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Duplicate Entries

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Duplicate Entries MySQL Help forum discussing administration, SQL syntax, and other MySQL-related topics. MySQL is an open-source relational database management system (RDBMS).

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  #1  
Old June 19th, 2000, 08:37 AM
simpson simpson is offline
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Any easy way to check for duplicates?

Or do I have to do this in a crappy way
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  #2  
Old June 19th, 2000, 11:27 AM
rycamor rycamor is offline
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For any field in a MySQL table, you have 3 options for field constraints:

PRIMARY, INDEX, and UNIQUE

In your case, just use the UNIQUE constraint and MySQL will generate a standard error if you try to insert a duplicate record. If you want, from there you can handle it with your server-side programming to generate the appropriate 'retry' message.
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  #3  
Old June 20th, 2000, 09:05 AM
simpson simpson is offline
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so say I have a database of people

I go to enter in John Smith for the second time....there will be an error and I could make it do something?

I'll read up on it on mysql.com i guess
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  #4  
Old June 21st, 2000, 11:13 PM
rycamor rycamor is offline
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What server-side programming language are you using?
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  #5  
Old July 8th, 2000, 11:18 AM
herrhu herrhu is offline
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Since I have an interest in this thread, I will answer in my case.

I am using PHP 4.01 -- how would this be done?

Rod
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