In Cassandra 3.0 and earlier, you can only insert values smaller than 64 kB into a clustering column. To update a counter in a counter table, specify the increment or decrement to the counter column. CQL (Cassandra Query Language) is a query language for the DataStax Enterprise database. While updating rows, if a given row is unavailable, then UPDATE creates a fresh 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. Let’s take an example to understand the uuid() function. I have a table for my products in Cassandra. Cassandra does upsert. So, let's make our page_name column as a composite primary key with the page_id . Command 'Update' is used to update the data in the Cassandra table. CREATE TABLE products ( product_name varchar, seller_name varchar, score int, primary key (product_name, seller_name) ); The partition key columns are the first part of primary key and their role is to spread data evenly around the cluster. 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. ... UPDATE cannot update the values of a row's primary key fields. 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 Data. A PRIMARY KEY consists of a the partition key followed by the clustering columns. The UPDATE statement updates individual non-key columns in an existing row or upserts a new row. 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. In Cassandra, a table can have a number of rows. UPDATE is the command used to update data in a table. In Cassandra, two types of columns have a special role: the partition key columns and the clustering columns. 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.. Insert does not support counter columns use UPDATE instead. Cassandra rejects USING TIMESTAMP or USING TTL … ... UPDATE cannot update the values of a row's primary key fields. 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. 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