sql server - Trigger in SQL to count a column and give a error if it is more than a specific value -

-

I need a trigger to avoid putting a specific value for the column, for example, in the booking table I have Booking is an ID and invoice id I want to count the booking ID for each invoice and compare the numbers in the airline table, which is called MaxBooking. If the number was higher than MaxBooking, it means that I can not book with that invoice number now 

  | Booking id | Invoice id Traveler iid Flight ID | | | 1 | 101 | 20 | 99 | | 1 | 101 | 20 | 99 | | 1 | 101 | 20 | 99 | | 1 | 101 | 20 | 99 | | Flight Id | Airline id | | 99 | 500 | Airline ID | Airline-name | MaxBooking | | 500 Birtish Airway | 4 |    
 
 
 This is the right solution, you are searching for  
 I have accepted the names of the table: 
 1. dbo.fllightbookings 
 2.dbo.Flights 
 3.dbo.Airlines 
 According to their appearance in their question  
  Create Triggers [DBO]. [Trg_restrictMaxBooking] ON [dbo]. [Flightbearing] Start as the starting of INSERT; BEGIN transfer notification @ flight iid is selected @fliteaid = iFlightId I is included with IF ((SELECT COUNT (*) to dbo.FlightBookings where flight id = @ flight ID) & lt; ISNULL ((SELECT MAXBOING FROM) Dbo.Airlines WHERE AirlineId = (SELECT AirLineId FROM dbo.Flights WHERE FlightId = @ FlightId)), 0)) Rollback Transaction Rezer ('Failed', 16,1) Go Back Command Transmission Go After   
 Do you need any further help or I'm missing something, please tell me.

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