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By: a guest on May 7th, 2012  |  syntax: None  |  size: 0.28 KB  |  hits: 14  |  expires: Never
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  1. Trigger to prevent inserting 2 same values in one table
  2. CREATE TABLE Concert
  3. (  
  4.  ... (filled in with your existing table definition)
  5.  CONSTRAINT concert_place_unique UNIQUE (id_place, date)
  6. );
  7.        
  8. ALTER TABLE Concert
  9. add CONSTRAINT concert_place_unique UNIQUE (id_place, date);
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