769004
Why not this for each department and repeat just adjusting the calculation

UPDATE `charges` SET `calculated_weight` = (quantity*.0857) where department_id=4120

edited
For multiple departments then just an OR

UPDATE `charges` SET `calculated_weight` = (quantity*.0857) where department_id=4120 OR department_id=4121 OR department_id=4122
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Accepted Solution

by:
Ashok earned 300 total points
ID: 39769007
Try

UPDATE `charges` SET
`calculated_weight` =
CASE `department_id` WHEN 4120 THEN quantity*.0857
WHEN `department_id` WHEN 4250 THEN quantity*1.0147
....
ELSE 'Charges' END
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Expert Comment

by:Norie
ID: 39769008
Have you tried using CASE..WHEN?

UPDATE `charges`
SET `calculated_weight` =
  CASE
     WHEN `department_id`= 4120 THEN quantity*0.0857
     WHEN `deparment_id` = 4250 THEN quantity*1.0147
      -- etc
  END
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Author Comment

by:weklica
ID: 39769010
That works perfectly.  I thought I tried something like that, but clearly missed something.  I used this specifically and it worked:

UPDATE  `charges` SET  `calculated_weight` = (  `quantity` * .0857 ) WHERE  `department_id` =4120
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Author Comment

by:weklica
ID: 39769018
I just noticed the CASE when option and will ultimately go wtih that one.  Very much appreciated.  You guys are awesome.
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Expert Comment

by:Gary
ID: 39769019
I did a small edit for doing multiple departments.
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Expert Comment

by:Norie
ID: 39769026
cathal

If you have multiple deparments why not use an IN clause.

`deparment_id` IN (4120, 4121, 4122)
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Expert Comment

by:Ashok
ID: 39769035
I have about 6 departmentIDs to monitor and adjust the mutlplication value for.  

If you are going to update all 6 departments (the whole table), you do not need

where `deparment_id` IN (4120, 4121, 4122)
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Expert Comment

by:Gary
ID: 39769045
Cos I was having a dumb blonde moment.
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