How can MySQL constraints be adjusted to prevent duplicate entries in a database?

To prevent duplicate entries in a MySQL database, you can use a unique constraint on the column(s) that should not have duplicate values. This constraint ensures that each value in the specified column(s) is unique, thus preventing duplicates from being inserted. 

CREATE TABLE table_name (
    column1 INT NOT NULL,
    column2 VARCHAR(50) NOT NULL,
    UNIQUE KEY unique_constraint_name (column1, column2)
);

Keywords

MySQL constraints duplicate entries database adjustment

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