Denormalising CSV tables

Keith Clarke keith.clarke at me.com
Sun Mar 15 11:20:45 EDT 2015


Sadly, I have no control over the source CSVs - they are from a backup zip file. 

I’m trying to denormalise the key data down to the most detailed level in LiveCode to simplify a single import into Excel - to enable pivot table reporting without having to reconstruct the relationships in Excel using Vlookups.
Best,
Keith..
 
> On 15 Mar 2015, at 15:14, Peter Haworth <pete at lcsql.com> wrote:
> 
> Are you creating the csv file yourself? If so, it should be easy to use a
> Select statement with JOINs to make one row for each group of related
> entries from the four tables.
> 
> On Sun, Mar 15, 2015, 6:59 AM Keith Clarke <keith.clarke at me.com> wrote:
> 
>> Thanks for the steer, Mike. I’ve not really used arrays before, but this
>> sounds a more efficient approach - so I’ll wok through the lessons & docs.
>> Best,
>> Keith..
>> 
>>> On 15 Mar 2015, at 13:21, Mike Doub <mikedoub at gmail.com> wrote:
>>> 
>>> Basically createa direct access to all the child tables.
>>> 
>>> On Sunday, March 15, 2015, Mike Doub <mikedoub at gmail.com> wrote:
>>> 
>>>> Would it not be better to make the child table into an array indexed by
>>>> its ID, then make a single pass thru the parent table using the child ID
>>>> into the array.
>>>> 
>>>> Mike
>>>> 
>>>> On Sunday, March 15, 2015, Keith Clarke <keith.clarke at me.com
>>>> <javascript:_e(%7B%7D,'cvml','keith.clarke at me.com');>> wrote:
>>>> 
>>>>> Folks,
>>>>> Is there a ‘smart’ way to denormalise ‘child' & ‘parent' CSV tables
>>>>> extracted from an RDBMS in LiveCode or is it down to iterating through
>>>>> lists using chunk functions?
>>>>> 
>>>>> I have four tables, related in the database as
>>>>> Child-Parent-GrandParent-GreatGrandParent. Each file has its own
>> record ID
>>>>> & the ID of its direct parent. I need to create a ‘DenormalisedChild'
>> file
>>>>> with GrandParent & GreatGrandParent IDs appended to each row.
>>>>> 
>>>>> I’m currently assuming the only way forward is to build a
>>>>> tDenormalisedChild variable by repeated iteration at each ‘level’:
>>>>> Iterating through lines of the Child file to compare its ChildParentId
>>>>> with each row in the the Parent file, until ParentRowId =
>> ChildParentId;
>>>>> Repeat (1) on Parent file rows to find ParentGrandParent values;
>>>>> Repeat (1) on GrandParent file rows to get GreatGrandParent values
>>>>> 
>>>>> Is their a more efficient approach?
>>>>> Best,
>>>>> Keith..
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