What are the features of a primary key?, Write MySql command to open an existing database., Command to add new row to a table, Operator which is used to select from a list of values, Command to show tables in a current database, Command to view the structure of the table, Keyword to display only unique values from a column, What is DDL and DML?, Can a table have multiple primary keys? Can it have multiple foreign keys?, Write one similarity and one difference between CHAR and VARCHAR data types.

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