package com.bank.service; import java.io.IOException; import org.apache.hadoop.conf.Configuration;import org.apache.hadoop.conf.Configured;import org.apache.hadoop.fs.Path;import org.apache.hadoop.hbase.HBaseConfiguration;import org.apache.hadoop.hba…

Job端的变化: 通过设置conf,配置输出表,在reduce中获取输出表名字 Configuration conf = job.getConfiguration(); //输出表1 conf.set("usertag_output", "usertag"); //输出表2 conf.set("prodtag_output", "prodtag"); job.setReducerClass(LabelReducer.class…

public class LabelJob { public static void main(String[] args) throws Exception { Job job = Job.getInstance(new Configuration()); job.setJarByClass(LabelJob.class); job.setJobName("Hbase.LabelJob"); Configuration conf = job.getConfiguration(); c…

select count(*) from sysobjects a join syscolumns b on a.id=b.id where a.name='表名' go…

) from syscolumns where id = object_id('tbname') 或者 select * from syscolumns where id = object_id('tbname') 或 SELECT MAX(colid) FROM syscolumns WHERE id=OBJECT_ID('table')…

创建每列随机值的语句 create table TEST_ZHAA01A_03 as select rownum as id, to_char(sysdate + rownum/24/3600, 'yyyy-mm-dd hh24:mi:ss') as inc_datetime, trunc(dbms_random.value(0, 999999999999)) as random_id, dbms_random.string('x', 20) random_string from dual co…

在 Mysql 的 information_schema 库中 COLUMNS 表中存放了所有表的所有列. using MySql.Data.MySqlClient; using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ConsoleApp1 { class Program { static voi…

SELECT COUNT(字段)AS COUNT,字段FROM 表名 GROUP BY 字段 HAVING COUNT >=…

w…

查询指定 数据库 中所有 表 (指定数据库的,所有表) // 可以把 TABLE_NAME 换成 * 号, 查看更丰富的信息 SELECT TABLE_NAME FROM information_schema. TABLES WHERE table_schema = '数据库名' //where 后面还有更多的条件选择,比如只查出以 oauth_表开头的表 AND TABLE_NAME LIKE 'oauth_%'; 查询指定 数据库 中,指定 表 的所有 字段 (指定表的,所有列) SELEC…