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**To update an item in a table**
The following ``update-table`` example updates an item in the ``MusicCollection`` table. It adds a new attribute (``Year``) and modifies the ``AlbumTitle`` attribute. All of the attributes in the item, as they appear after the update, are returned in the response. ::
aws dynamodb update-item \
--table-name MusicCollection \
--key file://key.json \
--update-expression "SET #Y = :y, #AT = :t" \
--expression-attribute-names file://expression-attribute-names.json \
--expression-attribute-values file://expression-attribute-values.json \
--return-values ALL_NEW
Contents of ``key.json``::
{
"Artist": {"S": "Acme Band"},
"SongTitle": {"S": "Happy Day"}
}
Contents of ``expression-attribute-names.json``::
{
"#Y":"Year", "#AT":"AlbumTitle"
}
Contents of ``expression-attribute-values.json``::
{
":y":{"N": "2015"},
":t":{"S": "Louder Than Ever"}
}
Output::
{
"Item": {
"AlbumTitle": {
"S": "Louder Than Ever"
},
"SongTitle": {
"S": "Happy Day"
},
"Artist": {
"S": "Acme Band"
},
"Year": {
"N" : "2015"
}
}
}
For more information, see `Writing an Item <https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/WorkingWithItems.html#WorkingWithItems.WritingData>`__ in the *Amazon DynamoDB Developer Guide*.
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