ReQL command: min

Command syntax

sequence.min(field | function) → element
sequence.min({index: <indexname>}) → element
r.min(sequence, field | function) → element
r.min(sequence, {index: <indexname>}) → element

Description

Finds the minimum element of a sequence.

The min command can be called with:

• a field name, to return the element of the sequence with the smallest value in that field;
• an index (the primary key or a secondary index), to return the element of the sequence with the smallest value in that index;
• a function, to apply the function to every element within the sequence and return the element which returns the smallest value from the function, ignoring any elements where the function produces a non-existence error.

For more information on RethinkDB’s sorting order, read the section in ReQL data types.

Calling min on an empty sequence will throw a non-existence error; this can be handled using the default command.

Example: Return the minimum value in the list [3, 5, 7].

r.expr([3, 5, 7]).min().run(conn, callback);

Example: Return the user who has scored the fewest points.

r.table('users').min('points').run(conn, callback);

Example: The same as above, but using a secondary index on the points field.

r.table('users').min({index: 'points'}).run(conn, callback);

Example: Return the user who has scored the fewest points, adding in bonus points from a separate field using a function.

r.table('users').min(function(user) {
    return user('points').add(user('bonusPoints'));
}).run(conn, callback);

Example: Return the smallest number of points any user has ever scored. This returns the value of that points field, not a document.

r.table('users').min('points')('points').run(conn, callback);

Example: Return the user who has scored the fewest points, but add a default null return value to prevent an error if no user has ever scored points.

r.table('users').min('points').default(null).run(conn, callback);

Related commands

• map
• reduce
• count
• sum
• avg
• max
• group

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