Comment définir une clé composite non primaire dans SQL
ALTER TABLE dbo.YourTable
ADD CONSTRAINT UC_YourTable_Col1_Col2
UNIQUE(Col1, Col2)
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ALTER TABLE dbo.YourTable
ADD CONSTRAINT UC_YourTable_Col1_Col2
UNIQUE(Col1, Col2)CREATE TABLE student
(rollNumber INT,
name VARCHAR(30),
class VARCHAR(30),
section VARCHAR(1),
mobile VARCHAR(10),
PRIMARY KEY (rollNumber, mobile));CREATE TABLE student
(rollNumber INT,
name VARCHAR(30),
class VARCHAR(30),
section VARCHAR(1),
mobile VARCHAR(10),
PRIMARY KEY (rollNumber, mobile)); -- This thing