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Trigger Happy DB

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Trigger Happy DB MS SQL Development forum discussing administration, MS SQL queries, and other MS SQL-related topics. SQL Server is Microsoft's enterprise database engine.

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  #1  
Old November 22nd, 2003, 03:48 PM
markb_1984 markb_1984 is offline
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Problem Implementing Relational Trigger
I'm having difficulty implementing a trigger in which I am trying to make sure that no trainee is registered as being present for a class at the same time as another class already registered for, in other words no trainee can be in more than 1 place simultaneously.

The tables which the trigger is based around are:

class(classno, time,...)
register(traineeno, classno)


Any ideas on what query I need to perform to get the correct behaviour?
Last edited by markb_1984 : November 24th, 2003 at 02:59 AM.
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Old November 24th, 2003, 02:59 PM
tatero tatero is offline
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could you create a UNIQUE constraint on [traineeno] AND [time] ?
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Old November 25th, 2003, 06:55 AM
markb_1984 markb_1984 is offline
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Sorted it out using an IF EXISTS and linking class and register on classno and inserted and class on traineeno.
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