antonms
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Table Contraints
Hi
Is it possible to apply a constraint or equivalent to a table that prevents a record being inserted when the record to be inserted already exists but the values are swapped around?
For example, if a table had two columns: FirstName and SecondName having a record FirstName = ‘John’ and SecondName = ‘Smith’ – then when another record having FirstName =’ Smith’ and SecondName =’ John’ was about to be inserted SQL would reject it.
Good luck!
Is it possible to apply a constraint or equivalent to a table that prevents a record being inserted when the record to be inserted already exists but the values are swapped around?
For example, if a table had two columns: FirstName and SecondName having a record FirstName = ‘John’ and SecondName = ‘Smith’ – then when another record having FirstName =’ Smith’ and SecondName =’ John’ was about to be inserted SQL would reject it.
Good luck!
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Scott Pletcher
If you want to avoid a trigger, you could also create a PERSISTED column with a unique index on it. I can give you details on that if you'd like them.
ASKER
If possible I would prefer not to use a trigger - more info on the persisted column option would be great thanks.
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ASKER
Thanks
Microsoft SQL Server
Microsoft SQL Server is a suite of relational database management system (RDBMS) products providing multi-user database access functionality.SQL Server is available in multiple versions, typically identified by release year, and versions are subdivided into editions to distinguish between product functionality. Component services include integration (SSIS), reporting (SSRS), analysis (SSAS), data quality, master data, T-SQL and performance tuning.
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