See ALTER TABLE for details on altering a table after creation. Cassandra is a partition row store. The first element of the primary key, the partition key, specifies which node…
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Define a new index on a single column of a table. CREATE FUNCTION. Creates custom function that execute user provided code in Cassandra. CREATE KEYSPACE. Define a new keyspace. CREATE…
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CREATE TABLE users ( username text PRIMARY KEY, firstname text, lastname text, birth_year int, country text ); CREATE INDEX ON users(birth_year); The following queries are valid: // All users are…
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Data Definition. CQL stores data in tables, whose schema defines the layout of the data in the table. Tables are located in keyspaces . A keyspace defines options that apply…
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Selecting Keyspace for CassandraTable; Basic Syntax for CreatingCassandraTables; Cassandra Primary Key Types; How to CreateCassandraTable. CreateTable with Simple Primary Key; CreateTable with Compound…
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In the following example, we are creating a table named emp. You have to store the query in a string variable and pass it to the execute() method as shown…
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memtable_flush_period_in_ms Milliseconds before memtables associated with the table are flushed.. Default: 0. min_index_interval Minimum gap between index entries in the index summary. A lower min_index_interval means the index summary contains…
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CREATETABLE t ( id int, k int, v text, PRIMARY KEY (id) ); The partition key is generated from the primary key id for data distribution across the nodes…
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Virtual tables are created in special keyspaces and not just any keyspace. Virtual tables are managed by Cassandra. Users cannot run DDL to create new virtual tables or DML to…
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The Cassandra Query Language (CQL) is very similar to SQL but suited for the JOINless structure of Cassandra. Create a file named data.cql and paste the following CQL script in…
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In Cassandra, a column family works just like a table in RDBMS, thus a column family is created in Cassandra, instead of a table. Syntax 1: CREATE (TABLE | COLUMNFAMILY)…
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