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