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Author AutoTrader - Looks like a cool place to work!
Ian
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Registered: 28th Aug 99
Location: Liverpool
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6th Apr 17 at 13:05   View Garage View User's Profile U2U Member Reply With Quote

quote:
Originally posted by DaveyLC
specific manufacturer optional items as that would just be barmy for something like Autotrader!


They'd need to start with that because part of the problem is sellers wouldn't list stuff at that level of detail.

Also not that barmy when you consider what the buyer will be searching for - many know what they want.


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DaveyLC
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6th Apr 17 at 13:43   View User's Profile U2U Member Reply With Quote

BTW you mentioned storage.. BIT shifting over using BOOLEAN is far more efficient because of one main reason.. The smallest field size in SQL/MSQL is 1 BYTE even a BOOLEAN/BIT flag uses 1 BYTE so within that 1 BYTE you could actually store a combination of store 8 options rather than 1.

16 Options as BOOLEAN fields would occupy 16 bytes of raw storage where as using BIT shifting those same 16 bytes could store a combination of 128 options.
Ian
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6th Apr 17 at 14:08   View Garage View User's Profile U2U Member Reply With Quote

Yeah assuming you could get the data to not waste bits once you stored it.


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DaveyLC
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6th Apr 17 at 14:21   View User's Profile U2U Member Reply With Quote

You either use a dynamic VARBINARY(MAX) container or make sure the field type is the right size for the largest combination, worst case scenario is you waste 7 bits
DaveyLC
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6th Apr 17 at 14:24   View User's Profile U2U Member Reply With Quote

... To be fair a BIGINT is 8bytes which would give 64 options that would be great for something like Autotrader that is listing generic things like:

Metalic Paint
Electric Seats
SatNAv

etc.
etc.
Ian
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6th Apr 17 at 17:50   View Garage View User's Profile U2U Member Reply With Quote

Yeah although I wasn't looking to process the manufacturer data in any way, just store it. So their keys in the DB would drop straight in to the sales data. Really all you're doing is marrying up the sales list with existing data rather than trying to describe the sales cars more exhaustively.


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kz
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7th Apr 17 at 22:01   View User's Profile U2U Member Reply With Quote

Fuck this thread turning boring.

Best search parameter of AutoTrader is 'model variant' it's so helpful.

I also like search by acceleration but it's a shame there's only a choice of 4 different ones and not whatever you want.
Graham88
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9th Apr 17 at 00:49   View User's Profile U2U Member Reply With Quote

I'm not surprised they can afford lovely offices when they charge the price that they do!

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