sql - Car parking reservation availability query with date and time -

-

I am implementing a car parking reservation system in which a user maintains a parking space.

Reservation Table Column -------------- Parking SpaceIID Vehicle IID User Id Starttime and Timeout Endtime

Space table 

  column -------- avialablespaces noOfBookings   < P> User can check the available parking space with the parameter  Start date ,  start time ,  expiration date ,  end time < / code>.  
  If avialablespaces == NoOfBookings  then parking space is not available.  
 To find out if there is a parking space available between startdate, start-up and enddate, end time, what is the logic?   
 
 
 By asking for parking spaces, you can get the number of parking available at a certain time for which booking Time is not present, where at the time your given time starts S or ends.  
 BTW: Why do you split dates and time in your table? The only reason for this is that I can think that there is a possibility of being one without each other, eg. There is no time specified by one day (and no default time is related) If this is the case then you have to consider it in the selection above. If not, then you should change your table design.  
 Edit: Your reservation table has a parking space ID, I think there is a parking space with a record per parking space. Here is a possible statement: It depends on the DBMS how the statement looks like I use the extra work of Oracle here to combine the date and time for easy comparison. It is always a kind of arena that it can work with different date and time zones and if there is one of them - which will be the only sensible reason for division - it is even more complex. You have to adjust the statement accordingly.  
  Select parking spaces where it is not present (select * from * reservation * r.parkingspaceid = s.id and ((additional time (start, startup)> gt; = addtime (R.Startdetter, R. StartTime) and AdTime (: StartDate, Starttime) & AdTime (R.AndDiet, R.AndTime)) or (Adetime (Ended, Endime)> AdTime (R. Start Dat, R. Starttime) and AdTime (: Ended, End-time) & amp; AdTime (R.AndDiet, R & D));

Comments

Post a Comment

Popular posts from this blog

Pass DB Connection parameters to a Kettle a.k.a PDI table Input step dynamically from Excel -

-
Image
I have a requirement whenever I run my own kettle, dynamically took database connection parameters from an excel source Every run should go. I have an Excel column names: hostname, username, database, password. I want to pass these connection parameters to my table input stage dynamically whenever it runs the job. This is what I was trying to do. You can get it Connection parameters from the DB reading source (for example Excel or a CSV file in my example) < / Li> Store the parameters in the variable Using the variable in your connection's settings. Setting Variables Create another conversion for (you can not do it in the same conversion Uses): set variables element variable: The element that reads / writes your data creates a new connection and sets the connection parameter using $ {variable name_} Note that you will need to type in the field field in the field $ {password} Also keep in mind that this can be a security problem as the
Read more

multithreading - PhantomJS-Node in a for Loop -

-
I am trying to implement a screen-scraps application that opens a URL in which a parameter changes as it is for a loop: var data = [ '100', '101', '102', '103', '104']; (Var indexA = 0; indexA & lt; data.length; indexA ++) for {Phantom Generation ({'port': freeport}, function (pH) {ph.create page (function (page) {page.open ("http: //...++ data [index B] +" ... " , Status {console.log ("open site:" + data [index B], position); / * OLD * / indexB ++; page evaluation (function () {// page scrape and an object Return}, function {console.log (result.dataRequest); // here is the problem}); / * new and fixed * / indexB ++} first console Logs it: Open Site: 100 Success Opens Site: 101 Success B Ola Site: 102 Success Opening Site: 103 Success Opened Site: 104 Success Which is good. Data is verified in scrap HTML and from index to array Matches. So in page 101 I scrap '101 and retrieve' and pu
Read more

c++ - MATLAB .m file to .mex file using Matlab Compiler -

-
I know that it can speak as a very famous topic, but something that helps me with it Not found This scenario is: I have my functions function, no matter what's inside, it's a generic function that may depend on other toolboxes. Does. Has input and output; I want to generate the same myFun.mex function; : Lib myFun This way I get some new files: libmyfun.c libmyfun.dll Libmyfun.exp libmyfun.exports libmyfun .h libmyfun.lib Reading around and I think that Creating a myfun.cpp that is very famous is included: / * gateway function * / zero max function (ent NLHS, MXARRA * PLS [], int NRHS, CONST M Xeray * PHS []) Here is the Variable Deals * / / * code here * /} I have tried to do this and are called Regular of Max Generation: Max ('- v', 'myfun.cpp') But I get many errors, and I should say that my myfun.cpp copy / Paste Function is where I have a lot of doubts ... especially on input / output management. My q
Read more