Mysql 创建存储过程SQL

我在数据库中创建了三个表。乘客和航班表已插入信息

create table IT260_AV.dbo.Passenger 
( "Passport ID" nvarchar(20) not null,
"Lastname" nvarchar(50),
"Firstname" nvarchar(50),
"Nationality" int ,
"Telephone" nvarchar(20),
"Email" nvarchar(50),
"Birthdate" datetime,
"NumberOfChildren" int,
"PassportExpDate" datetime)

alter table IT260_AV.dbo.Passenger
add constraint Passenger_PK primary key clustered ("Passport ID")

create table IT260_AV.dbo.Flight
("FlightNo" int not null,
"Air Company" nvarchar (50),
"Departure Date" datetime,
"Departure Time" time,
"MaximumCapacity" int,
"BookingCapacity" int)

alter table IT260_AV.dbo.Flight
add constraint FlightNo_PK primary key clustered ("FlightNo")

create table IT260_AV.dbo.Booking
("Booking Number" nvarchar(20) not null,
"Flight Number" int not null,
"Passenger ID" nvarchar(20),
"SeatNo" int not null IDENTITY(1, 1),
constraint FK_FlightNumber foreign key ("Flight Number") references Flight("FlightNo"), 
constraint FK_PassengerID foreign key ("Passenger ID") references Passenger("Passport ID") )

alter table IT260_AV.dbo.Booking
add constraint BookingNumber_PK primary key clustered ( "Booking Number")

我正在尝试创建一个程序，将乘客的护照和航班号作为输入，并在预订表中创建一个新记录

在完成预订之前，程序应检查航班的最大载客量是否足够。如果不足，则应显示一条消息。此外，它还应根据到期日期检查给定的护照是否有效

有人知道我该怎么做吗

我尝试了此操作，但仍然出现错误：

create procedure sp_Booking_AV @PassengerPassport nvarchar(20), @Flightn0                     int
 as 
 begin
 declare @Capacity int , @SeatAv int , @ExpDate date
set @Capacity = (select MaximumCapacity from Flight where   FlightNo=@Flightn0)
set @SeatAv = (select max(SeatNo) from Booking)
set @ExpDate = (select PassportExpDate from Passenger where "Passport ID" =  @PassengerPassport)

if (@SeatAv is null) set @SeatAv = 0

if(@SeatAv <=@Capacity) 
   if (@ExpDate>=Convert(date,getdate()))
  insert into IT260_AV.dbo.Booking values (@PassengerPassport,@Flightn0)
    else print 'The passport has been expired';

        else  print 'The fly is fool'

      end
        go

---

你试过什么吗？我有点迷路了。我在网上找到了一些例子，但我无法真正理解它是如何工作的。我无法理解如何将insert命令与逐步检查最大容量的功能连接起来。首先检查座位并根据您找到的内容输出是或否。您希望在纯MySQL中完成此操作吗？