在HBase 中,创建表时并不能直接为表添加备注。为了实现这一点,我们只能对列族添加备注,并且添加备注是使用createTable方法的参数。以下是示例代码: importorg.apache.hadoop.hbase.TableName;importorg.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;pub
CREATE EXTERNAL HBASE TABLE IF NOT EXISTS table-name element-list1COMMENTstring-constantTBLPROPERTIES(,string-constant1=string-constant2)COLUMN MAPPING(hbase-column-mapping)ADD SALThbase-salt-optionshbase-split-optionsDEFAULT COLUMN FAMILY OPTIONS(hbase-cfamily-opts)COLUMN FAMILY OPTIONS (,hbase-cfam...
行键可以使用post_id + comment_id的组合,这样可以高效地查找和管理评论信息。列族可以包括content(评论内容)和meta(元数据)。content列族存储评论的文本内容,meta列族存储评论的发布时间、点赞数等。 列族 列名 详细说明 content text 评论的文本内容 meta comment_time 评论发布时间 meta likes 评论的...
CREATE [EXTERNAL] TABLE [IF NOT EXISTS] table_name [(col_name data_type [COMMENT col_comment], ...)] [COMMENT table_comment] [PARTITIONED BY (col_name data_type [col_comment], col_name data_type [COMMENT col_comment], ...)] [CLUSTERED BY (col_name, col_name, ...) [SORTED B...
CREATEEXTERNALTABLEods.s10_buyer_calllogs_info_ts( keystring comment"hbase rowkey", buyer_mobile string comment"手机号", contact_mobile string comment"对方手机号", call_date string comment"发生时间", call_type string comment"通话类型",
SELECT owner, COUNT(*) FROM table GROUP BY owner; 求某一列最大值 SELECT MAX(col_name) AS label FROM table; 从多个表中检索信息 SELECT pet.name, comment FROM pet JOIN event ON (pet.name = event.name); 3) Hive的应用场景 Hive并不适合需要低延迟的应用,适合于大数据集的批处理作业: 日志...
create 'blogtable', 'info','text','comment_title','comment_author','comment_text' ===插入概要信息=== put 'blogtable', '1', 'info:title', 'this is doc title' put 'blogtable', '1', 'info:author', 'javabloger' put 'blogtable'...
| [HBASE-24840](https://issues.apache.org/jira/browse/HBASE-24840) | Avoid shows closing region task when create table | Major | monitoring || [HBASE-24628](https://issues.apache.org/jira/browse/HBASE-24628) | Region normalizer now respects a rate limit | Major | Normalizer || [H...
alter table t1$cf1 comment='{"HColumnDescriptor": {"TimeToLive": 3600}}'; 控制最大版本数 和前面TTL类似,通过配置HColumnDescriptor属性。和TTL属性可以同时配置。例如 alter table t1$cf1 comment='{"HColumnDescriptor": {"MaxVersions": 3}}'; ...
DROP TABLE ord_order;-- 创建订单分区表CREATE TABLE ord_order(order_id BIGINT NOT NULL AUTO_INCREMENT COMMENT '订单ID',user_id INT NOT NULL COMMENT '用户ID',goods_id INT NOT NULL COMMENT '商品ID',order_price INT NOT NULL DEFAULT 0 COMMENT '订单实际价格(分)',create_time DATETIME NOT ...