Peformance Question

Hi all,
I have some views and I have to create those views using not less then 10 tables. As each column is a lookup column. For each column I have a query Following is an example with one column. Can anybody guide me how I can increase the performance using query as column or joining with the table(s) in from and putting a outer join query.
1. select
(select desc
from lookuptable
where lookupid = b.lookupid) as column1
from main_table b;
2. select a.desc
from lookuptable a, main_table b
where a.lookupid = b.lookupid;
I would like to know which of the case will give better performance.
Thanks in advance
Ghulam Mustafa Butt

If you take as an example a case where the lookup table has very few rows and the main table has relatively many rows, then for the second query the optimizer might choose to use a hash join instead of a nested loop join, if it would be more efficient to do so. In the first query I believe that a nested loop will always be performed.

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                                                                                     512MB DDR333 PC2700 RAM
                                                                                     MSI KT4 Ultra - SR Motherboard with optional S & D Brackets
                                                                                     Liteon 52246S CD-RW (52x24x52)
                                                                                     Samsung 12x DVD-ROM
                                                                                     MSi Nvidia GeForce4 Ti 4200 GFX Card (AGP 4x, 41.09 Drivers)
                                                                                     Seagate Barracuda 40Gb as master on IDE1
                                                                                     Maxtor Diamond Max 7200rpm 60Gb Drive as slave on IDE1
                                                                                     Creative SoundBlaster 5.1 Digital PCI
                                                                                     Creative DTT2200 5.1 Surround Speakers
                                                                                     Enermax CS-305 Black Case with Side window
                                                                                     Windows Xp Proffessional (no SP1)
    A 350w Powerup powersupply (one that comes with the enermax cs-305 case)
    Several Questions:
    Processors/memeory
    I thinking of changing the processor to an athlon xp. With one should i get? And why is that those processors which have the 333FSB are nearly £90 more expensive??? Does matching the fsb speed to your memeory speed increase peformance too?
    Powersupplies
    Is my current powersupply sufficient for my setup?
    Is this PSW any good_ Q-Tec 550w Dual Fan  (that is quite cheap)
    And why is this one much more expensive? Enermax 460w
    Cooling
    using Fuzzy logic 4, the temp displayed is mostly 55-64. Is this too high? And can someone please explian how i find out the full load temps etc.
    GFX Cards.
    I have the 128MB agp 4x MSI GeForce4 ti4200 card running at 250 core/459 clock usign the MSIO clock tab in desktop properties. Can this safely go any higher?
    USB Ports.
    On my M/B i can get the top two ports to work fine, but not the bottom two. How come. I have the bracket installed also with the extra 2 usb ports - does this have something to do with it?
    Thanks in advance.

    1. KT4 Ultra can support upto the fastest XP2700+, you can get it provided you have money... Yes, FSB matching with memory speed the fastest.
    2. Enermax has extra features such as fan-control adjust.
    3. If it's idle, it's high. to get full load, just run some CPU benchmark and loop it.
    4. Your question sounds like "if I buy lottery today will I win?" No comment on the overclockability.
    5. Have you enabled ALL USB PORTs in the BIOS?

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