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Editorial Team
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Asked: 2026-05-26T07:40:02+00:00

I have a table with a primary key composed of three columns: CODE_TARIF, UNITE,

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I have a table with a primary key composed of three columns: CODE_TARIF, UNITE, MODE_LIV. In my table there are three records with MODE_LIV = 2. Then I insert a record with MODE_LIV = 4.

INSERT INTO T_TARIF (
    CODE_TARIF, ZONE, UNITE, MODE_LIV, LIBELLE, TR_DEBUT, TR_FIN, MONTANT
) 
SELECT 'Livr_A_50_99', '2', '1', '4', 'sdg', '50', '99', '90' 
UNION ALL 
SELECT 'Livr_A_50_99', '2', '1', '4', 'sdg', '50', '99', '90' 
UNION ALL 
SELECT 'Livr_A_50_99', '2', '1', '4', 'sdg', '50', '99', '90'

It returns an error (violation of primary key), which doesn’t make any sense because MODE_LIV = 2 is not equal to MODE_LIV = 4.

I know I could add a surrogate key as an auto-incrementing identity column, but in my situation that isn’t an option.

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1 Answer

  1. Editorial Team

    You are inserting 3 rows with identical data in the primary key fields.
    Of course you’re going to get PK violations.

    Change the code to:

    INSERT INTO T_TARIF (CODE_TARIF, ZONE, UNITE, MODE_LIV, LIBELLE, TR_DEBUT, TR_FIN, MONTANT) 
SELECT 'Livr_A_50_99', '2', '1', '3', 'sdg', '50', '99', '90' 
UNION ALL 
SELECT 'Livr_A_50_99', '2', '1', '4', 'sdg', '50', '99', '90' 
UNION ALL 
SELECT 'Livr_A_50_99', '2', '1', '5', 'sdg', '50', '99', '90'

//Different data for every row    ^
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