Question

I have a table that looks like this:

Quote     Super      Factor
29        63                   [83.79]
38        61                   [81.13]
79        65                   [86.45]

47        40                   [80]
81        25                   [50]
82        35                   [70]

I want to take the column ‘Super’ and multiply it by 1.33 IF the ‘Quote’ is 29, 38, 79. If the field ‘Quote’ is 47, 81, 82 then multiply ‘Super’ by 2.

Quote is “BigInt(10)” and both ‘Super’ and ‘Factor’ have a type of “Double”. The name of the table is “Quote_IDX”.

Note: The numbers in ‘[]’ are what I should end up with once this calculation is done. As you can probably tell I’m fairly new to MySQL so I need some help.

Thanks in advance.

Answer 1

You can use the following which uses a CASE statement. The SELECT will show you the data results:

select quote, super, 
  case when quote in (29, 38, 79)
        then super * 1.33
      when quote  in (47, 81, 82)
        then super * 2.0
      else 0
  end factor
from Quote_IDX

See SQL Fiddle with demo. Then if you want to do an UPDATE of the factor column:

update Quote_IDX
set factor = (case when quote in (29, 38, 79)
                then super * 1.33
              when quote  in (47, 81, 82)
                then super * 2.0
              else 0 end)

See SQL Fiddle with Demo