comments

Example for count, timestamps, limiting results by partition.

Example for count, timestamps, limiting results by partition.

SOURCE '0_create_keyspace.cql';

// START-drop
DROP TABLE IF EXISTS cycling.comments;
//END-drop

/* Support fast retrieval of first record on each partition
   and show upserts of timestamp type fields */

// START-comments-table
CREATE TABLE IF NOT EXISTS cycling.comments (
  record_id timeuuid,
  id uuid,
  commenter text,
  comment text,
  created_at timestamp,
  PRIMARY KEY (id, created_at)
)
WITH CLUSTERING ORDER BY (created_at DESC);
// END-comments-table

// START-insertall
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), e7ae5cf3-d358-4d99-b900-85902fda9bb0, '2017-02-14 12:43:20-0800', 'Raining too hard should have postponed', 'Alex');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), e7ae5cf3-d358-4d99-b900-85902fda9bb0, '2017-02-14 12:43:20.234-0800', 'Raining too hard should have postponed', 'Alex');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), e7ae5cf3-d358-4d99-b900-85902fda9bb0, '2017-03-21 13:11:09.999-0800', 'Second rest stop was out of water', 'Alex');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), e7ae5cf3-d358-4d99-b900-85902fda9bb0, '2017-04-01 06:33:02.16-0800', 'LATE RIDERS SHOULD NOT DELAY THE START', 'Alex');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), c7fceba0-c141-4207-9494-a29f9809de6f, totimestamp(now()), 'The gift certificate for winning was the best', 'Amy');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), c7fceba0-c141-4207-9494-a29f9809de6f, '2017-02-17 12:43:20.234+0400', 'Glad you ran the race in the rain', 'Amy');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), c7fceba0-c141-4207-9494-a29f9809de6f, '2017-03-22 5:16:59.001+0400', 'Great snacks at all reststops', 'Amy');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), c7fceba0-c141-4207-9494-a29f9809de6f, '2017-04-01 17:43:08.030+0400', 'Last climb was a killer', 'Amy');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), 8566eb59-07df-43b1-a21b-666a3c08c08a, totimestamp(now()), 'Fastest womens time ever way to go amy!', 'Maryanne');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), 8566eb59-07df-43b1-a21b-666a3c08c08a, '2017-02-13 11:20:17.020-0600', 'Great race on a crappy day', 'Maryanne');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), 8566eb59-07df-43b1-a21b-666a3c08c08a, '2017-03-20 15:45:10.101-0600', 'Saggers really rocked it', 'Maryanne');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), 8566eb59-07df-43b1-a21b-666a3c08c08a, '2017-04-14 05:16:52.009-0600', 'Not bad for a flatlander', 'Maryanne');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), fb372533-eb95-4bb4-8685-6ef61e994caa, totimestamp(now()), 'Great course', 'Michael');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), fb372533-eb95-4bb4-8685-6ef61e994caa, '2017-02-15 18:22:11-0800', 'Some entries complain a lot', 'Michael');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), fb372533-eb95-4bb4-8685-6ef61e994caa, '2017-03-16 19:43:01.030-0800', 'Getting read for the race', 'Michael');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), fb372533-eb95-4bb4-8685-6ef61e994caa, '2017-03-22 1:19:44.060-0800', 'Awesome race glad you held it anyway', 'Michael');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), fb372533-eb95-4bb4-8685-6ef61e994caa, '2017-04-07 11:21:14.001-0800', 'Thanks for waiting for me!', 'Michael');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), 9011d3be-d35c-4a8d-83f7-a3c543789ee7, totimestamp(now()), 'Can''t wait for the next race', 'Katarzyna');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), 9011d3be-d35c-4a8d-83f7-a3c543789ee7, '2017-01-01 11:20:17.020-0600', 'Gearing up for the seaon', 'Katarzyna');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), 5b6962dd-3f90-4c93-8f61-eabfa4a803e2, totimestamp(now()), 'Thanks for all your hard work', 'Marianne');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), 220844bf-4860-49d6-9a4b-6b5d3a79cbfb, totimestamp(now()), 'A for effort!', 'Paolo');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), c4b65263-fe58-4846-83e8-f0e1c13d518f, totimestamp(now()), 'Closing ceremony was a little lame', 'Rossella');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), 38ab64b6-26cc-4de9-ab28-c257cf011659, totimestamp(now()), 'Next time guys!', 'Marcia');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), 38ab64b6-26cc-4de9-ab28-c257cf011659, '2017-02-11 22:09:56+0800', 'First race was amazing, can''t wait for more', 'Marcia');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), 6ab09bec-e68e-48d9-a5f8-97e6fb4c9b47, totimestamp(now()), 'So many great races thanks y''all', 'Steven');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), 6ab09bec-e68e-48d9-a5f8-97e6fb4c9b47, '2017-02-02 09:49:00.02+0800', 'Best of luck everybody I can''t make it', 'Steven');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), 6ab09bec-e68e-48d9-a5f8-97e6fb4c9b47, '2017-04-05 12:01:00.003', 'Bike damaged in transit bummer', 'Steven');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), e7cd5752-bc0d-4157-a80f-7523add8dbcd, totimestamp(now()), 'Go team, you rocked it', 'Anna');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), 6d5f1663-89c0-45fc-8cfd-60a373b01622, totimestamp(now()), 'Next year the tour of california!', 'Melissa');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), 95addc4c-459e-4ed7-b4b5-472f19a67995, totimestamp(now()), 'Next year for sure!', 'Vera');
INSERT INTO cycling.comments (record_id, id , created_at , comment, commenter ) values (now(), 95addc4c-459e-4ed7-b4b5-472f19a67995, '2017-02-13 11:40:16.123-0600', 'I can do without the rain@@@@', 'Vera');
// END-insertall

// START-alt
ALTER TABLE cycling.comments 
WITH compression = { 
  'sstable_compression' : 'DeflateCompressor', 
  'chunk_length_kb' : 64
};
// END-alt

// START-cache
ALTER TABLE cycling.comments 
WITH caching = {
  'keys' : 'NONE', 
  'rows_per_partition' : 10
};
// END-cache

// START-nocompact
ALTER TABLE cycling.comments 
WITH COMPACTION = {
  'class' : 'SizeTieredCompactionStrategy', 
  'enabled' : 'false'
};
// END-nocompact

// START-compaction
ALTER TABLE cycling.comments 
WITH COMPACTION = {
  'class' : 'SizeTieredCompactionStrategy', 
  'enabled' : 'true'
};
// END-compaction

Queries against the comment tables

Filter data on the time UUID field.
SOURCE 'comments-table.cql'

// START-removedata
TRUNCATE cycling.comments;
// END-removedata

// START-insert_timeuuid
INSERT INTO cycling.comments (
  record_id,
  id,
  created_at
) VALUES (
  now(),
  e7ae5cf3-d358-4d99-b900-85902fda9bb0,
  '2017-02-14 12:43:20-0800'
);
// END-insert_timeuuid

// START-s_insert_timeuuid
SELECT record_id
FROM cycling.comments
WHERE id = e7ae5cf3-d358-4d99-b900-85902fda9bb0
  AND created_at = '2017-02-14 12:43:20-0800';
// END-s_insert_timeuuid

/* START-rinsert_timeuuid
 record_id
--------------------------------------
 e81aee50-4670-11e7-9fd7-81d397057b18

 (1 rows)
END-rinsert_timeuuid */
Return the most recent records:
SOURCE 'comments-table.cql';

// START-select-mostrecent
SELECT toDate(created_at) AS Date, comment, commenter
FROM cycling.comments
PER PARTITION LIMIT 1;
// END-select-mostrecent
 date       | comment                                       | commenter
------------+-----------------------------------------------+-----------
 2017-04-01 |        LATE RIDERS SHOULD NOT DELAY THE START |      Alex
 2019-09-24 | The gift certificate for winning was the best |       Amy
 2019-09-24 |       Fastest womens time ever way to go amy! |  Maryanne
 2019-09-24 |                                  Great course |   Michael
 2019-09-24 |                  Can't wait for the next race | Katarzyna
 2019-09-24 |                 Thanks for all your hard work |  Marianne
 2019-09-24 |                                 A for effort! |     Paolo
 2019-09-24 |            Closing ceremony was a little lame |  Rossella
 2019-09-24 |                               Next time guys! |    Marcia
 2019-09-24 |              So many great races thanks y'all |    Steven
 2019-09-24 |                        Go team, you rocked it |      Anna
 2019-09-24 |             Next year the tour of california! |   Melissa
 2019-09-24 |                           Next year for sure! |      Vera

(13 rows)
Date and time queries:

          SOURCE 'comments-table.cql'

// START-removedata
TRUNCATE cycling.comments;
// END-removedata

/* CURRENT DATE */

// START-now_date
INSERT INTO cycling.comments (
  id,
  created_at
) VALUES (
  e7ae5cf3-d358-4d99-b900-85902fda9bb0,
  toTimeStamp(toDate(now()))
);
// END-now_date

// START-snow_date
SELECT created_at
FROM cycling.comments
WHERE id = e7ae5cf3-d358-4d99-b900-85902fda9bb0
LIMIT 1;
// END-snow_date

/* START-rnow_date
created_at
---------------------------------
2017-06-01 00:00:00.000000+0000

(1 rows)
END-rnow_date */

/* CURRENT TIMESTAMP */

// START-now_timestamp
INSERT INTO cycling.comments (
  id,
  created_at
) VALUES (
  e7ae5cf3-d358-4d99-b900-85902fda9bb0,
  toTimeStamp(now())
);
// END-now_timestamp

// START-snow_timestamp
SELECT created_at FROM cycling.comments
WHERE id = e7ae5cf3-d358-4d99-b900-85902fda9bb0
LIMIT 1;
// END-snow_timestamp

/* START-rnow_timestamp
created_at
---------------------------------
2017-06-01 03:28:41.526000+0000

(1 rows)
END-rnow_timestamp */

/* DATE without time or zone */

// START-string_date_no_tz
INSERT INTO cycling.comments (
  id,
  created_at
) VALUES (
  e7ae5cf3-d358-4d99-b900-85902fda9bb0,
  '2017-04-01'
);
// END-string_date_no_tz

// START-sstring_date_no_tz
SELECT created_at FROM cycling.comments
WHERE id = e7ae5cf3-d358-4d99-b900-85902fda9bb0
  AND created_at = '2017-04-01';
// END-sstring_date_no_tz

/* START-rstring_date_no_tz
created_at
---------------------------------
2017-04-01 00:00:00.000000+0000

(1 rows)
END-rstring_date_no_tz */

/* DATE WITH TIMEZONE */

// START-string_date_tz
INSERT INTO cycling.comments (
  id,
  created_at
) VALUES (
  e7ae5cf3-d358-4d99-b900-85902fda9bb0,
  '2017-04-01+0000'
);
// END-string_date_tz

// START-sstring_date_tz
SELECT created_at FROM cycling.comments
WHERE id = e7ae5cf3-d358-4d99-b900-85902fda9bb0
  AND created_at = '2017-04-01+0000';
// END-sstring_datetz

/* START-rstring_date_tz
created_at
---------------------------------
2017-04-01 00:00:00.000000+0000

(1 rows)
END-rstring-date_tz */

/* FULL TIMESTAMP */

// START-string_ts
INSERT INTO cycling.comments (
  id,
  created_at
) VALUES (
  e7ae5cf3-d358-4d99-b900-85902fda9bb0,
  '2017-04-01T11:21:59.001+0000'
);
// END-string_ts

// START-sstring_ts
SELECT created_at FROM cycling.comments
WHERE id = e7ae5cf3-d358-4d99-b900-85902fda9bb0
  AND created_at = '2017-04-01T11:21:59.001-0800';
// END-sstring_ts

/* START-rstring_ts
created_at
---------------------------------
2017-04-01 11:21:59.001000-0800
END-rstring_ts */