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I have mysql database table for addresses, it contains separate columns for post code / street /town.
How can I make sure a full table entry is unique rather than just one of the columns alone?
mysql allows you to have a unique key for n number of fields or columns. When you declare this column as unique , mysql checks for the constraint for duplication.
For more info read this mysql unique key
“The UNIQUE and PRIMARY KEY constraints both provide a guarantee for uniqueness for a column or set of columns.”
But, i suggest the front end validation for making the user comfortable (just incase u had not thought of it 😉 )