Search the forum,

having

A HAVING clause in SQL specifies that an SQL SELECT statement must only return rows where aggregate values meet the specified conditions.
HAVING and WHERE are often confused by beginners, but they serve different purposes. WHERE is taken into account at an earlier stage of a query execution, filtering the rows read from the tables. If a query contains GROUP BY, rows from the tables are grouped and aggregated. After the aggregating operation, HAVING is applied, filtering out the rows that don't match the specified conditions. Therefore, WHERE applies to data read from tables, and HAVING should only apply to aggregated data, which isn't known in the initial stage of a query.
To view the present condition formed by the GROUP BY clause, the HAVING clause is used.

View More On Wikipedia.org
Recent contents Top users
  1. J

    Help, 29 Year old Female looking to train to become a plumber.

    Well as the title suggests i'm looking to train to become a plumber in the Nottingham area. Having done various other jobs i have now decided to have a complete career change and would welcome any advice anyone would be able to offer me. Having trudged through the internet i am still no...
  2. B

    Best OFTEC FGA kit

    Having had my old Kane 455 stolen recently, I need to replace my GGA with something shiny and new. I only had the natural gas kit with my old meter but, having added OFTEC, I need the full compliment of test equipment for that too. I've seen plenty of kits that seem to be heavily biased towards...
  3. T

    Waste Accumulating After Flushing

    Hello, I was wondering if someone could please give me some advice? I live in a rented property and previously had a toilet with a very weak flush, so we got the landlord to replace it as after going for a #2 we were having to flush around 8 times just to clear it. Since then we have had a...
  4. C

    Worcester Greenstar 37CDi Combi Boiler - air lock in primary circuit?

    Hi I am new to this forum. I am having difficulty with my boiler (details above). It makes a loud buzzing noise that builds in intensity before suddenly stopping. It appears to be random in occurrence and having been next to the machine when it did this the noise appears to be coming from within...
    • CRHF
    • Thread
    • air air lock appears boiler circuit combi combi boiler greenstar having might noise oil primary worcester
    • Replies: 3
    • Forum: Plumbing Jobs | The Job-board
  5. P

    having problems removing rads with ancient valves

    Hi, So have just bought a house and trying to remove rads so I can remove wallpaper. Looked online and tried the turning valves clockwise on the rad, this didn't work so turned off valve next to hot water tank. and took off the first rad which had valves at either end. However I am having...
  6. M

    Anyone else having weird problems placing orders on Williams' site?

    Got a strange thing going on - can put stuff into my basket, go through the whole checkout process, billing address, delivery address, payment method, the whole lot works. As soon as I click the final "Submit order", it goes back to my basket, without taking the order. And just goes round and...
  7. Riley

    Having a moment...

    Full of cold and head is not functioning. Whats the minimum fall on 2in waste pipe??
  8. rpm

    24hrs notice before having sex

    Just seen a news item ........ Man ordered to give the police 24hrs notice before having sex or planning too or he faces 5yrs inside! They would be lucky to get 24 minutes notice from me.
  9. M

    Having to run the boiler at high setting 6

    I have a heat only 's' plan system with a Bosch Worcester greenstar 24i on a twin coil Oso solarcyl 200 lt. The boiler has to run at max to heat the water but this means the rads are too hot and I would like to lower the boiler stat. I realise the hot water temperature will only obtain the the...
  10. SimonG

    What Time You Having Off At Christmas?

    As the title says. I'm finishing at lunchtime on the 23rd until Monday 4th and only working Tuesday 29th in between. Would have worked the 30th as well but there's a party on the Tuesday night :)
  11. M

    Lino under dishwasher

    If installing a dishwasher in the kitchen by removing a draw unit. Is it essential there is lino under the dishwasher? Will be on a chipboard full.
  12. S

    Tightening back nut

    I've fitted a new mixer tap to the bathroom wash basin. I was maybe a bit too gentle tightening the back nut and now having plumbed it all, I find the mixer can turn. Didn't want to take apart again, so bought an adjustable basin wrench. whilst it reaches, because of the moulded recess...
  13. U

    Under the kitchen sink HELP!

    So I have an ikea sink set up which has been fine for months. Recently the water hasn't been draining away very quickly and actually, due to having a double sink, will fill both sinks when emptying water into one. I took the waste pipe off to see if I could see an immediate blockage. Nothing. I...
    • Unregistered
    • Thread
    • having help kitchen kitchen sink nothing sink under water where
    • Replies: 2
    • Forum: Plumbing Jobs | The Job-board
  14. M

    Having a career as a plumber without NVQ level 3

    Hey are there many plumbers on here that are just qualified to NVQ level 2? Can you manage with just this qualification without doing level 3.
  15. R

    Help needed in sizing a Radiator

    Please could I ask for someone to help me with sizing a rad for my living room. I have tried about 7 online sites so far, and have results ranging from 4379 to 6918 BTU's, which I find confusing as the same details are entered for each. To give a bit of detail, I live in a bungalow that was...
    • RussellMrgn
    • Thread
    • floor having help help needed length needed radiator single sizing tails
    • Replies: 14
    • Forum: Plumbing Jobs | The Job-board
  16. Worcester

    Will there be any RHI next year?

    DECC proposing to cut solar feed-in tariff rates by 87% DECC proposing to cut solar feed-in tariff rates by 87% | Solar Power Portal With this level of cut for the FiT, I'm not holding my breath for any ongoing allocation, beyond the current budget commitment to March 2016 for the RHI...
  17. jonnyswamp

    I'm having a day off

    Well most of it anyway, left the apprentice ripping out a bathroom suite just up the road and hacking off the tiles What could possibly go wrong???? It's a beautiful day to go down to the boat and take in the sea air Then wait for the frantic phone call from a woman screaming...
  18. G

    There are a few thieves having a really really bad day today!

    So through the grape vine and social media, it turns out someone I know had thier van, car and motorbike stolen last night. If only they'd done a bit of research as the bloke who's stuff it was is the brother of the county's former biggest drug dealer. I know nothing more then there is...
  19. F

    British Gas - The fastest service engineers in the world?

    Seeing as I am not Gas Safe I just had British Gas come and service my boiler/central heating system. 10-15 minutes later he has signed the paperwork and is flying down the road? Correct me if I'm wrong but surely it should take a lot longer than that?
  20. D

    External drain/soil pipes

    Hi All, I am currently undergoing some renovations at my place. My builder is installing an ensuite to the rear of our building where the kitchen and main bathroom is located. The pipes are at the same location. Looking at the picture my builder is planning on the soil and drain pipes...
Creating content since 2001. Untold Media.

Newest Plumbing Threads

Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock