Rename two columns of a Tabular object:

Alternatively, use indices to specify which columns to rename:

Rename the first two columns of a Tabular object:

Rename two columns of a Tabular object using operator form:

Take a Tabular object:

Rename some of its columns by using rules oldkeynewkey:

Alternatively, use indices on the left-hand side of the rules:

Use a mixture of notations:

Take a Tabular object without column keys:

Add respective column keys, using "ColumnN" for the column if not specified:

Use RenameColumns[tab,None] to remove all column keys from a Tabular object:

Take a Tabular object with integer keys:

RenameColumns interprets the left-hand sides of the rules as Part specifications:

Use Key to look up an integer key:

Take a Tabular object with ExtendedKey column keys:

Rename a single inner key:

Renaming a single outer key may change the spanning:

Rename a spanning key:

Rename columns to eliminate ExtendedKey:

Rename the component keys of a TimeSeries object with multiple components:

A simple TimeSeries object has two components with names "Timestamp" and "Value":

The values are stored as a TabularColumn object:

Rename the "Value" component:

The new time series is not simple anymore, and its values are stored as a Tabular object:

Take an EventSeries object wit a named component:

The "Timestamp" component of a time or event series cannot be renamed while keeping its role:

Take data for monthly ozone readings in Los Angeles:

Rename the months to Roman numerals:

Take data for monthly ozone readings in Los Angeles:

Rename columns to introduce division of months to quarters:

Take data containing information about new mothers:

Create a pivot table counting how many new mothers smoked, depending on if they used or did not use alcohol, for each mother age group:

The column keys of the pivot table were created automatically, based on the values from the "alcohol" column, and can be renamed to be more informative:

Renaming rules that do not correspond to any existing column are ignored:

With repeated renamings of the same column key, only the last one is used:

New names and old names can overlap, effectively implementing a permutation of column names:

A permutation of the columns themselves can be implemented with Part:

Tabular[tab,newcols] is equivalent to using RenameColumns to rename all column keys:

Take a Tabular object:

Each rule is interpreted here as a column renaming, not as a new column name:

Use another rule to have rules as column keys:

However, using rules in keys requires a more complicated Slot construction, so it is not recommended: