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Quick reference for cql

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Cheat Sheet for Cassandra

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Quick reference for cql

  1. 1. ******************************************************************************** ***************************************************** CASSANDRA BASICS - SHELL COMMANDS ******************************************************************************** ***************************************************** HELP: ==== Displays help topics for all cqlsh commands. Ex: -- HELP -------------------------------------------------------------------------------- ---------------------------------------------------- CAPTURE: ======= Captures the output of a command and adds it to a file. Ex: -- CAPTURE '/home/hadoop/CassandraProgs/Outputfile'; verification: ------------ CAPTURE '/home/hadoop/CassandraProgs/Outputfile'; select * from emp; CAPTURE OFF; -------------------------------------------------------------------------------- ---------------------------------------------------- CONSISTENCY: =========== Shows the current consistency level, or sets a new consistency level. Ex: -- CONSISTENCY -------------------------------------------------------------------------------- ---------------------------------------------------- COPY: ==== Copies data to and from Cassandra. Ex: -- COPY emp (emp_id, emp_city, emp_name, emp_phone, emp_sal) TO ‘myfile‘; -------------------------------------------------------------------------------- ---------------------------------------------------- DESCRIBE: ========= Describes the current cluster of Cassandra and its objects. Ex: -- DESCRIBE CLUSTER; DESCRIBE KEYSPACES; DESCRIBE TABLES; DESCRIBE TABLE emp; DESCRIBE COLUMNFAMILIES; DESCRIBE TYPES; DESCRIBE TYPE card_details; -------------------------------------------------------------------------------- ---------------------------------------------------- EXPAND: ======
  2. 2. Expands the output of a query vertically. Ex -- EXPAND ON EXPAND OFF verificarion: ------------ EXPAND ON select * from emp; EXPAND OFF -------------------------------------------------------------------------------- ---------------------------------------------------- EXIT: ==== Using this command, you can terminate cqlsh. -------------------------------------------------------------------------------- ---------------------------------------------------- PAGING: ====== Enables or disables query paging. -------------------------------------------------------------------------------- ---------------------------------------------------- SHOW: ==== Displays the details of current cqlsh session such as Cassandra version, host, or data type assumptions. Ex: -- SHOW HOST; SHOW VERSION; -------------------------------------------------------------------------------- ---------------------------------------------------- SOURCE: ====== Executes a file that contains CQL statements. Ex: -- SOURCE '/home/hadoop/CassandraProgs/inputfile'; -------------------------------------------------------------------------------- ---------------------------------------------------- TRACING: ======= Enables or disables request tracing. ******************************************************************************** ***************************************************** KEYSPACE OPERATIONS ******************************************************************************** ***************************************************** CREATE KEYSPACE: ====== ======== Creates a KeySpace in Cassandra. USE: === Connects to a created KeySpace. Syntax ------ CREATE KEYSPACE <identifier> WITH <properties>
  3. 3. CREATE KEYSPACE "KeySpace Name" WITH replication = {'class': ‘Strategy name‘, 'replication_factor' : ‘No.Of replicas‘}; CREATE KEYSPACE "KeySpace Name" WITH replication = {'class': ‘Strategy name‘, 'replication_factor' : ‘No.Of replicas‘} AND DURABLE_WRITES = ‘Boolean value‘; USE <identifier> Ex: --- USE tutorialspoint; CREATE KEYSPACE tutorialspoint WITH replication = {'class':'SimpleStrategy', 'replication_factor' : 3}; CREATE KEYSPACE test WITH REPLICATION = { 'class' : 'NetworkTopologyStrategy', 'datacenter1' : 3 } AND DURABLE_WRITES = false; verification: ------------ DESCRIBE KEYSPACES; SELECT * FROM system.schema_keyspaces; -------------------------------------------------------------------------------- ---------------------------------------------------- ALTER KEYSPACE: ===== ======== Changes the properties of a KeySpace. Syntax ------ ALTER KEYSPACE <identifier> WITH <properties> ALTER KEYSPACE "KeySpace Name" WITH REPLICATION = {'class': ‘Strategy name‘, 'replication_factor' : ‘No.Of replicas‘}; ALTER KEYSPACE "KeySpace Name" WITH REPLICATION = {'class': ‘Strategy name‘, 'replication_factor' : ‘No.Of replicas‘} AND DURABLE_WRITES = ‘Boolean value‘; Ex: -- ALTER KEYSPACE tutorialspoint WITH REPLICATION = {'class':'NetworkTopologyStrategy', 'replication_factor' : 3}; ALTER KEYSPACE test WITH REPLICATION = {'class' : 'NetworkTopologyStrategy', 'datacenter1' : 3} AND DURABLE_WRITES = true; verification: ------------ SELECT * FROM system.schema_keyspaces; -------------------------------------------------------------------------------- ---------------------------------------------------- DROP KEYSPACE: ==== ======== Removes a KeySpace Syntax ------ DROP KEYSPACE <identifier> DROP KEYSPACE "KeySpace name" Ex: -- DROP KEYSPACE tutorialspoint; verification: ------------ DESCRIBE KEYSPACES; ******************************************************************************** ***************************************************** TABLE OPERATIONS ********************************************************************************
  4. 4. ***************************************************** CREATE TABLE: ====== ===== Creates a table in a KeySpace. Syntax ------ CREATE (TABLE | COLUMNFAMILY) <tablename> ('<column-definition>' , '<column- definition>') (WITH <option> AND <option>) Ex: -- CREATE TABLE emp( emp_id int PRIMARY KEY, emp_name text, emp_city text, emp_sal varint, emp_phone varint ); verification: ------------ DESCRIBE COLUMNFAMILIES; -------------------------------------------------------------------------------- ---------------------------------------------------- ALTER TABLE: ===== ===== Modifies the column properties of a table. Syntax ------ ALTER (TABLE | COLUMNFAMILY) <tablename> <instruction> ALTER TABLE table name ADD newcolumn datatype; ALTER table name DROP column name; Ex: -- ALTER TABLE emp ADD emp_email text; ALTER TABLE emp DROP emp_email; verification: ------------ DESCRIBE TABLE emp; -------------------------------------------------------------------------------- ---------------------------------------------------- DROP TABLE: ==== ===== Removes a table. Syntax ------ DROP TABLE <tablename> Ex: -- DROP TABLE emp; verification: ------------ DESCRIBE COLUMNFAMILIES; -------------------------------------------------------------------------------- ---------------------------------------------------- TRUNCATE TABLE ======== =====
  5. 5. Removes all the data from a table. Syntax ------ TRUNCATE <tablename> Ex: -- TRUNCATE student; verification: ------------ SELECT * FROM student; -------------------------------------------------------------------------------- ---------------------------------------------------- CREATE INDEX: ====== ===== Defines a new index on a single column of a table. Syntax ------ CREATE INDEX <identifier> ON <tablename> Ex: -- CREATE INDEX name ON emp1 (emp_name); -------------------------------------------------------------------------------- ---------------------------------------------------- DROP INDEX: ==== ===== Deletes a named index. Syntax ------ DROP INDEX <identifier> Ex: -- DROP INDEX name; -------------------------------------------------------------------------------- ---------------------------------------------------- BATCH STATEMENTS: ===== ========== Executes multiple DML statements at once. Syntax ------ BEGIN BATCH <insert-stmt>/ <update-stmt>/ <delete-stmt> APPLY BATCH Ex: -- BEGIN BATCH INSERT INTO emp (emp_id, emp_city, emp_name, emp_phone, emp_sal) values( 4,'Pune','rajeev',9848022331, 30000); UPDATE emp SET emp_sal = 50000 WHERE emp_id =3; DELETE emp_city FROM emp WHERE emp_id = 2; APPLY BATCH; verification: ------------ SELECT * FROM emp; ********************************************************************************
  6. 6. ***************************************************** CRUD OPERATIONS ******************************************************************************** ***************************************************** CREATE DATA: ====== ==== Adds columns for a row in a table. Syntax ------ INSERT INTO <tablename> (<column1 name>, <column2 name>....) VALUES (<value1>, <value2>....) USING <option> Ex: -- INSERT INTO emp (emp_id, emp_name, emp_city, emp_phone, emp_sal) VALUES(1,'ram', 'Hyderabad', 9848022338, 50000); INSERT INTO emp (emp_id, emp_name, emp_city, emp_phone, emp_sal) VALUES(2,'robin', 'Hyderabad', 9848022339, 40000); INSERT INTO emp (emp_id, emp_name, emp_city, emp_phone, emp_sal) VALUES(3,'rahman', 'Chennai', 9848022330, 45000); verification: ------------ SELECT * FROM emp; -------------------------------------------------------------------------------- ---------------------------------------------------- UPDATE DATA ====== ==== Updates a column of a row. Syntax ------ UPDATE <tablename> SET <column name> = <new value> <column name> = <value>.... WHERE <condition> Ex: -- UPDATE emp SET emp_city='Delhi',emp_sal=50000 WHERE emp_id=2; verification: ------------ SELECT * FROM emp; -------------------------------------------------------------------------------- ---------------------------------------------------- READ DATA: ==== ==== This clause reads data from a table. Syntax ------ SELECT FROM <tablename> SELECT FROM <table name> WHERE <condition>; SELECT FROM <table name> WHERE <condition> ORDER BY <column>; Ex: -- SELECT * FROM emp; SELECT emp_name, emp_sal from emp; SELECT * FROM emp WHERE emp_sal=50000; SELECT * FROM emp WHERE emp_sal=50000 ORDER BY sal; -------------------------------------------------------------------------------- ---------------------------------------------------- DELETE DATA:
  7. 7. ====== ==== Deletes data from a table. Syntax ------ DELETE FROM <identifier> WHERE <condition>; Ex: -- DELETE emp_sal FROM emp WHERE emp_id=3; DELETE FROM emp WHERE emp_id=3; verification: ------------ SELECT * FROM emp; ******************************************************************************** ***************************************************** CQL COLLECTION TYPES ******************************************************************************** ***************************************************** List ==== ? the order of the elements is to be maintained, and ? a value is to be stored multiple times. create ------ CREATE TABLE data(name text PRIMARY KEY, email list<text>); inert ----- INSERT INTO data(name, email) VALUES ('ramu', ['abc@gmail.com','cba@yahoo.com']); update ------ UPDATE data SET email = email +['xyz@tutorialspoint.com'] where name = 'ramu'; verifiaction ------------ SELECT * FROM data; -------------------------------------------------------------------------------- ---------------------------------------------------- Set === Set is a data type that is used to store a group of elements. The elements of a set will be returned in a sorted order. create ------ CREATE TABLE data2 (name text PRIMARY KEY, phone set<varint>); insert ------ INSERT INTO data2(name, phone)VALUES ('rahman', {9848022338,9848022339}); update ------ UPDATE data2 SET phone = phone + {9848022330} where name='rahman'; verifiaction ------------ SELECT * FROM data2; --------------------------------------------------------------------------------
  8. 8. ---------------------------------------------------- Map === Map is a data type that is used to store a key-value pair of elements. create ------ CREATE TABLE data3 (name text PRIMARY KEY, address map<timestamp, text>); insert ------ INSERT INTO data3 (name, address) VALUES ('robin', {'home' : 'hyderabad' , 'office' : 'Delhi' } ); update ------ UPDATE data3 SET address = address+{'office':'mumbai'} WHERE name = 'robin'; verifiaction ------------ SELECT * FROM data3; ******************************************************************************** ***************************************************** CQL User-Defined Data Types ******************************************************************************** ***************************************************** CREATE TYPE: ====== ==== Creates a type in a KeySpace. Syntax ------ CREATE TYPE <keyspace name > . <data typename> ( variable1, variable2). Ex: -- CREATE TYPE card_details ( num int, pin int, name text, cvv int, phone set<int> ); verifiaction ------------ DESCRIBE TYPES; -------------------------------------------------------------------------------- ---------------------------------------------------- ALTER TYPE: ===== ==== Modifies the column properties of a type. Syntax ------ ALTER TYPE typename ADD field_name field_type; ALTER TYPE typename RENAME existing_name TO new_name; Ex: -- ALTER TYPE card_details ADD email text; ALTER TYPE card_details RENAME email TO mail; verifiaction
  9. 9. ------------ DESCRIBE TYPE card_details; -------------------------------------------------------------------------------- ---------------------------------------------------- DROP TYPE: ==== ==== Removes a type. Syntax ------ DROP TYPE <typename> Ex: -- DROP TYPE card; verifiaction ------------ DESCRIBE TYPES;
  10. 10. ------------ DESCRIBE TYPE card_details; -------------------------------------------------------------------------------- ---------------------------------------------------- DROP TYPE: ==== ==== Removes a type. Syntax ------ DROP TYPE <typename> Ex: -- DROP TYPE card; verifiaction ------------ DESCRIBE TYPES;

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Cheat Sheet for Cassandra

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