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The column with PRIMARY KEY setting is often an ID number, and is often used with AUTO_INCREMENTĮach table should have a primary key column (in this case: the "id" column). PRIMARY KEY - Used to uniquely identify the rows in a table.AUTO INCREMENT - MySQL automatically increases the value of the field by 1 each time a new record is added.UNSIGNED - Used for number types, limits the stored data to positive numbers and zero.DEFAULT value - Set a default value that is added when no other value is passed.NOT NULL - Each row must contain a value for that column, null values are not allowed.Reference of all the available data types, go to ourĪfter the data type, you can specify other optional attributes for each The data type specifies what type of data the column can hold.
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