All primary key columns and their values must be specified in the WHERE clause to identify a row. Cassandra does upsert. The UPDATE statement updates individual non-key columns in an existing row or upserts a new row. CQL (Cassandra Query Language) is a query language for the DataStax Enterprise database. ... use the UPDATE command. ... UPDATE cannot update the values of a row's primary key fields. I have a table for my products in Cassandra. To update a counter in a counter table, specify the increment or decrement to the counter column. In Cassandra, a table can have a number of rows. So, let's make our page_name column as a composite primary key with the page_id . 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. We'll need both to update our record. 1. 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 Data. Let’s take an example to understand the uuid() function. Command 'Update' is used to update the data in the Cassandra table. CQL (Cassandra Query Language) is a query language for the DataStax Enterprise database. Cassandra also supports an additional construct called a static column, which is for storing data that is not part of the primary key but is shared by every row in a partition. While updating rows, if a given row is unavailable, then UPDATE creates a fresh row. Primary key columns. In Cassandra 3.0 and earlier, you can only insert values smaller than 64 kB into a clustering column. ... UPDATE cannot update the values of a row's primary key fields. The partition key columns are the first part of primary key and their role is to spread data evenly around the cluster. In Cassandra, two types of columns have a special role: the partition key columns and the clustering columns. CREATE TABLE products ( product_name varchar, seller_name varchar, score int, primary key (product_name, seller_name) ); A PRIMARY KEY consists of a the partition key followed by the clustering columns. Each row is referenced by a primary key, also called the row key. To update a counter in a counter table, specify the increment or decrement to the counter column. Cassandra rejects USING TIMESTAMP or USING TTL … 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. Updating Data in a Table. UPDATE is the command used to update data in a table. 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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