Set column 

Write multiple values into a set column.

Write multiple values into a set column. If a table specifies a set to hold data, then use INSERT or UPDATE to enter data.

Procedure

  • Insert data into the set, enclosing values in curly brackets.
    Set values must be unique, because no order is defined in a set internally.
    cqlsh>INSERT INTO cycling.cyclist_career_teams (id,lastname,teams) 
      VALUES (5b6962dd-3f90-4c93-8f61-eabfa4a803e2, 'VOS', 
      { 'Rabobank-Liv Woman Cycling Team','Rabobank-Liv Giant','Rabobank Women Team','Nederland bloeit' } );
  • Add an element to a set using the UPDATE command and the addition (+) operator.
    UPDATE cycling.cyclist_career_teams 
      SET teams = teams + {'Team DSB - Ballast Nedam'} WHERE id = 5b6962dd-3f90-4c93-8f61-eabfa4a803e2;
  • Remove an element from a set using the subtraction (-) operator.
    UPDATE cycling.cyclist_career_teams
      SET teams = teams - {'WOMBATS - Womens Mountain Bike & Tea Society'} WHERE id = 5b6962dd-3f90-4c93-8f61-eabfa4a803e2;
  • Remove all elements from a set by using the UPDATE or DELETE statement.

    A set, list, or map needs to have at least one element because an empty set, list, or map is stored as a null set.

    UPDATE cyclist.cyclist_career_teams SET teams = {} WHERE id = 5b6962dd-3f90-4c93-8f61-eabfa4a803e2;
    
    DELETE teams FROM cycling.cyclist_career_teams WHERE id = 5b6962dd-3f90-4c93-8f61-eabfa4a803e2;

    A query for the teams returns null.

     SELECT id, teams FROM users WHERE id = 5b6962dd-3f90-4c93-8f61-eabfa4a803e2;