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Command 'Update' is used to update the data in the Cassandra table. Cassandra does upsert. Together, they will define your row primary key. In Cassandra 3.0 and earlier, you can only insert values smaller than 64 kB into a clustering column. Updating Data in a Table. Upsert means that Cassandra will insert a row if a primary key does not exist already otherwise if primary key already exists, it will update that row. ... UPDATE cannot update the values of a row's primary key fields. In Cassandra, two types of columns have a special role: the partition key columns and the clustering columns. In this table I store the product name and seller name (there may be thousands of sellers) and score (Product score of the seller) so as following. 1. Each row is referenced by a primary key, also called the row key. CREATE TABLE products ( product_name varchar, seller_name varchar, score int, primary key (product_name, seller_name) ); ... use the UPDATE command. In Cassandra, a table can have a number of rows. CREATE TABLE IF NOT EXISTS comments_by_video ( videoid uuid, commentid timeuuid, userid uuid, comment text, PRIMARY KEY ((videoid), commentid) ) WITH CLUSTERING ORDER BY (commentid DESC); So looking at PRIMARY KEY ((videoid), commentid) both videoid and commentid are used to create a unique row. ... UPDATE cannot update the values of a row's primary key fields. I have a table for my products in Cassandra. Primary key columns. All primary key columns and their values must be specified in the WHERE clause to identify a row. UPDATE is the command used to update data in a table. A PRIMARY KEY consists of a the partition key followed by the clustering columns. So, let's make our page_name column as a composite primary key with the page_id . The uuid() function is suitable for use in insert or update statements and uuid() function takes no parameter value to generate a unique random Type 4 UUID value which is guaranteed unique value. To update a counter in a counter table, specify the increment or decrement to the counter column. Update Data. The following keywords are used while updating data in a table − Where − This clause is used to select the row to be updated.. Set − Set the value using this keyword.. Must − Includes all the columns composing the primary key.. While updating rows, if a given row is unavailable, then UPDATE creates a fresh row. CQL (Cassandra Query Language) is a query language for the DataStax Enterprise database. The UPDATE statement updates individual non-key columns in an existing row or upserts a new row. Figure 4-5 shows how each partition is uniquely identified by a partition key, and how the clustering keys are used to uniquely identify the rows within a partition. We'll need both to update our record. Let’s take an example to understand the uuid() function. 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