Create a Tabular object with three columns:

Set one of them to be a key column, to allow indexing by that column:

Extract the row containing "b" in the key column:

Alternatively, use RowKey[…] as a function:

Create a Tabular object with a key column:

Extract the row containing "a" in the key column:

The List wrapper is not needed when there is a single key column:

Use RowKey[…] as a function acting on a Tabular object:

Take a Tabular object of populations of the G7 countries:

Set two columns as key columns:

Use RowKey to extract a value for a given column:

Take tabular data of fatal collisions for each state:

There are no key columns specified:

Reorder the columns and set the "state" column as key column:

Extract the rows for US Midwest states:

Take a Tabular object with a key column:

Row extraction can be performed with RowKey:

Key wrappers can also be used to extract a tabular row:

Keys of a Tabular object returns a list of RowKey expressions if key columns are specified:

For multiple key columns:

RowKey[{key₁,key₂,…}] allows indexing rows by the values of multiple key columns:

ExtendedKey[key₁,key₂,…] allows specifying columns by multiple values:

RowKey can contain keys corresponding to columns specified by ExtendedKey objects: