本文介绍了当前仅在PRIMARY KEY的聚集列上支持Order by的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
cassandra2.0.7 cql 3.1.1
cassandra2.0.7 cql 3.1.1
CREATE TABLE playlists (
id uuid,
song_order int,
song_id uuid,
title text,
album text,
artist text,
PRIMARY KEY (id, song_order ) );
INSERT INTO playlists (id, song_order, song_id, title, artist, album)
VALUES (62c36092-82a1-3a00-93d1-46196ee77204, 1,
a3e64f8f-bd44-4f28-b8d9-6938726e34d4, 'La Grange', 'ZZ Top', 'Tres Hombres');
INSERT INTO playlists (id, song_order, song_id, title, artist, album)
VALUES (62c36092-82a1-3a00-93d1-46196ee77204, 2,
8a172618-b121-4136-bb10-f665cfc469eb, 'Moving in Stereo', 'Fu Manchu', 'We Must Obey');
INSERT INTO playlists (id, song_order, song_id, title, artist, album)
VALUES (62c36092-82a1-3a00-93d1-46196ee77204, 3,
2b09185b-fb5a-4734-9b56-49077de9edbf, 'Outside Woman Blues', 'Back Door Slam', 'Roll Away');
SELECT * FROM playlists WHERE id = 62c36092-82a1-3a00-93d1-46196ee77204
ORDER BY song_order DESC LIMIT 2;
error: Order by is currently only supported on the clustered columns
of the PRIMARY KEY, got song_order
此演示来自:
谁可以告诉我为什么?
谢谢!
who can tell me why ?thanks!
推荐答案
在创建表时尝试一下。
CREATE TABLE playlists (
id uuid, song_order int, song_id uuid, title text, album text, artist text,
PRIMARY KEY (id, song_order)) WITH CLUSTERING ORDER BY (song_order ASC);
这篇关于当前仅在PRIMARY KEY的聚集列上支持Order by的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!